Publications

CamNtech Research Library

 

CamNtech products have been trusted by specialist researchers for 25 years. Our research library contains peer reviewed publications citing the use of our devices. Filter by product, application, keyword, author or use free text search to locate your area of interest.

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Test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities

The current study determined the test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities. Before filling in the Adapted-SQUASH twice with a recall period of two weeks, participants wore the Actiheart activity monitor up to one week. For the test-retest reliability (N=68), Intraclass correlation […]

Related Product: Actiheart

Publication Date: September 9, 2020


Determinants of physical activity in young wheelchair-user with spina bifida

Objective: To explore associations between physical activity and peak oxygen uptake (VO2peak), age, sex, and Hoffer classification in young wheelchair-users with spina bifida. Design: Exploratory study. Subjects: Dutch children (age 5-19 years) with spina bifida who use a manual wheelchair. Methods: For the dependent variable physical activity, data from 2 physical activity monitors were analysed: […]

Related Product: Actiheart

Publication Date: August 17, 2020


Active women demonstrate acute autonomic and hemodynamic shifts following exercise in heat and humidity: A pilot study

The purpose of this study was to assess autonomic and hemodynamic recovery in women who performed moderate-intensity exercise in heat. Seven women (31.7 ± 7.6 years, 67.5 ± 4.4 kg, 25.7 ± 5.6% Fat, 43.9 ± 5.1 mL/kg/min) completed two identical bouts of graded treadmill walking (~60% VO2peak). One bout was hot (37.5 ± 1.4°C, […]

Related Product: Actiheart

Publication Date: August 4, 2020


Two weeks of early time-restricted feeding (eTRF) improves skeletal muscle insulin and anabolic sensitivity in healthy men

Background Altering the temporal distribution of energy intake (EI) and introducing periods of intermittent fasting (IF) exert important metabolic effects. Restricting EI to earlier in the day [early time-restricted feeding (eTRF)] is a novel type of IF. Objectives We assessed the chronic effects of eTRF compared with an energy-matched control on whole-body and skeletal muscle […]

Related Product: Actiheart

Publication Date: July 30, 2020


Resting heart rate as a biomarker for tracking change in cardiorespiratory fitness of UK adults: The Fenland Study

Aims Resting heart rate (RHR) is inversely associated with cardiorespiratory fitness (CRF) but few studies have investigated the nature of this relationship in large population samples. We examined the association between RHR and CRF in UK adults and explored factors that may influence this relationship. Methods and Results In a population-based sample of 5,143 men […]

Related Product: Actiheart

Publication Date: July 2, 2020


Sleep deprivation: Cytokine and neuroendocrine effects on perception of effort

Introduction: An increased perception of effort and subjective fatigue are thought to be central to decreased exercise performance observed following disrupted sleep. However, there is limited understanding of the mechanisms which underpin these phenomena. We investigated the role of interleukin-6 (IL-6), the soluble interleukin-6 receptor (sIL-6R)) and neuroendocrine factors (cortisol, adrenaline, noradrenaline and brain derived […]

Related Product: Actiheart

Publication Date: June 17, 2020


Leptin and the Retinal Microvasculature in Young Black and White Adults: The African-PREDICT Study

Background Leptin is a vasoactive peptide that has been linked to diseases associated with macrovascular deterioration. What is still uncertain is its involvement in the microvasculature. Since microvascular changes are presumed to precede macrovascular deterioration, we examined whether measures of the retinal microvasculature are associated with leptin in healthy, young Black and White individuals. Method […]

Related Product: Actiheart

Publication Date: June 13, 2020


Heart rate variability and long chain n-3 PUFA in patients with chronic kidney disease commencing haemodialysis: a cross-sectional study

The risk of sudden cardiac death (SCD) is doubled when a patient with chronic kidney disease (CKD) stage 5 starts haemodialysis. Low heart rate variability (HRV) has been reported to be independently associated with increased risk of SCD and all cardiac death in haemodialysis patients. Long chain n-3 polyunsaturated fatty acids (LC n-3 PUFA; 20:5n-3, […]

Related Product: Actiheart

Publication Date: June 10, 2020


Exploring human trainability: Design and rationale of studies of twin responses to understand exercise as a THerapy (STRUETH) study

Background Exercise confers myriad health benefits and physical inactivity is a modifiable risk factor for many non-communicable chronic diseases. However, individual responsiveness to guideline-based exercise programs is idiosyncratic for health and fitness outcomes. It is not known whether the response of individuals to distinct exercise modalities tend to be concordant or whether there is a […]

Related Product: Actiheart

Publication Date: June 9, 2020


The day-to-day reliability of peak fat oxidation and FATMAX

PURPOSE:Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FATMAX) are often limited by small samples. This study characterised the reliability of PFO and FATMAX in a large cohort of healthy men and women. METHODS:Ninety-nine adults [49 women; age: 35 (11) years; [Formula: see text]O2peak: 42.2 (10.3) mL·kg […]

Related Product: Actiheart

Publication Date: June 1, 2020


Skeletal muscle of females and males with constitutional thinness: a low intramuscular lipid content and oxidative profile

Constitutional thinness (CT) is a non-pathological state of underweight. The present study aimed to explore skeletal muscle energy storage in individuals with constitutional thinness and to further characterize muscle phenotype at baseline and in response to overfeeding. Thirty subjects with CT (15 females, 15 males) and 31 normal-weight control subjects (16 females, 15 males) participated […]

Related Product: Actiheart

Publication Date: June 1, 2020


Blood pressure and nitric oxide synthesis capacity in physically active and inactive groups: the SABPA study

Physical activity affects the vasculature through mechanisms related to nitric oxide bioavailability, oxidative stress, and inflammation; with endothelial function at the centre of this triad. In a South African setting, with the prevalence of hypertension and physical inactivity being alarmingly high, we aimed to investigate relationships of vascular function with markers of oxidative stress, inflammation […]

Related Product: Actiheart

Publication Date: May 7, 2020


Pain intensity and pressure pain thresholds after a light dynamic physical load in patients with chronic neck-shoulder pain

