Publications
CamNtech Research Library
CamNtech products have been trusted by specialist researchers for over 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.
Cognitive dietary restraint score is associated with lower energy, carbohydrate, fat, and grain intake among female adolescent endurance runners
This cross-sectional study investigated associations between cognitive dietary restraint (CDR), energy, macronutrient and food group intake, menstrual function, and bone density in female adolescent endurance runners. Participants were forty female adolescent endurance runners. The independent variable was CDR, as assessed by the Three Factor Eating Questionnaire (TFEQ). Runners with CDR subscale scores ≥11 were classified […]
Related Product: Actiheart
Publication Date: November 25, 2020
The Psychological and Physiological Consequences of Low Energy Availability in a Male Combat Sport Athlete
Purpose: To evaluate the effects of low energy availability (EA) on health and performance indices associated with the Male Athlete Triad and Relative Energy Deficiency in Sports (RED-S) models. Methods: Over an 8 week period, a male combat sport athlete adhered to a phased body mass (BM) loss plan consisting of 7 weeks energy intake […]
Related Product: Actiheart
Publication Date: October 22, 2020
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
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
Infusion of donor feces affects the gut-brain axis in humans with metabolic syndrome
Objectives Increasing evidence indicates that intestinal microbiota play a role in diverse metabolic processes via intestinal butyrate production. Human bariatric surgery data suggest that the gut-brain axis is also involved in this process, but the underlying mechanisms remain unknown. Design We compared the effect of fecal microbiota transfer (FMT) from post-Roux-en-Y gastric bypass (RYGB) donors […]
Related Product: Actiheart
Publication Date: July 3, 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
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
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
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
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
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
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
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
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
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
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
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
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
The test-retest reliability and criterion validity of the Sensewear mini and Actiheart in two climatologically different countries
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 in two climatologically different countries, i.e. Suriname (tropical rainforest climate) and Belgium (oceanic climate). Fifty-six healthy participants (18–40 years) were recruited (Suriname: […]
Related Product: Actiheart
Publication Date: April 27, 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
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
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
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
Physical activity patterns associated with a pedagogical intervention in six to eight year old children in an urban school
Aim: This study evaluated changes in energy expenditure in six to eight year-old children after a two year pedagogical intervention on healthy habits. Methods: This was a longitudinal descriptive observational study in children at a private school in Bogotá. Outcomes: change in the average energy expenditure (Kcal/day) and time dedicated to physical activity. The children’s […]
Related Product: Actiheart
Publication Date: January 11, 2019
Exercise dependence, eating disorder symptoms and biomarkers of Relative Energy Deficiency in Sports (RED-S) among male endurance athletes
Objectives To explore associations betweenexercise dependence, eating disorder (ED) symptoms and biomarkers of Relative Energy Deficiency in Sports (RED-S) among male endurance athletes. Methods Fifty-three healthy well-trained male cyclists, triathletes and long-distance runners recruited from regional competitive sports clubs were included in this cross-sectional study. The protocol comprised the Exercise Dependence Scale (EXDS), the ED […]
Related Product: Actiheart
Publication Date: January 10, 2019
Leptin and the vasculature in young adults: The African‐PREDICT study
Background and aim Information regarding the effect of leptin on the vasculature in young healthy adults at risk for cardiovascular disease development is limited. We therefore examined the associations between measures of subclinical atherosclerosis (carotid intima‐media thickness, carotid cross‐sectional wall area), large artery stiffness (pulse wave velocity) and a measure of endothelial dysfunction (von Willebrand […]
Related Product: Actiheart
Publication Date: January 1, 2019
Association between activity energy expenditure and peak oxygen consumption with sarcopenia
