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.
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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
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
Estimation of physical activity energy expenditure during free-living from wrist accelerometry in UK adults
Background Wrist-worn accelerometers are emerging as the most common instrument for measuring physical activity in large-scale epidemiological studies, though little is known about the relationship between wrist acceleration and physical activity energy expenditure (PAEE). Methods 1695 UK adults wore two devices simultaneously for six days; a combined sensor and a wrist accelerometer. The combined sensor […]
Related Product: Actiheart
Publication Date: December 19, 2016
Investigating the physiological and psychosocial responses of single-and dual-player exergaming in young adults
Objective: This study investigated the effect of acute exergaming on the physiological and psychosocial responses of young adults and the modulatory effect of a single- or dual-player game play situation. Materials and Methods: Thirty-six participants (19 male; 21.7 ± 3.8 years; 23.65 ± 3.17 kg/m2) each completed two 30-minute exergame sessions in a randomized order (single and dual player) while […]
Related Product: Actiheart
Publication Date: December 1, 2016
Energy expenditure in frontotemporal dementia: a behavioural and imaging study
Abnormal eating behaviour and metabolic parameters including insulin resistance, dyslipidaemia and body mass index are increasingly recognized as important components of neurodegenerative disease and may contribute to survival. It has previously been established that behavioural variant frontotemporal dementia is associated with abnormal eating behaviour characterized by increased sweet preference. In this study, it was hypothesized […]
Related Product: Actiheart
Publication Date: October 27, 2016
Low-power metabolic equivalents estimation algorithm using adaptive acceleration sampling.
This paper describes a proposed low-power metabolic equivalent estimation algorithm that can calculate the value of metabolic equivalents (METs) from triaxial acceleration at an adaptively changeable sampling rate. This algorithm uses four rates of 32, 16, 8 and 4 Hz. The mode of switching them is decided from synthetic acceleration. Applying this proposed algorithm to […]
Related Product: Actiwave
Publication Date: October 18, 2016
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
Rational and design of an overfeeding protocol in constitutional thinness: Understanding the physiology, metabolism and genetic background of resistance to weight gain.
Background Constitutional thinness (CT) is a natural state of underweight (13–17.5 kg/m2) without the presence of any eating disorders and abnormal hormonal profile, and with preserved menses in women. We previously conducted a four-week fat overfeeding study showing weight gain resistance in CT women and one of our main results was the identification of an […]
Related Product: Actiheart
Publication Date: July 15, 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
Why do nurses get fatigued? Energy expended, stress or ego depletion?
Background: Fatigue increases throughout the working day and may lead to inefficiency and errors. Why do people become fatigued: because of the cumulative effects of energy expenditure (EE), the stress experienced or the accumulation of ego depleting demands? These questions were examined in nurses assessed in real time over two work shifts. Methods: 100 nurses […]
Related Product: Actiheart
Publication Date: December 13, 2015
Sodium bicarbonate ingestion augments the increase in PGC-1α mRNA expression during recovery from intense interval exercise in human skeletal muscle
We tested the hypothesis that ingestion of sodium bicarbonate (NaHCO3) prior to an acute session of high-intensity interval training (HIIT) would augment signaling cascades and gene expression linked to mitochondrial biogenesis in human skeletal muscle. On two occasions separated by ∼1 wk, nine men (mean ± SD: age 22 ± 2 yr, weight 78 ± […]
Related Product: Actiheart
Publication Date: December 1, 2015
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