Background: To investigate the development of pain intensity and pressure pain thresholds during and 24 h after a light dynamic physical load among patients with chronic neck-shoulder pain.Methods: Twenty-six patients with chronic neck-shoulder pain and 12 healthy controls were included. The participants arm-cycled on an ergometer. Effort was rated with the Borg Rating of Perceived […]

Related Product: Actiheart

Publication Date: May 1, 2020


Anticipation of 24 h severe energy restriction increases energy intake and reduces physical activity energy expenditure in the prior 24 h, in healthy males

Intermittent fasting involves alternating between severely restricted and unrestricted energy intake. Physical activity energy expenditure (PAEE) is reduced during, and energy intake is elevated after, a period of energy restriction, but whether these are altered in anticipation of energy restriction is unknown. The aim of this study was to assess energy intake and PAEE in […]

Related Product: Actiheart

Publication Date: April 26, 2020


The effects of a 2-year physical activity and dietary intervention on plasma lipid concentrations in children: the PANIC Study

Purpose We studied the effects of a physical activity and dietary intervention on plasma lipids in a general population of children. We also investigated how lifestyle changes contributed to the intervention effects. Methods We carried out a 2-year controlled, non-randomized lifestyle intervention study among 504 mainly prepubertal children aged 6–9 years at baseline. We assigned […]

Related Product: Actiheart

Publication Date: April 24, 2020


Effects of Proximity between Companion Dogs and Their Caregivers on Heart Rate Variability Measures in Older Adults: A Pilot Study

Heart rate variability (HRV) is a noninvasive tool used to evaluate autonomic nervous system function and is affected by age, stress, postural changes, and physical activity. Dog ownership has been associated with higher 24-hr HRV and increased physical activity compared to nonowners. The current pilot study was designed to evaluate the effects of proximity to […]

Related Product: Actiheart

Publication Date: April 13, 2020


Resistance to lean mass gain in constitutional thinness in free‐living conditions is not overpassed by overfeeding

Background Constitutional thinness (CT), a non‐malnourished underweight state with no eating disorders, is characterized by weight gain resistance to high fat diet. Data issued from muscle biopsies suggested blunted anabolic mechanisms in free‐living state. Weight and metabolic responses to protein caloric supplementation has not been yet explored in CT. Methods A 2 week overfeeding (additional […]

Related Product: Actiheart

Publication Date: April 10, 2020


Bidirectional associations of momentary affect with physical activity and sedentary behaviors in working adults

Background Affective experiences and movement-based behaviors form a system that has been shown to influence exercise adherence and mental health outcomes. Little is known about the naturalistic dynamics of the reciprocal associations in this system. Purpose We examined the time intervals at which momentary affect precedes and follows movement-based behaviors in everyday life. Methods A […]

Related Product: Actiheart

Publication Date: April 1, 2020


Differences in psychomotor activity and heart rate variability in patients with newly diagnosed bipolar disorder, unaffected relatives, and healthy individuals

Background Heart rate variability (HRV) and psychomotor activity have been found reduced in bipolar disorder (BD) but has never been investigated in newly diagnosed BD and unaffected relatives. The present study aimed to compare HRV and psychomotor activity between newly diagnosed patients with BD, their unaffected first-degree relatives (UR), and healthy control individuals (HC). Methods […]

Related Product: Actiheart

Publication Date: March 21, 2020


A combination of metabolites predicts adherence to the Mediterranean diet pattern and its associations with insulin sensitivity and lipid homeostasis in the general population: the Fenland Study, United Kingdom

Background Cardiometabolic benefits of the Mediterranean diet have been recognized, but underlying mechanisms are not fully understood. Objectives We aimed to investigate how the Mediterranean diet could influence circulating metabolites and how the metabolites could mediate the associations of the diet with cardiometabolic risk factors. Methods Among 10,806 participants (58.9% women, mean age = 48.4 […]

Related Product: Actiheart

Publication Date: March 1, 2020


Effect of Plain Versus Sugar‐Sweetened Breakfast on Energy Balance and Metabolic Health

Objective This study investigated the effect of 3 weeks of high‐sugar (“Sweet”) versus low‐sugar (“Plain”) breakfast on energy balance, metabolic health, and appetite. Methods A total of 29 healthy adults (22 women) completed this randomized crossover study. Participants had pre‐ and postintervention appetite, health, and body mass outcomes measured, and they recorded diet, appetite (visual […]

Related Product: Actiheart

Publication Date: February 28, 2020


Estimating maximal oxygen consumption from heart rate response to submaximal ramped treadmill test

The Cambridge Ramped Treadmill Test (CRTT) is an incremental, multistage exercise test (I: steady-state walk, II: walk ramped speed, III: walk ramped incline, and IV: run ramped speed on flat). It is typically deployed as a submaximal test with flexible test termination criteria, making it an attractive option for population-based studies of cardiorespiratory fitness. We […]

Related Product: Actiheart

Publication Date: February 20, 2020


Child-related and parental predictors for thelarche in a general population of girls: the PANIC study

Background Obesity has been associated with earlier thelarche, whereas other predictors for it remain unclear. Methods We studied child-related and parental predictors for earlier thelarche in 195 girls aged 6–8 years followed up for 2 years. A physician evaluated breast development by inspection and palpation. Body fat percentage (BF%) was measured by dual-energy X-ray absorptiometry, […]

Related Product: Actiheart

Publication Date: February 20, 2020


Distinct inflammatory mediator patterns in young black and white adults: The African-predict study

Objective Inflammatory mediators have been implicated in the early stages of cardiovascular disease development, including hypertension. Since global reports reflect a higher hypertension prevalence in black than white populations, we hypothesise the involvement of specific inflammatory mediators. We therefore compared a detailed range of 22 inflammatory mediators between young black and white adults, and determined […]

Related Product: Actiheart

Publication Date: February 1, 2020


Retinal-glia ischemia and inflammation induced by chronic stress: The SABPA study