Background Sedentariness may be an important risk factor for sarcopenia. The aim of this work was to assess the association between muscle mass and strength and markers of usual physical activity such as activity energy expenditure and peak oxygen uptake. Methods Young and old participants were assessed measuring body composition by DEXA (double beam X […]
Related Product: Actiheart
Publication Date: December 3, 2018
How well do activity monitors estimate energy expenditure? A systematic review and meta-analysis of the validity of current technologies
Objective To determine the accuracy of wrist and arm-worn activity monitors’ estimates of energy expenditure (EE). Data sources SportDISCUS (EBSCOHost), PubMed, MEDLINE (Ovid), PsycINFO (EBSCOHost), Embase (Ovid) and CINAHL (EBSCOHost). Design A random effects meta-analysis was performed to evaluate the difference in EE estimates between activity monitors and criterion measurements. Moderator analyses were conducted to […]
Related Product: Actiheart
Publication Date: September 7, 2018
Factors that influence the rating of perceived exertion after endurance training
Purpose: Session rating of perceived exertion (sRPE) is an often-used measure to assess athletes’ training load (TL). However, little is known about which factors could optimize the quality of data collection thereof. The aim of this study was to investigate the effects of the survey methods and the time points when sRPE was assessed on […]
Related Product: PRO-Diary
Publication Date: September 1, 2018
Intakes and sources of dietary sugars and their association with metabolic and inflammatory markers
Background & aims Associations of dietary sugars with metabolic and inflammatory markers may vary according to the source of the sugars. The aim of this study was to examine the association of dietary sugars from different sources [beverages (liquids), foods (solids), extrinsic (free) or intrinsic (non-free)] with metabolic and inflammatory markers. Methods Population-based cross-sectional study […]
Related Product: Actiheart
Publication Date: August 1, 2018
Habitual physical activity levels do not predict leg strength and power in healthy, active older adults
Physical activity is considered crucial in attenuating losses in strength and power associated with ageing. However, in well-functioning, active older adults the relationship between habitual physical activity and muscle function is surprisingly unclear. Leg press velocity, force, and power, were compared between 50 older and 30 younger healthy individuals, and associations with habitual physical activity […]
Related Product: Actiheart
Publication Date: July 2, 2018
Relation of oxygen uptake to work rate in prepubertal healthy children–reference for VO 2/W‐slope and effect on cardiorespiratory fitness assessment
Purpose Exercise testing by cycle ergometer allows to observe the interaction between oxygen uptake (VO 2) and workload (W), and VO 2/W‐slope can be used as a diagnostic tool. Respectively, peak oxygen uptake (VO 2PEAK ) can be estimated by maximal workload. We aim to determine reference for VO 2/W‐slope among prepubertal children and define […]
Related Product: Actiheart
Publication Date: July 1, 2018
A heterogeneous response of liver and skeletal muscle fat to the combination of a Paleolithic diet and exercise in obese individuals with type 2 diabetes: a randomised controlled trial
Aims/hypothesis The aim of the study was to investigate ectopic fat deposition and insulin sensitivity, in a parallel single-blinded randomised controlled trial, comparing Paleolithic diet alone with the combination of Paleolithic diet and exercise in individuals with type 2 diabetes. Methods Thirty-two individuals with type 2 diabetes with BMI 25–40 kg/m2 and 30–70 years of […]
Related Product: Actiheart
Publication Date: April 26, 2018
Acute cardiometabolic responses to three modes of treadmill exercise in older adults with Parkinson’s disease
The purpose of this study was to compare acute cardiometabolic responses to 3 modes of treadmill exercise in adults diagnosed with Parkinson’s disease (PD). Eight elderly adults with PD (67.9 ± 3.0 yr) completed 1 session each on a land, aquatic, and antigravity treadmill at 50% body weight. Participants walked from 1 to 3 mph in 0.5-mph […]
Related Product: Actiheart
Publication Date: March 1, 2018
Physical activity duration but not energy expenditure differs between daily and intermittent breakfast consumption in adolescent girls: A randomized crossover trial
Background It is not known whether breakfast frequency affects physical activity (PA) in children or adolescents. Objective This study examined the effect of daily compared with intermittent breakfast consumption on estimated PA energy expenditure (PAEE) in adolescent girls. Methods Under a randomized crossover design, 27 girls [mean ± SD age: 12.4 ± 0.5 y, body […]
Related Product: Actiheart
Publication Date: February 27, 2018
Risk accuracy of type 2 diabetes in middle aged adults: Associations with sociodemographic, clinical, psychological and behavioural factors.
