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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Dynamic personalized human body energy expenditure: Prediction using time series forecasting LSTM models
Dynamic human energy expenditure (EE) consists of energy costs for resting metabolism, food digestion, physical activity, and thermoregulation. Currently, multiple models predict EE mainly concerning physical activity, thus, discarding other factors contributing to the dynamic variation of EE. This paper aimed to demonstrate that (i) a dynamic human body EE prediction requires the time series […]
Related Product: Actiheart
Publication Date: September 7, 2023
A self-paced walk test for individual calibration of heart rate to energy expenditure
Introduction Estimating free-living physical activity (PA) with continuous heart rate (HR) monitoring is challenging due to individual variation in the relationship between HR and energy expenditure. This variation can be captured through individual calibration with graded exercise tests, but structured tests with prescribed load requires medical screening and are not always feasible in population settings. […]
Related Product: Actiheart
Publication Date: September 1, 2023
Adaptive Training on Basic AR Interactions: Bi-Variate Metrics and Neuroergonomic Evaluation Paradigms
Augmented Reality (AR) training is a cost-effective and safe alternative to traditional instructional methods. However, training novices in basic mid-air AR interactions remains challenging. To address this, we aimed to: (a) develop a robust metric to evaluate user performance across different AR interaction techniques and develop adaptation models to predict additional training requirements; (b) evaluate […]
Related Product: Actiheart
Publication Date: September 1, 2023
Activity behaviors before and during pregnancy are associated with women’s device-measured physical activity and sedentary time in later parenthood: a longitudinal cohort analysis
Purpose: To explore how activity behaviors before/during pregnancy relate to those in later parenthood, we assessed associations between sitting and moderate-/strenuous exercise before/during pregnancy, and sedentary time (SED) and moderate to vigorous physical activity (MVPA) 4–7 years postpartum (“later parenthood”). Methods: Longitudinal data were from the Southampton Women’s Survey, United Kingdom. Women reported time spent […]
Related Product: Actiheart
Publication Date: August 12, 2023
Post-exercise dietary macronutrient composition modulates components of energy balance in young, physically active adults
Abstract The effectiveness of exercise to reduce body mass is typically modest, partially due to energy compensation responses which may be linked to energy substrate availability around exercise. The present study aimed to investigate the effect of manipulating post-exercise energy substrate availability (high carbohydrate/low fat [HCLF] or low carbohydrate/high fat [LCHF] energy replacement) on energy […]
Related Product: Actiheart
Publication Date: August 10, 2023
Effects of 2‐year dietary and physical activity intervention on cognition in children—a nonrandomized controlled trial
Background and Objective We investigated the effects of a combined dietary and PA intervention on cognition in children and whether changes in diet quality, PA, sedentary behavior (SB), and sedentary time (ST) are associated with changes in cognition. Methods We conducted a 2-year nonrandomized controlled trial in 504 children aged 6–9 years at baseline. The children […]
Related Product: Actiheart
Publication Date: August 9, 2023
UDAMA: Unsupervised Domain Adaptation through Multi-discriminator Adversarial Training with Noisy Labels Improves Cardio-fitness Prediction
Deep learning models have shown great promise in various healthcare monitoring applications. However, most healthcare datasets with high-quality (gold-standard) labels are small-scale, as directly collecting ground truth is often costly and time-consuming. As a result, models developed and validated on small-scale datasets often suffer from overfitting and do not generalize well to unseen scenarios. At […]
Related Product: Actiheart
Publication Date: July 31, 2023
Neurophysiological, muscular, and perceptual adaptations of exoskeleton use over days during overhead work with competing cognitive demands
This study captured neurophysiological, muscular, and perceptual adaptations to shoulder exoskeleton use during overhead work with competing physical-cognitive demands. Twenty-four males and females, randomly divided into control and exoskeleton groups, performed an overhead reaching and pointing task over three days without (single task) and with (dual task) a working memory task. Task performance, electromyography (EMG), […]
Related Product: Actiheart
Publication Date: July 26, 2023
