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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Found 61 Results

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


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

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


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


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


Benefits of a Paleolithic diet with and without supervised exercise on fat mass, insulin sensitivity, and glycemic control: a randomized controlled trial in individuals with type 2 diabetes

Background Means to reduce future risk for cardiovascular disease in subjects with type 2 diabetes are urgently needed. Methods Thirty‐two patients with type 2 diabetes (age 59 ± 8 years) followed a Paleolithic diet for 12 weeks. Participants were randomized to either standard care exercise recommendations (PD) or 1‐h supervised exercise sessions (aerobic exercise and resistance training) […]

Related Product: Actiheart

Publication Date: January 1, 2017


Sprint interval and moderate-intensity cycling training differentially affect adiposity and aerobic capacity in overweight young-adult women

The purpose of the study was to examine the effects of sprint interval training (SIT) and moderate-intensity continuous cycle training (MICT), with equal estimated energy expenditure during training on body composition and aerobic capacity. Body composition measured via dual-energy X-ray absorptiometry and aerobic capacity were assessed following 6 weeks of training in previously inactive overweight/obese […]

Related Product: Actiheart

Publication Date: July 27, 2016


The association of oxidative stress with arterial compliance and vascular resistance in a bi-ethnic population: the SABPA study

A loss of arterial elasticity increases the risk for cardiovascular events. Oxidative injury to the vessel wall may be one of the underlying mechanisms influencing arterial elasticity. We compared markers of oxidative stress, antioxidant capacity, inflammation, windkessel compliance (Cwk), and total peripheral resistance (TPR) in black and white South Africans. Associations of arterial compliance and […]

Related Product: Actiheart

Publication Date: July 8, 2016


Possible predictors of involuntary weight loss in patients with Alzheimer’s disease

Loss in body mass (∆BM) is a common feature in patients with Alzheimer’s disease (AD). However, the etiology of this phenomenon is unclear. The aim of this cohort study was to observe possible ∆BM in AD patients following a standard institutionalized diet. Secondary objective was to identify possible predictors of ∆BM. To this end, 85 […]

Related Product: Actiheart

Publication Date: June 27, 2016


Energy cost of activities in preschool-aged children

Background: The absolute energy cost of activities in children increases with age due to greater muscle mass and physical capability associated with growth and developmental maturation; however, there is a paucity of data in preschool-aged children. Study aims were 1) to describe absolute and relative energy cost of common activities of preschool-aged children in terms […]

Related Product: Actiheart

Publication Date: June 1, 2016


Strong and persistent effect on liver fat with a Paleolithic diet during a two-year intervention

Background/Objectives: Our objective was to investigate changes in liver fat and insulin sensitivity during a 2-year diet intervention. An ad libitum Paleolithic diet (PD) was compared with a conventional low-fat diet (LFD). Subjects/Methods: Seventy healthy, obese, postmenopausal women were randomized to either a PD or a conventional LFD. Diet intakes were ad libitum. Liver fat […]

Related Product: Actiheart

Publication Date: January 20, 2016


Validation of the Actiheart monitor for the measurement of physical activity

The Actiheart monitor uniquely allows simultaneous measurement of heart rate and movement counts. The purpose of this study was to establish validity evidence for the Actiheart monitor under laboratory and free-living conditions. A total of 34 college students (17 males and 17 females, age = 21.8 ± 3.6 years) participated in the study. In the […]

Related Product: Actiheart

Publication Date: January 15, 2009


Accuracy of the Actiheart for the assessment of energy expenditure in adults.

Background/Objective: The Actiheart (Mini Mitter, Sunriver, OR, USA) uses heart rate (HR) and activity data to predict activity energy expenditure (AEE). Currently, the Actiheart has only been tested during laboratory conditions. Therefore, the objective of this study was to validate the Actiheart prediction method against indirect calorimetry during a wide range of activities in a […]

Related Product: Actiheart

Publication Date: April 18, 2007


Oxyntomodulin increases energy expenditure in addition to decreasing energy intake in overweight and obese humans: a randomised controlled trial

Background: Oxyntomodulin has recently been found to decrease body-weight in obese humans and may be a potential anti-obesity therapy. Objective: To determine whether oxyntomodulin alters energy expenditure, in addition to reducing energy intake, in ‘free-living’ overweight and obese volunteers. Design: Randomized double-blind controlled cross-over trial. Setting: Community and hospital-based. Participants: Fifteen healthy overweight and obese […]

Related Product: Actiheart

Publication Date: December 1, 2006


Assessment of low-to-moderate intensity physical activity thermogenesis in young adults using synchronized heart rate and accelerometry with branched-equation modeling

Low-to-moderate intensity physical activity thermogenesis is a highly variable and quantitatively important component of total energy expenditure that is difficult to assess outside the laboratory. Greater precision and accuracy in the measurement of this key contributor to energy balance is a research priority. We developed a laboratory-based protocol that simulated a range of low-to-moderate intensity […]

Related Product: Actiheart

Publication Date: April 1, 2006


Effect of combined movement and heart rate monitor placement on physical activity estimates during treadmill locomotion and free-living

A placement effect on activity measures from movement sensors has been reported during treadmill and free-living activity. Positioning of electrodes may impact on movement artifact susceptibility as well as surface ECG waveform amplitudes and thus potentially on the precision by which heart rate (HR) is ascertained from such ECG traces. The purpose of this study […]

Related Product: Actiheart

Publication Date: December 13, 2005


Integration of physiological and accelerometer data to improve physical activity assessment

PURPOSE:Accurate measurement of physical activity (PA) is a prerequisite to determine dose-response relationships between activity and health. The combination of HR and accelerometers (ACC) holds promise for improving the accuracy of PA assessment, but it is unclear how currently proposed modeling techniques compare and to what extent different levels of individual calibration (IC) of HR […]

Related Product: Actiheart

Publication Date: November 1, 2005


Comparison of PAEE from combined and separate heart rate and movement models in children

PURPOSE:Accurate measurement of physical activity in children is a challenge. Combining physiological (e.g., heart rate (HR)) and body movement registration (e.g., accelerometry) may overcome limitations with either method used alone. This study aimed to compare the estimated physical activity energy expenditure (PAEE) from hip- and ankle-mounted MTI Actigraphs, a hip-mounted Actical, and a new combined […]

Related Product: Actiheart

Publication Date: October 1, 2005


Measurement of energy expenditure during laboratory and field activities

This dissertation was designed to examine the validity of heart rate (HR) and motion sensors for estimating energy expenditure (EE) during activities ranging from sedentary behaviors to vigorous exercise. A secondary purpose was to devise new ways to improve on current methods of estimating EE. Specific aims of the dissertation were: (1) to examine the […]

Related Product: Actiheart

Publication Date: August 1, 2005


Reliability and validity of the combined heart rate and movement sensor Actiheart

Accurate quantification of physical activity energy expenditure is a key part of the effort to understand disorders of energy metabolism. The Actiheart, a combined heart rate (HR) and movement sensor, is designed to assess physical activity in populations. Objective: To examine aspects of Actiheart reliability and validity in mechanical settings and during walking and running. […]

Related Product: Actiheart

Publication Date: February 16, 2005


Branched equation modeling of simultaneous accelerometry and heart rate monitoring improves estimate of directly measured physical activity energy expenditure

The combination of heart rate (HR) monitoring and movement registration may improve measurement precision of physical activity energy expenditure (PAEE). Previous attempts have used either regression methods, which do not take full advantage of synchronized data, or have not used movement data quantitatively. The objective of the study was to assess the precision of branched […]

Related Product: Actiheart

Publication Date: January 1, 2004


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