Background Psychobiological processes linking stress and vascular diseases remain poorly understood. The retina and the brain share a common embryonic-diencephalon origin and blood-barrier physiology e.g. ongoing ischemia facilitates S100B release with astrocytic activity and glial-fibrillary-acidic-protein expression (GFAP). However, GFAP decreases revealed astrocyte pathology in the prefrontal cortex of depression/suicide cases; and might be a key […]

Related Product: Actiheart

Publication Date: February 1, 2020


Fatty fish intervention and psychophysiological responses to mental workload in forensic inpatients: A randomized control trial

The overall aim of this randomized controlled trial was to investigate the effect of a long-term fatty fish intervention during winter time on psychophysiological responses, that is, heart rate variability (HRV), to mental workload. Forty-seven forensic inpatients were randomly assigned into a fish group (FG) or a control group (CG). HRV responses to an experimental […]

Related Product: Actiheart

Publication Date: February 1, 2020


Lipid metabolism links nutrient-exercise timing to insulin sensitivity in men classified as overweight or obese

Context Pre-exercise nutrient availability alters acute metabolic responses to exercise, which could modulate training responsiveness. Objective To assess acute and chronic effects of exercise performed before versus after nutrient ingestion on whole-body and intramuscular lipid utilization and postprandial glucose metabolism. Design (1) Acute, randomized, crossover design (Acute Study); (2) 6-week, randomized, controlled design (Training Study). […]

Related Product: Actiheart

Publication Date: January 30, 2020


Champ4life Study Protocol: A One-Year Randomized Controlled Trial of a Lifestyle Intervention for Inactive Former Elite Athletes with Overweight/Obesity

Preventive and educational programs directed to former elite athletes in the areas of healthy living are required. This is particularly relevant as obesity and health-related problems are observed in retired athletes, especially in those whose current levels of physical activity are below the recommendations. During their sports career, elite athletes are supported by a multidisciplinary […]

Related Product: Actiheart

Publication Date: January 21, 2020


The effect of clinical simulation assessment on stress and anxiety measures in emergency care students

Background Clinical simulation has become widespread as a training and assessment tool across a range of health professions, including emergency care. As with any form of assessment, simulations may be associated with stress and anxiety (“distress”) which may have a negative effect on student performance if demands required by the simulation outweigh the available resources. […]

Related Product: Actiheart

Publication Date: January 7, 2020


Do adolescents with cerebral palsy meet recommendations for healthy weight and physical activity behaviours?.

Purpose: Describe physical activity energy expenditure, body composition, and nutritional intake in adolescents with cerebral palsy (CP) in the context of health recommendations. Materials and methods: A cross-sectional study of 12 adolescents, aged 12–19 years, with CP, classified as Gross Motor Function Classification System levels II–V. Actiheart® accelerometry assessed daily physical activity energy expenditure; Dual […]

Related Product: Actiheart

Publication Date: January 1, 2020


Metabolic rate and muscle activation level when wearing state-of-the-art cold-weather protective clothing during level and inclined walking

Use of cold-weather personal protective clothing (PPC) in cold climates is essential but can add metabolic cost to the wearer. This study measured the effect of wearing state-of-the-art PPC and personal protective equipment (PPE), with the possible effect of clothing layers and fit, on physiological responses including metabolic rate (MR) and muscle activation level. 19 […]

Related Product: Actiheart

Publication Date: January 1, 2020


Effects of Non-neutral Posture and Anthropometry on Heart Rate in Hand Tools Tasks

The use of hand tools in industry is one of the many risky issues for musculoskeletal disorders. Working postures during handling tools assumed may be reiterated several times a day, every day for several years and can be predicted to affect the musculature of the workers. Using physiological demands to assess coordinated posture and anthropometry […]

Related Product: Actiheart

Publication Date: January 1, 2020


Daily running exercise may induce incomplete energy intake compensation: a 7-day crossover trial

Understanding daily exercise effects on energy balance is important. This study examined the effects of 7 days of imposed exercise (EX) and no exercise (N-EX) on free-living energy intake (EI) and physical activity energy expenditure (PAEE) in 9 men. Free-living EI was higher in EX compared with N-EX. Total and vigorous PAEE were higher, with […]

Related Product: Actiheart

Publication Date: January 1, 2020


Dietary Patterns Are Associated with Serum Metabolite Patterns and Their Association Is Influenced by Gut Bacteria among Older German Adults

Background Although dietary intakes and dietary intake patterns (DPs) have been associated with single metabolites, it is unclear whether DPs are also reflected in specific metabolite patterns (MPs). Moreover, the influence of groups of gut bacteria on the relationship between DPs and MPs is underexplored. Objectives We aimed to investigate the association of DPs and […]

Related Product: Actiheart

Publication Date: January 1, 2020


Physical activity in rheumatoid arthritis: relationship to cardiovascular risk factors, subclinical atherosclerosis, and disease activity

Objective: To investigate associations between physical activity and risk factors for cardiovascular disease (CVD), subclinical atherosclerosis, and disease activity in patients with early and long-standing rheumatoid arthritis (RA). Method: This cross-sectional study included 84 patients with early and 37 with long-standing RA (disease duration, mean ± sd: 1.4 ± 0.4 and 16.3 ± 2.3 years, […]

Related Product: Actiheart

Publication Date: January 1, 2020


Fundamental Movement Skill Approach to Combat Childhood Obesity in Surabaya, Indonesia: Potential Effects of Video Games Based Exercises (Exergaming)

The study aims to observe the effect of moderate intensity exergaming on mastering of fundamental movement skill and reduction in body mass index (BMI) in overweight and obese children in Surabaya, Indonesia. The participants were 17 primary school students, aged 6-12 years. All participants had a BMI above percentile 85 (overweight and obese) and performed […]

Related Product: Actiheart

Publication Date: January 1, 2020


Health promotion and cardiovascular risk reduction in people with spinal cord injury: physical activity, healthy diet and maintenance after discharge—protocol for a prospective national cohort study and a preintervention-postintervention study

ntroduction Spinal cord injury (SCI) predisposes those who suffer from it to physical inactivity and weight gain; consequently, death due to cardiovascular diseases is more frequent among people with SCI than in the general population. The literature documents a consensus about an interdisciplinary multimodal approach for the prevention and treatment of cardiovascular risk factors including […]