NUCB2/nesfatin-1 in the acute stress response of obese women with high and low anxiety
NUCB2/nesfatin-1 is an anorexigenic peptide hormone first known for its effects on energy homeostasis. More recently, a growing evidence suggests a role of NUCB2/nesfatin-1 in emotion regulation, particularly in the modulation of anxiety, depression and emotional stress response. Since stress-related mood disorders are often comorbid with obesity, we investigated the effect of acute psychosocial stress […]
Related Product: Actiheart
Publication Date: June 27, 2023
Accumulating Sedentary Time and Physical Activity from Childhood to Adolescence and Cardiac Function in Adolescence
Background Little is known about the associations of a sedentary lifestyle from childhood with cardiac work and function during adolescence. We studied if cumulative sedentary time and physical activity from childhood to adolescence are associated with cardiac work and function in adolescence. Methods A total of 153 adolescents aged 15 years at the time of […]
Related Product: Actiheart
Publication Date: June 23, 2023
Examining the Associations of Early Childhood Teacher’s Emotional Well-being with Physiologic Stress, Mindfulness and Self-Compassion
Background Recent national reports indicate that early childhood (EC) teachers experience exceptionally high levels of chronic stress which can lead to adverse health outcomes. In this presentation, we share preliminary evidence of a mindfulness-based intervention, Cultivating Healthy Intentional Mindful Educators (CHIME) to support EC teachers’ regulatory processes. We hypothesize EC teachers’ social-emotional health is related […]
Related Product: Actiheart
Publication Date: June 15, 2023
Resistance to thyroid hormone induced tachycardia in RTHα syndrome
Mutations in thyroid hormone receptor α1 (TRα1) cause Resistance to Thyroid Hormone α (RTHα), a disorder characterized by hypothyroidism in TRα1-expressing tissues including the heart. Surprisingly, we report that treatment of RTHα patients with thyroxine to overcome tissue hormone resistance does not elevate their heart rate. Cardiac telemetry in male, TRα1 mutant, mice indicates that […]
Related Product: Actiheart
Publication Date: June 7, 2023
Squash Versus Actiheart-Measured Physical Activity In The Middle-Aged General Population: The Neo Study
Background Adequate physical activity levels have been associated with wide-ranging beneficial health outcomes. It is therefore important to adequately measure physical activity. This is often done by the SQUASH (Short Questionnaire to Assess Health-enhancing physical activity), a patient-assessed instrument. However, this is a subjective method of which data on validity in large, middle-aged population groups […]
Related Product: Actiheart
Publication Date: May 30, 2023
Brain responses to food viewing in women during pregnancy and post partum and their relationship with metabolic health: study protocol for the FOODY Brain Study, a prospective observational study
Introduction Food cravings are common in pregnancy and along with emotional eating and eating in the absence of hunger, they are associated with excessive weight gain and adverse effects on metabolic health including gestational diabetes mellitus (GDM). Women with GDM also show poorer mental health, which further can contribute to dysregulated eating behaviour. Food cravings […]
Related Product: Actiheart
Publication Date: May 18, 2023
Demonstrating the applicability of using GPS and interview data to understand changes in use of space in response to new transport infrastructure: the case of the Cambridgeshire Guided Busway, UK
Introduction Changes to the built environment can contribute to behavioural changes at the population level, including increases in physical activity. Evidence for how such interventions affect behaviour through qualitative understanding complements quantitative evidence of effectiveness of interventions, and may help to strengthen the basis for causal inference. We demonstrate the use of objective data to […]
Related Product: Actiheart
Publication Date: May 17, 2023
Resting heart rate is a population-level biomarker of cardiorespiratory fitness: The Fenland Study
Introduction Few large studies have evaluated the relationship between resting heart rate (RHR) and cardiorespiratory fitness. Here we examine cross-sectional and longitudinal relationships between RHR and fitness, explore factors that influence these relationships, and demonstrate the utility of RHR for remote population monitoring. Methods In cross-sectional analyses (The UK Fenland Study: 5,722 women, 5,143 men, […]
Related Product: Actiheart
Publication Date: May 11, 2023
Are infrared thermography, feeding behavior, and heart rate variability measures capable of characterizing group-housed sow social hierarchies?