Objective To identify the proportion of individuals with an accurate perception of their risk of type 2 diabetes (T2D) prior to, immediately after and eight weeks after receiving a personalised risk estimate. Additionally, we aimed to explore what factors are associated with underestimation and overestimation immediately post-intervention. Methods Cohort study based on the data collected […]
Related Product: Actiheart
Publication Date: January 1, 2018
Transient cardiac dysfunction but elevated cardiac and kidney biomarkers 24 h following an ultra-distance running event in Mexican Tarahumara
Background The Mexican Tarahumara are accustomed to running ultra-distance races. No data exist on the acute physiological changes following ultra-distance running and physiological-biomarker associations in this population. Thus, we aimed to investigate the acute impact (≤ 24 h) on functional and biochemical changes of the cardiac muscle and biochemical changes associated with kidney function following […]
Related Product: Actiheart
Publication Date: November 12, 2017
Interplay of socioeconomic status and supermarket distance is associated with excess obesity risk: a UK cross-sectional study
U.S. policy initiatives have sought to improve health through attracting neighborhood supermarket investment. Little evidence exists to suggest that these policies will be effective, in particular where there are socioeconomic barriers to healthy eating. We measured the independent associations and combined interplay of supermarket access and socioeconomic status with obesity. Using data on 9702 UK […]
Related Product: Actiheart
Publication Date: October 25, 2017
An original piecewise model for computing energy expenditure from accelerometer and heart rate signals
Objective: Activity energy expenditure (EE) plays an important role in healthcare, therefore, accurate EE measures are required. Currently available reference EE acquisition methods, such as doubly labeled water and indirect calorimetry, are complex, expensive, uncomfortable, and/or difficult to apply on real time. To overcome these drawbacks, the goal of this paper is to propose a […]
Related Product: Actiheart
Publication Date: July 28, 2017
Feeding influences adipose tissue responses to exercise in overweight men
Feeding profoundly affects metabolic responses to exercise in various tissues, but the effect of feeding status on human adipose tissue responses to exercise has never been studied. Ten healthy overweight men aged 26 ± 5 yr (mean ± SD) with a waist circumference of 105 ± 10 cm walked at 60% of maximum oxygen uptake under either fasted or fed conditions […]
Related Product: Actiheart
Publication Date: July 7, 2017
Irisin is weakly associated with usual physical activity in young overweight women
Purpose: To determine if irisin plasma levels are associated with regular physical activity, body composition and metabolic parameters in women subjected to calorie restriction. Subjects and methods: We studied 42 women aged 34 ± 13 years with a body mass index of 27.7 ± 1.8 kg/m2, who were subjected to a calorie restriction for three […]
Related Product: Actiheart
Publication Date: June 1, 2017
Measurement of physical activity and energy expenditure in wheelchair users: methods, considerations and future directions
Accurately measuring physical activity and energy expenditure in persons with chronic physical disabilities who use wheelchairs is a considerable and ongoing challenge. Quantifying various free-living lifestyle behaviours in this group is at present restricted by our understanding of appropriate measurement tools and analytical techniques. This review provides a detailed evaluation of the currently available measurement […]
Related Product: Actiheart
Publication Date: March 1, 2017
Assessment of laboratory and daily energy expenditure estimates from consumer multi-sensor physical activity monitors
Wearable physical activity monitors are growing in popularity and provide the opportunity for large numbers of the public to self-monitor physical activity behaviours. The latest generation of these devices feature multiple sensors, ostensibly similar or even superior to advanced research instruments. However, little is known about the accuracy of their energy expenditure estimates. Here, we […]
Related Product: Actiheart
Publication Date: February 24, 2017
Usefulness of motion sensors to estimate energy expenditure in children and adults: a narrative review of studies using DLW
It is well documented that meeting moderate-to-vigorous physical activity guidelines of 150 min per week is protective against chronic disease, and this is likely explained by higher energy expenditure (EE). In opposition, sedentary behavior (low EE) seems to impair health outcomes. There are gold standard methods to measure EE such as the doubly labeled water (DLW) […]
Related Product: Actiheart
Publication Date: February 1, 2017
Comparison of energy expenditure and heart rate responses between three commercial group fitness classes.
Objectives The objectives of this study were to compare the energy expenditure and heart rate responses between three commercial group fitness classes (group resistance exercise [PUMP]; indoor stationary cycling [RIDE]; and step aerobics [STEP]). Design One-Way Repeated Measures incorporating a Latin Square Design for class randomisation. Methods Ten participants (5 males and 5 females) completed […]
Related Product: Actiheart
Publication Date: January 24, 2017
Increased heart rate and energy expenditure in frontotemporal dementia.
The obesity paradox, whereby being overweight or obese during mid-life is associated with higher rates of dementia in later life, while low body mass index (BMI) in older populations is associated with a higher risk of dementia, has been demonstrated in multiple studies of patients with Alzheimer’s disease (Fitzpatrick et al., 2009). In another neurodegenerative […]
Related Product: Actiheart
Publication Date: January 1, 2017
Page 2 of 6