Related Product: Actiheart

Publication Date: December 31, 2019


Effects of a 12-Week Exercise Intervention on Subsequent Compensatory Behaviors in Adolescent Girls: An Exploratory Study

Purpose: Chronic exercise programs can induce adaptive compensatory behavioral responses through increased energy intake (EI) and/or decreased free-living physical activity in adults. These responses can negate the benefits of an exercise-induced energy deficit; however, it is unclear whether young people experience similar responses. This study examined whether exercise-induced compensation occurs in adolescent girls. Methods: Twenty-three […]

Related Product: Actiheart

Publication Date: December 1, 2019


Habitual physical activity is associated with lower fasting and greater glucose-induced GLP-1 response in men

Rationale The hormone glucagon-like peptide-1 (GLP-1) decreases blood glucose and appetite. Greater physical activity (PA) is associated with lower incidence of type 2 diabetes. While acute exercise may increase glucose-induced response of GLP-1, it is unknown how habitual PA affects GLP-1 secretion. We hypothesised that habitual PA associates with greater glucose-induced GLP-1 responses in overweight […]

Related Product: Actiheart

Publication Date: December 1, 2019


Hydration status affects thirst and salt preference but not energy intake or postprandial ghrelin in healthy adults: A randomised crossover trial

Background Few studies have investigated the effect of hydration status on appetite for food in healthy adults. Prior work suggests hydration status does not alter appetite or energy intake, with mixed findings regarding appetite hormone secretion. However, an extensive investigation into both the psychological and physiological appetitive responses to hydration status has never been conducted. […]

Related Product: Actiheart

Publication Date: December 1, 2019


Quality of life, physical activity and cardiorespiratory fitness in black African women: B-Healthy project

Purpose To study the associations between physical activity (PA), cardiorespiratory fitness (CRF), and health-related quality of life (HRQoL) in black African women from a low socioeconomic community in South Africa. Methods Black African women (n = 146) aged 35–75 years from a low socioeconomic community in South Africa participated in this study. We measured PA levels via […]

Related Product: Actiheart

Publication Date: November 26, 2019


Electrically assisted cycling for individuals with type 2 diabetes mellitus: protocol for a pilot randomized controlled trial

Background The global incidence of type 2 diabetes mellitus (T2DM) is increasing. Given the many complications associated with T2DM, effective management of the disease is crucial. Physical activity is considered to be a key component of T2DM management. However, people with T2DM are generally less physically active than individuals without T2DM and adherence to physical […]

Related Product: Actiheart

Publication Date: November 23, 2019


Assessment of energy expenditure during high intensity cycling and running using a heart rate and activity monitor in young active adults

Objective Although high intensity physical activities may represent a great proportion of the total energy expenditure in active people, only sparse studies have investigated the accuracy of wearable monitors to assess activity related energy expenditure (AEE) during high intensity exercises. Therefore, the purpose of the present study was to investigate the accuracy of the Actiheart, […]

Related Product: Actiheart

Publication Date: November 7, 2019


Companion dog foster caregiver program for older veterans at the VA Maryland Health Care System: a feasibility study

Veterans experience mental health conditions at a disproportionate rate compared to their civilian counterparts, and approximately 60% of older veterans who receive their care through the United States Department of Veterans Affairs (VA) do not meet physical activity (PA) recommendations. We tested the Veterans as Foster Ambassadors program at the VA Maryland Health Care System […]

Related Product: Actiheart

Publication Date: November 4, 2019


How many calories do nurses burn at work? A real-time study of nurses’ energy expenditure

Background Nurses have high rates of overweight and obesity, and physical inactivity is one key determinant of weight gain. Aims The present study aims to quantify nurses’ energy expenditure over a standard 12-hour shift to establish whether activity levels at work are too low to maintain a healthy body weight. Methods Ward-based nurses (n = 96, 90 […]

Related Product: Actiheart

Publication Date: November 1, 2019


The accumulation of deficits approach to describe frailty

The advancing age of the participants of the European Prospective Investigation into Cancer and Nutrition (EPIC)—Potsdam study was the incentive to investigate frailty as a major parameter of ageing. The aim of this study was to develop a multidimensional tool to measure frailty in an ageing, free-living study population. The “accumulation of deficits approach” was […]

Related Product: Actiheart

Publication Date: October 15, 2019


Association of Total Daily Physical Activity and Fragmented Physical Activity With Mortality in Older Adults

Importance Fragmented daily physical activity may be a sign of physiological decline that provides more powerful insight into impending mortality than total daily activity. Objective To compare and contrast the association between total daily activity and activity fragmentation, which encompasses activity bouts and duration, and mortality risk. Design, Setting, and Participants In this cohort study, […]

Related Product: Actiheart

Publication Date: October 2, 2019


An Indoor Therapeutic Garden for Behavioral Symptoms in Alzheimer’s Disease: A Randomized Controlled Trial

Background: Behavioral and psychological symptoms of dementia (BPSD) affect 60-90% of patients with Alzheimer’s disease (AD). Objective: To determine if environmental therapy is an effective strategy to reduce BPSD, we tested 163 patients with AD with Neuropsychiatric Inventory (NPI) before and after 6 months of an indoor therapeutic garden (TG) or standard environment. Methods: A […]

Related Product: Actiheart

Publication Date: October 1, 2019


Associations between occupational relative aerobic workload and resting blood pressure among different age groups: a cross-sectional analysis in the DPhacto study

Objective High levels of occupational physical activity (OPA) increase heart rate, blood pressure (BP) and the risk of hypertension. Older workers may be more vulnerable to high levels of OPA due to age-related degeneration of the cardiovascular system and cardiorespiratory fitness. This study investigates the association of relative aerobic workload (RAW) with resting BP and […]