Group gestation housing is quickly becoming standard practice in commercial swine production. However, poor performance and welfare in group housed sows may result from the formation and maintenance of the social hierarchy within the pen. In the future, the ability to quickly characterize the social hierarchy via precision technologies could be beneficial to producers for […]
Related Product: Actiheart
Publication Date: May 9, 2023
Energy expenditure and intensity of ritual jumping–dancing in male Maasai
Objectives Traditional jumping–dance rituals performed by Maasai men involve prolonged physical exertion that may contribute significantly to overall physical activity level. We aimed to objectively quantify the metabolic intensity of jumping–dance activity and assess associations with habitual physical activity and cardiorespiratory fitness (CRF). Methods Twenty Maasai men (18–37 years) from rural Tanzania volunteered to participate in […]
Related Product: Actiheart
Publication Date: May 3, 2023
Cardiovascular risk and kidney function profiling using conventional and novel biomarkers in young adults: the African-PREDICT study
Background Low- and middle-income countries experience an increasing burden of chronic kidney disease. Cardiovascular risk factors, including advancing age, may contribute to this phenomenon. We (i) profiled cardiovascular risk factors and different biomarkers of subclinical kidney function and (ii) investigated the relationship between these variables. Methods We cross-sectionally analysed 956 apparently healthy adults between 20 […]
Related Product: Actiheart
Publication Date: April 13, 2023
Exercise and Artery Function in Twins: Sex Differences in a Cross-Over Trial
Background: Physical activity reduces cardiovascular risk, partly via direct effects on the arterial wall. We hypothesized that vascular function responses would be modality-specific, sex-dependent, and express a high degree of heritability. Methods: We recruited 90 same-sex twins (31 monozygotic, 14 dizygotic dizygotic pairs; 25.8±6.0 years) and randomized 70 (25 monozygotic, 10 dizygotic) to complete, as […]
Related Product: Actiheart
Publication Date: April 10, 2023
Assessment of Energy and Nutrient Intake and the Intestinal Microbiome (ErNst Study): Protocol and Methods of a Cross-sectional Human Observational Study
Background: On the national level, nutritional monitoring requires the assessment of reliable representative dietary intake data. To achieve this, standardized tools need to be developed, validated, and kept up-to-date with recent developments in food products and the nutritional behavior of the population. Recently, the human intestinal microbiome has been identified as an essential mediator between […]
Related Product: Actiheart
Publication Date: April 7, 2023
Identifying a urinary peptidomics profile for hypertension in young adults: The African‐PREDICT study
Hypertension is one of the most important and complex risk factors for cardiovascular diseases (CVDs). By using urinary peptidomics analyses, we aimed to identify peptides associated with hypertension, building a framework for future research towards improved prediction and prevention of premature development of CVD. We included 78 hypertensive and 79 normotensive participants from the African-PREDICT […]
Related Product: Actiheart
Publication Date: March 21, 2023
The effect of caloric restriction on genetical pathways
Energy restriction is defined as reducing nutrient intake without dragging the organism into malnutrition. Energy restriction is preferred because it is a non-genetic intervention that increases life expectancy. Nicotinamide adenine dinucleotide (NAD+) and adenosine monophosphate (AMP) levels, which are the indicators of intracellular energy deficiency, increase with energy restriction. The increase in NAD+ level stimulates […]
Related Product: Actiheart
Publication Date: March 21, 2023
How Does Occupational Lifting Affect Ambulatory Blood Pressure, Relative Aerobic Workload and Level of Physical Activity?