Related Product: Actiheart

Publication Date: September 24, 2019


Associations of physical activity, sedentary time, and cardiorespiratory fitness with heart rate variability in 6-to 9-year-old children: the PANIC study

Purpose To study the associations of physical activity (PA), sedentary time (ST), and cardiorespiratory fitness (CRF) with heart rate variability (HRV) in children. Methods The participants were a population sample of 377 children aged 6–9 years (49% boys). ST, light PA (LPA), moderate PA (MPA), vigorous PA (VPA), and moderate-to-vigorous PA (MVPA), and PA energy […]

Related Product: Actiheart

Publication Date: September 18, 2019


Longitudinal changes in energy balance during pregnancy in South African women from the Tlokwe Municipal area

Background Energy balance in the era of obesity, contributes to challenges in healthy weight maintenance. The study aims to determine the changes in energy intake and expenditure from the first to the third trimester of pregnancy in women from the Tlokwe Municipal area.Methods We followed a longitudinal observational design to measure healthy pregnant women in […]

Related Product: Actiheart

Publication Date: September 16, 2019


Association of social jetlag with sleep quality and autonomic cardiac control during sleep in young healthy men

Social jetlag (SJL), the difference in sleep timing between work and free days is a consequence of the discrepancy between the individual’s circadian rhythm and the social clock. SJL is considered a chronic stress factor and has been linked to various health problems. In this field study, we examined for the first time the association […]

Related Product: Actiheart

Publication Date: September 6, 2019


The effects of a single night of complete and partial sleep deprivation on physical and cognitive performance: A Bayesian analysis

This study investigated the effects of complete and partial sleep deprivation on multiple aspects of athletic performance. Ten males completed a cognitive function test, maximal handgrip strength, countermovement jump (CMJ) and a 15 min all out cycling test to assess aerobic performance. These tests were performed following 3 different sleep conditions; normal sleep (CON), a […]

Related Product: Actiheart

Publication Date: September 5, 2019


Physical activity and sedentary behaviour in children with spina bifida

Aim To describe active and sedentary time in children with spina bifida and to compare their physical activity on weekdays versus weekends. Method In this exploratory cross‐sectional study, data from 13 Canadian and 22 Dutch children with spina bifida (14 females, 21 males; mean age 10y 11mo, standard deviation [SD] 3y 6mo, range 5y 6mo–18y; […]

Related Product: Actiheart

Publication Date: August 30, 2019


Effects of eight weeks traditional archery training on heart rate variability among sedentary youth

Heart rate variability (HRV) provides information of cardiac autonomic control which indicates the interaction of sympathetic and parasympathetic nervous system. The purpose of this study was to investigate the effects of eight weeks traditional archery training on heart rate variability among sedentary lifestyle youth. Thirty-four inactive male (performed <150 minutes moderate to vigorous physical activity […]

Related Product: Actiheart

Publication Date: August 21, 2019


The Effects of an Adapted Community Sports Camp (“GAME ON”) on Functional Mobility, and Fitness in Children and Adolescents With Cerebral Palsy (CP)

Our interdisciplinary team has developed a community-based camp “GAME ON” that actively engages children and adolescents with CP in learning new motor skills and improving their functional mobility and fitness. We emphasize the activities used in the camp and the outcome measures to monitor participants’ progress. We present the results from a feasibility study that […]

Related Product: Actiheart

Publication Date: August 1, 2019


Physical Activity for Symptom Management in Women With Metastatic Breast Cancer: A Randomized Feasibility Trial on Physical Activity and Breast Metastases

Context Physical activity for women with early-stage breast cancer is well recognized for managing cancer-related symptoms and improving quality of life. While typically excluded from interventions, women with metastatic breast cancer may also benefit from physical activity. Objective To 1) determine the safety and feasibility of a physical activity program for women with metastatic breast […]

Related Product: Actiheart

Publication Date: July 30, 2019


Combined GLP-1, oxyntomodulin, and peptide YY improves body weight and glycemia in obesity and prediabetes/type 2 diabetes: a randomized, single-blinded, placebo-controlled study

OBJECTIVE Roux-en-Y gastric bypass (RYGB) augments postprandial secretion of glucagon-like peptide 1 (GLP-1), oxyntomodulin (OXM), and peptide YY (PYY). Subcutaneous infusion of these hormones (“GOP”), mimicking postprandial levels, reduces energy intake. Our objective was to study the effects of GOP on glycemia and body weight when given for 4 weeks to patients with diabetes and […]

Related Product: Actiheart

Publication Date: July 27, 2019


Associations of types of dairy consumption with adiposity: cross-sectional findings from over 12 000 adults in the Fenland Study

Evidence from randomised controlled trials supports beneficial effects of total dairy products on body weight, fat and lean mass, but evidence on associations of dairy types with distributions of body fat and lean mass is limited. We aimed to investigate associations of total and different types of dairy products with markers of adiposity, and body […]

Related Product: Actiheart

Publication Date: July 25, 2019


Physical Activity Is Higher in Patients with LVADs Compared to Chronic Heart Failure

PURPOSE:Left ventricular assist devices (LVADs) are associated with an increased aerobic capacity in patients with chronic heart failure (CHF). However, studies evaluating the impact of LVAD implantation on physical activity (PA) are lacking. The aim of this study was to compare daily PA levels in participants with LVADs with well-matched CHF participants. METHODS:Sixteen participants with […]

Related Product: Actiheart

Publication Date: July 24, 2019


Association between chronotype and body mass index: The role of C-reactive protein and the cortisol response to stress

Background : Chronotype influences several physiological systems, including the immune system and the hypothalamus-pituitary-adrenal (HPA)-axis. Previous research has shown that evening chronotype is associated with adverse metabolic health outcomes and obesity. However, the exact mechanisms underlying the observed differences in metabolic function between “morning” and “evening” types remain to be explored. Objective : To investigate […]

Related Product: Actiheart

Publication Date: July 24, 2019


Influence of fish oil-derived n-3 fatty acid supplementation on changes in body composition and muscle strength during short-term weight loss in resistance-trained men