Introduction Occupational physical activity (OPA), including occupational lifting (OL), seems to increase the risk of cardiovascular disease (CVD). Knowledge about the association between OL and risk of CVD is sparse, but repeated OL is assumed to result in prolonged raised blood pressure and heart rate (HR) eventually augmenting the risk of CVD. To disentangle parts […]
Related Product: Actiheart
Publication Date: March 11, 2023
Impact of minimally invasive surgery on surgeon health (ISSUE) study: protocol of a single-arm observational study conducted in the live surgery setting
Introduction The rapid evolution of minimally invasive surgery has had a positive impact on patient outcomes; however, it is reported to be associated with work-related musculoskeletal symptoms (WMS) in surgeons. Currently there is no objective measure to monitor the physical and psychological impact of performing a live surgical procedure on the surgeon. Methods and analysis […]
Related Product: Actiheart
Publication Date: March 7, 2023
Changes in nocturnal heart rate variability in people living with HIV during the first year of antiretroviral therapy compared to HIV-uninfected community controls
Background: Higher nocturnal heart rate and lower nocturnal heart rate variability (HRV) is associated with increased cardiovascular disease mortality. Longitudinal studies on nocturnal HRV in people living with HIV (PLWH) are lacking. Methods: We conducted a one-year prospective cohort study of adult PLWH and HIV-uninfected community controls in north-western Tanzania. At enrollment, we collected data […]
Related Product: Actiheart
Publication Date: March 1, 2023
Evidence for protein leverage in a general population sample of children and adolescents
Background/Objectives The strong regulation of protein intake can lead to overconsumption of total energy on diets with a low proportion of energy from protein, a process referred to as protein leverage. The protein leverage hypothesis posits that protein leverage explains variation in energy intake and potentially obesity in ecological settings. Here, we tested for protein […]
Related Product: Actiheart
Publication Date: February 16, 2023
The association between plasma zinc concentrations and markers of glucose metabolism in adults in Cameroon
An abnormal Zn status has been suggested to play a role in the pathogenesis of type 2 diabetes. However, epidemiological studies of the relationship between plasma Zn concentrations and diabetes are sparse and inconclusive. We aimed to investigate the association between plasma Zn concentrations and glycaemic markers (fasting glucose, 2-h glucose and homeostatic model assessment […]
Related Product: Actiheart
Publication Date: January 25, 2023
Case Report: Effect of low energy availability and training load on sleep in a male combat sport athlete
Purpose: The aim of this case report was to describe the sleep responses in a male combat sport athlete, who was engaging in both chronic (CWL) and acute (AWL) weight loss practices in order to reduce body mass for a national competition. Methods: During the first seven weeks of training (Phases 1 and 2), the […]
Related Product: Actiheart
Publication Date: January 6, 2023
Breaking up sitting with short frequent or long infrequent physical activity breaks does not lead to compensatory changes in appetite, appetite-regulating hormones or energy intake
The aim of this study was to determine the appetite-related responses to breaking up prolonged sitting with physical activity bouts differing in frequency and duration among adult females. Fourteen sedentary females aged 34 ± 13 years with a body mass index of 27.1 ± 6.3 kg/m2 (mean ± SD) took part in a randomised crossover […]
Related Product: Actiheart
Publication Date: January 4, 2023
Sedentary Lifestyle Implication on Cardio-Autonomic Function and Adaptation to Archery as a Reversible Intervention
The study’s objectives were to investigate the effects of a 12-week sedentary lifestyle on heart rate variability (HRV) and the effectiveness of archery as an intervention in a sedentary young population. 34 young people were divided into the sedentary group (SG) and the archery group at random (IG). While IG underwent a 12-week archery intervention […]
Related Product: Actiheart
Publication Date: January 1, 2023
Heart Rate Variability and Stress in the Intensive Care Unit Nursing Workplace
Intensive care unit (ICU) nurses work in a demanding environment, facing repeated encounters with trauma and ethical issues when caring for patients. Psychological stressors can include death of patients, violent acts by patients or their families, caring for suffering patients, and moral distress from performing futile care. These factors place ICU nurses at increased risk […]
Related Product: Actiheart
Publication Date: January 1, 2023
Short, frequent high-intensity physical activity breaks reduce appetite compared with a continuous moderate-intensity exercise bout
A single exercise session can affect appetite-regulating hormones and suppress appetite. The effects of short, regular physical activity breaks across the day on appetite are unclear. This study investigated the effects of breaking up sitting with high-intensity physical activity vs a single bout of moderate-intensity exercise and prolonged sitting on appetite control. In this randomised […]
Related Product: Actiheart
Publication Date: December 22, 2022
Longitudinal cardio-respiratory fitness prediction through wearables in free-living environments
Cardiorespiratory fitness is an established predictor of metabolic disease and mortality. Fitness is directly measured as maximal oxygen consumption (VO2max), or indirectly assessed using heart rate responses to standard exercise tests. However, such testing is costly and burdensome because it requires specialized equipment such as treadmills and oxygen masks, limiting its utility. Modern wearables capture […]