Background: A detrimental consequence of diet-induced weight loss, common in athletes who participate in weight cutting sports, is muscle loss. Dietary omega-3 polyunsaturated fatty acids (n-3PUFA) exhibit a protective effect on the loss of muscle tissue during catabolic situations such as injury-simulated leg immobilization. This study aimed to investigate the influence of dietary n-3PUFA supplementation […]

Related Product: Actiheart

Publication Date: July 16, 2019


Vascular Structure and Inflammation in a South African Population: The SABPA Study

Background and Objective: Inflammation plays a role in the early onset of cardiovascular disease. However, longitudinal studies on this topic, especially in South African populations, are scant. We explored whether early changes in vascular structure are associated with changes in inflammation. Methods: We investigated 303 South African teachers aged 20–65 years at two intervals, three […]

Related Product: Actiheart

Publication Date: July 10, 2019


Heart Rate Variability and Academic Performance of First-Year University Students

Background: Heart rate variability (HRV) measures have been shown to be positively associated with cognitive processing, while a positive association between cognitive processing and academic performance has been demonstrated. Objectives: To determine whether resting HRV or HRV marker response to either a cognitive or an orthostatic challenge is significantly associated with a first-year university student’s […]

Related Product: Actiheart

Publication Date: July 2, 2019


Variation in gravimetric correction factors for nephelometer-derived estimates of personal exposure to PM2. 5

Many portable monitors for quantifying mass concentrations of particulate matter air pollution rely on aerosol light scattering as the measurement method; however, the relationship between scattered light (what is measured) and aerosol mass concentration (the metric of interest) is a complex function of the refractive index, size distribution, and shape of the particles. In this […]

Related Product: Actiheart

Publication Date: July 1, 2019


Objectively assessed physical activity and weight status of primary school children in Germany with and without migration backgrounds. Public health

Objectives Many children are insufficiently active, and children with a migration background appear to be even less active and at a higher risk of developing obesity. This study evaluated the weight status, and the frequencies and intensities of objectively assessed physical activity (PA) of children with and without a migration background. Study design Cross-sectional study. […]

Related Product: Actiheart

Publication Date: June 27, 2019


Parental gentle encouragement promotes shy toddlers’ regulation in social contexts

Gentle encouragement to approach appears to reduce risk for anxiety and is commonly incorporated into parenting interventions for inhibited preschoolers, yet little is known regarding whether gentle encouragement facilitates in-the-moment regulation as shy or inhibited children face social novelty, particularly during the toddler period. The current study used a sample of 55 temperamentally shy toddlers […]

Related Product: Actiheart

Publication Date: June 13, 2019


Is high aerobic workload at work associated with leisure time physical activity and sedentary behaviour among blue-collar workers? A compositional data analysis based on accelerometer data.

Objective: This study aimed to investigate the hypothesized negative association between duration of work time spent at a high relative aerobic workload and leisure time movement behaviours among blue-collar workers. Methods: This was a cross-sectional study based on heart rate and accelerometer data from 803 blue-collar workers (447 men and 356 women). Relative aerobic workload […]

Related Product: Actiheart

Publication Date: June 6, 2019


Why does work cause fatigue? A real-time investigation of fatigue, and determinants of fatigue in nurses working 12-hour shifts

Background One of the striking regularities of human behavior is that a prolonged physical, cognitive, or emotional activity leads to feelings of fatigue. Fatigue could be due to (1) depletion of a finite resource of physical and/or psychological energy or (2) changes in motivation, attention, and goal-directed effort (e.g. motivational control theory). Purpose To contrast […]

Related Product: Actiheart

Publication Date: June 1, 2019


Everyday stress components and physical activity: examining reactivity, recovery and pileup

The experience of naturally-occurring stress in daily life has been linked with lower physical activity levels. However, most of this evidence comes from general and static reports of stress. Less is known how different temporal components of everyday stress interfere with physical activity. In a coordinated secondary analysis of data from two studies of adults, […]

Related Product: Actiheart

Publication Date: May 28, 2019


Habitual physical activity pattern and its association with gender and body composition in healthy adults

An appropriate level of physical activity (PA) is beneficial for health and weight management. This study examines the relationship of habitual PA and activity energy expenditure (AEE) in a typical week with gender and body composition parameters. Data of habitual PA of 72 healthy adults were collected with the heart rate and motion sensor (Actiheart). […]

Related Product: Actiheart

Publication Date: May 25, 2019


Moderate‐to‐Vigorous Physical Activity Is Associated With Higher Muscle Oxidative Capacity in Older Adults

BACKGROUND Age‐related decline in muscle oxidative capacity reduces muscle function and physical performance, leading to disability and frailty. Whether age‐related decline in oxidative capacity is modified by exercise and other lifestyle practices is unclear. Therefore, we tested the hypothesis that physical activity is associated with better oxidative capacity, independent of age. DESIGN Cross‐sectional study performed […]

Related Product: Actiheart

Publication Date: May 22, 2019


High sedentary time in children is not only due to screen media use: a cross-sectional study

Background Sedentary behaviour has become a growing public health concern. Currently, it is a common belief that screen time (SCT) is a key factor in high overall sedentary time (ST) and is often used as a primary outcome. However, the evidence is lacking. Therefore, this study investigated the association of objectively assessed total ST with […]

Related Product: Actiheart

Publication Date: May 16, 2019


The Efficacy of Respiratory Regulation on Parasympathetic Nervous System Appraised by Heart Rate Variability

Purpose Stress and sleep deprivation are caused by the imbalance of autonomic nervous system, especially in low activity of parasympathetic nervous system (PNS), which affect daily living and impact economics severely. Since the PNS restores and conserves body and in response to stimulations. Moreover, voluntary control of respiratory rhythm, known as respiratory regulation, is considered […]

Related Product: Actiheart

Publication Date: May 14, 2019


Validity of commonly used heart rate variability markers of autonomic nervous system function

Background: Despite strong reservations regarding the validity of a number of heart rate variability (HRV) measures, these are still being used in recent studies. Aims: We aimed to compare the reactivity of ostensible sympathetic HRV markers (low and very low frequency [LF and VLF]) to that of electrodermal activity (EDA), an exclusively sympathetic marker, in […]

Related Product: Actiheart

Publication Date: May 1, 2019


Maximum acceptable frequency of lift for combined manual material handling task in Malaysia

Background Extensive studies have been carried out over the years to determine the maximum acceptable weight that a worker is capable of lifting in a given situation among Occidental populations across Europe and US. Nonetheless, studies that place emphasis on using lifting frequency as the quantifying task parameter, especially in developing countries such as Malaysia, […]

Related Product: Actiheart

Publication Date: April 29, 2019


Daytime melatonin and light independently affect human alertness and body temperature

Light significantly improves alertness during the night (Cajochen, Sleep Med Rev , 11, 2007 and 453; Ruger et al., AJP Regul Integr Comp Physiol , 290, 2005 and R1413), but results are less conclusive at daytime (Lok et al., J Biol Rhythms , 33, 2018 and 589). Melatonin and core body temperature levels at those […]

Related Product: Actiheart

Publication Date: April 29, 2019


The test-retest reliability and criterion validity of the Sensewear mini and Actiheart in two climatologically different countries

Note: Bodymedia was sold in 2014 to Jawbone who subsequently went into liquidation in 2017 – the sensewear armband is hence obsolete. Different environments might influence energy expenditure (EE) from physical activity (PA) monitors. We evaluated and compared the test-retest reliability and criterion validity of the Sensewear mini (SWAmini) and Actiheart (AH) to estimate EE […]

Related Product: Actiheart

Publication Date: April 27, 2019


Skipping breakfast before exercise creates a more negative 24-hour energy balance: A randomized controlled trial in healthy physically active young men

Background At rest, omission of breakfast lowers daily energy intake, but also lowers energy expenditure, attenuating any effect on energy balance. The effect of breakfast omission on energy balance when exercise is prescribed is unclear. Objectives The aim of this study was to assess the effect on 24-h energy balance of omitting compared with consuming […]

Related Product: Actiheart

Publication Date: April 10, 2019


Active-to-sedentary behavior transitions, fatigability, and physical functioning in older adults

Background With aging, daily physical activity (PA) becomes less frequent and more fragmented. Accumulation patterns of daily PA—including transitions from active-to-sedentary behaviors—may provide important insights into functional status in older, less active populations. Methods Participants of the Baltimore Longitudinal Study of Aging (n = 680, 50% male, aged 27–94 years) completed a clinical assessment and […]

Related Product: Actiheart

Publication Date: April 4, 2019


Comparison of Heart Rate Variability among Young Malay Male Adult with Different BMI and Level of Adiposity

INTRODUCTION: Subclinical changes that occur in the heart at an early age may provide valuable information to outline prevention strategies for cardiovascular diseases. Heart rate variability (HRV) reflects regulation of autonomic balance, heart, and vascular tone, which are the determinants of blood pressure. Therefore, this study aimed to determine the difference in heart rate variability […]

Related Product: Actiheart

Publication Date: April 1, 2019


Physical Fitness and Psychological Hardiness as Predictors of Parasympathetic Control in Response to Stress: a Norwegian Police Simulator Training Study

The individual biopsychological response to a specific stressor is the result of a complex interplay between many different factors including physiology, behavior, and personality. The goal of the present study was to explore the potential link between physical fitness, hardiness (Kobasa 1979), and the individual autonomic stress arousal experienced during a stressful police training situation […]

Related Product: Actiheart

Publication Date: March 25, 2019


Validity of the Actiheart step test for the estimation of maximum oxygen consumption in endurance athletes and healthy controls.

Submaximal step tests are often used for estimation of maximum oxygen consumption (VO2max) in humans. The validity of the Actiheart step test for VO2 max estimation was not fully studied yet. Therefore, purpose of the study was to estimate VO2 max using the Actiheart step test and to compare the data with measured VO2 max […]

Related Product: Actiheart

Publication Date: March 12, 2019


Cross-sectional associations of objectively assessed sleep duration with physical activity, BMI and television viewing in German primary school children

Background The global incidence of overweight and obesity has increased dramatically among children and adolescents over the past decades. Insufficient sleep duration and physical inactivity are known risk factors for overweight and obesity in children. To engage children in a healthier lifestyle knowledge about associations of sleep duration and behavioural aspects in children are vital. […]

Related Product: Actiheart

Publication Date: March 11, 2019


Shy toddlers act bold: The roles of respiratory sinus arrhythmia and parent emotion language

Shy children show reticence in social contexts, presumably as a way of regulating their fear. The present study evaluated whether toddler physiological regulation and parent emotion language facilitated shy toddlers’ (21–24 months) engagement with an unfamiliar female examiner. Toddler high basal respiratory sinus arrhythmia was positively associated with bold approach with the examiner. Parent emotion […]

Related Product: Actiheart

Publication Date: March 9, 2019


Meal analysis for understanding eating behavior: meal-and participant-specific predictors for the variance in energy and macronutrient intake

Background Meals differ in their nutritional content. This variation has not been fully addressed despite its potential contribution in understanding eating behavior. The aim of this study was to investigate the between-meal and between-individual variance in energy and macronutrient intake as a measure of variation in intake and the meal type-specific relative importance of predictors […]

Related Product: Actiheart

Publication Date: March 7, 2019


Putting the flight in “fight-or-flight”: Testosterone reactivity to skydiving is modulated by autonomic activation

Sensation-seeking (SS) involves the tendency to pursue exciting activities, potentially including risky behaviors (e.g., substance use, risky sexual behavior). Testosterone is associated with cortisol, SS, and autonomic nervous system (ANS) functioning. Testosterone reactivity/recovery during sky-diving and its relationship to cortisol response, ANS response and SS were examined. Forty-four participants provided reactive saliva samples and autonomic […]

Related Product: Actiheart

Publication Date: March 2, 2019


Adults with congenital heart disease overestimate their physical activity level

Background Physical activity reduces the risk of acquired cardiovascular disease, which is of great importance in patients with congenital heart disease (CHD). There are diverging data whether physical activity level (PAL) differs between patients with CHD and controls. Furthermore, it is unknown if PAL can be reliably assessed in patients with CHD using self-reported instruments. […]

Related Product: Actiheart

Publication Date: March 1, 2019


Impact of sit-stand desks at work on energy expenditure, sitting time and cardio-metabolic risk factors: Multiphase feasibility study with randomised controlled component

Uncertainties remain about the overall effect of sit-stand desks for reducing prolonged sitting among office-based workers. This study assessed the feasibility of a randomised controlled trial of the impact of workplace sit-stand desks on overall energy expenditure, sitting time and cardio-metabolic outcomes. It involved four phases: Phase I: online survey; Phase II: workspace auditing; Phase […]

Related Product: Actiheart

Publication Date: March 1, 2019


Energy status and body composition across a collegiate women’s lacrosse season

Little data is available regarding the energy and nutritional status of female collegiate team sport athletes. Twenty female NCAA Division II lacrosse athletes (mean ± SD: 20.4 ± 1.8 years; 68.8 ± 8.9 kg; 168.4 ± 6.6 cm; 27.9 ± 3% body fat) recorded dietary intake and wore a physical activity monitor over four consecutive […]

Related Product: Actiheart

Publication Date: February 23, 2019


Objectively measured sitting and standing in workers: Cross-sectional relationship with autonomic cardiac modulation

Excessive sitting and standing are proposed risk factors for cardiovascular diseases (CVDs), possibly due to autonomic imbalance. This study examines the association of objectively measured sitting and standing with nocturnal autonomic cardiac modulation. The cross-sectional study examined 490 blue-collar workers in three Danish occupational sectors. Sitting and standing during work and leisure were assessed during […]

Related Product: Actiheart

Publication Date: February 22, 2019


Comparison of conventional and individualized 1-MET values for expressing maximum aerobic metabolic rate and habitual activity related energy expenditure

The maximum aerobic metabolic rate can be expressed in multiple metabolically equivalent tasks (MET), i.e., METmax. The purpose was to quantify the error when the conventional (3.5 mL∙kg−1∙min−1) compared to an individualized 1-MET-value is used for calculating METmax and estimating activity energy expenditure (AEE) in endurance-trained athletes (END) and active healthy controls (CON). The resting […]

Related Product: Actiheart

Publication Date: February 22, 2019


Effect of acute hypohydration on glycemic regulation in healthy adults: A randomized crossover trial

Abstract The aim of this study was to investigate the acute effect of hydration status on glycemic regulation in healthy adults and explore underlying mechanisms. In this randomized crossover trial, 16 healthy adults (8 men, 8 women) underwent an oral glucose tolerance test (OGTT) when hypohydrated and rehydrated after 4 days of pretrial standardization. One […]

Related Product: Actiheart

Publication Date: February 20, 2019


The association between maternal-child physical activity levels at the transition to formal schooling: cross-sectional and prospective data from the Southampton Women’s Survey

Background Physical activity decreases through childhood, adolescence and into adulthood: parents of young children are particularly inactive, potentially negatively impacting their children’s activity levels. This study aimed to determine the association between objectively measured maternal and 6-year-old children’s physical activity; explore how this association differed by demographic and temporal factors; and identify change during the […]

Related Product: Actiheart

Publication Date: February 20, 2019


Central systolic pressure and a nonessential amino acid metabolomics profile: the African Prospective study on the Early Detection and Identification of Cardiovascular disease and Hypertension

Objectives: Early-life exposures to cardiovascular risk factors may manifest as early vascular ageing, a phenomenon to which black populations are more prone. The metabolome provides insight into the current state and regulation of physiological processes and was used to investigate the early molecular determinants of arterial stiffness. Methods: Black (N = 80) and white (N = 80) men and […]

Related Product: Actiheart

Publication Date: February 18, 2019


Physical activity energy expenditure and cardiometabolic health in three rural Kenyan populations

Objectives Physical activity is beneficial for metabolic health but the extent to which this may differ by ethnicity is still unclear. Here, the objective was to characterize the association between physical activity energy expenditure (PAEE) and cardiometabolic risk among the Luo, Kamba, and Maasai ethnic groups of rural Kenya. Methods In a cross‐sectional study of […]

Related Product: Actiheart

Publication Date: February 1, 2019


The DPhacto cohort: an overview of technically measured physical activity at work and leisure in blue-collar sectors for practitioners and researchers

For improved prevention of health issues among blue-collar workers, there is a need for an overview of the physical activity at work and leisure using technical long-term measurements in blue-collar sectors investigation of differences between the sectors. Thus, the objective of this paper was to provide an overview and investigate differences in physical activities and […]

Related Product: Actiheart

Publication Date: January 25, 2019


Hertfordshire Cohort Study Research Group. The Hertfordshire Cohort Study: an overview

The Hertfordshire Cohort Study is a nationally unique study of men and women born in the English county of Hertfordshire in the early part of the 20 th century. Records that detail their health in infancy and childhood have been preserved, their sociodemographic, lifestyle, medical and biological attributes have been characterised in later life, and […]

Related Product: Actiheart

Publication Date: January 22, 2019


Effects of aircraft noise exposure on heart rate during sleep in the population living near airports

Background Noise in the vicinity of airports is a public health problem. Many laboratory studies have shown that heart rate is altered during sleep after exposure to road or railway noise. Fewer studies have looked at the effects of exposure to aircraft noise on heart rate during sleep in populations living near airports. Objective The […]

Related Product: Actiheart

Publication Date: January 18, 2019


Physical activity in wheelchair-using youth with spina bifida: an observational study

Background Even though typically developing youth are already at risk for physical inactivity, youth with spina bifida may be even at higher risk as a consequence of their reduced mobility. No objective data is available for youth with spina bifida who use a manual wheelchair, so the seriousness of the problem is unknown. The purpose […]

Related Product: Actiheart

Publication Date: January 14, 2019


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