Related Product: Actiheart
Publication Date: December 2, 2022
Effects of resilience training on mental, emotional, and physical stress outcomes in military officer cadets
Resilience is an important factor in counteracting the harmful effects of stress and is associated with healthy physiological and psychological responses to stress. Previous research has demonstrated the effectiveness of resilience fostering training programs in psychobiological stress response and recovery. Few studies, however, have examined training effects in real-life high-stress situations. In this study, we […]
Related Product: Actiheart
Publication Date: December 1, 2022
Efficacy and tolerability of a specific blend of amino acids in patients with anorexia nervosa treated in a hospital setting. Study protocol for a randomized controlled trial
Background Specific blends of essential amino acids (EAA) containing a high percentage of branched-chain amino acids preserves mitochondrial metabolism and higher physical resistance in elderly mice, increasing their survival and improving physical performance and cognitive functions in malnourished elderly patients. However, no study has been yet done on patients with anorexia nervosa (AN) who regain […]
Related Product: Actiheart
Publication Date: November 29, 2022
The association between number and ages of children and the physical activity of mothers: Cross-sectional analyses from the Southampton Women’s Survey
Background Physical activity (PA) has many health benefits, but motherhood is often associated with reduced PA. Considering that ages and number of children may be associated with maternal PA, and that PA patterns may change as children transition to formal schooling, we aimed to investigate the associations between ages and number of children and device-measured […]
Related Product: Actiheart
Publication Date: November 16, 2022
Physical activity volume and intensity distribution in relation to bone, lean and fat mass in children
Considering physical activity (PA) volume and intensity may provide novel insights into the relationships of PA with bone, lean, and fat mass. This study aimed to assess the associations of PA volume, PA intensity distribution, including moderate-to-vigorous PA (MVPA) with total-body-less-head bone mineral content (BMC), lean, and fat mass in children. A population sample of […]
Related Product: Actiheart
Publication Date: November 3, 2022
Timing of physical activity in relation to liver fat content and insulin resistance
Aims/hypothesis We hypothesised that the insulin-sensitising effect of physical activity depends on the timing of the activity. Here, we examined cross-sectional associations of breaks in sedentary time and timing of physical activity with liver fat content and insulin resistance in a Dutch cohort. Methods In 775 participants of the Netherlands Epidemiology of Obesity (NEO) study, […]
Related Product: Actiheart
Publication Date: November 1, 2022
Effects of pre-meal whey protein consumption on acute food intake and energy balance over a 48-hour period
The effects of pre-meal whey protein consumption on acute food intake and subsequent energy balance measured over 48-h was investigated in males of healthy-weight (HW) or living with overweight and obesity (OV/OB). On two separate trial days, following a controlled breakfast (09:00) and lunch (13:00), 12 HW and 12 OV/OB males consumed either whey protein […]
Related Product: Actiheart
Publication Date: October 27, 2022
Identifying Early Predictors of Learning in VR-based Drone Training
The use of small unmanned aerial systems, or drones, has grown rapidly in recent years, but the FAA has no formal requirement for hands-on training. Physical drone training has major limitations, and virtual reality (VR) offers a promising alternative. This study sought to identify early performance markers of learning in VR-based drone training using a […]
Related Product: Actiheart
Publication Date: October 27, 2022
Mask-wearing: effects on cognitive task performance and cardiac workload indices
Consistent with CDC recommendations and government mandates during COVID, masks are commonly required/suggested in public gathering places like workplaces and schools. Considering the implications for human factors research, the extent to which mask-wearing impacts cognitive abilities and/or workload assessment from cardiac indicators are unknown. This study investigated these effects by engaging subjects in cognitively-loading tasks […]
Related Product: Actiheart
Publication Date: October 27, 2022
Assessment of cardiovascular load among hotel room cleaners
Hotel room cleaners are a vulnerable population at risk for cardiovascular disease. To evaluate their workload heart rate (HR), % heart rate reserve (%HRR), blood pressure (BP), metabolic equivalent (MET), and energy expenditure (EE) were measured over two workdays and two off-workdays. The mean age was 45.5 (SD 8.2) years with a mean 10.4 (SD […]
Related Product: Actiheart
Publication Date: September 23, 2022
The association between sleep duration and detailed measures of obesity: A cross sectional analysis in the ADDITION‐PRO study
Background Sleep duration is associated with BMI and waist circumference. However, less is known about whether sleep duration affects different measurements of obesity differently. Objective To investigate the association between sleep duration and different measures of obesity. Methods In this cross-sectional analysis 1309, Danish, older adults (55% men) completed at least three days of wearing […]
Related Product: Actiheart
Publication Date: September 16, 2022
Issues related to the assessment of energy balance during short-term over-, under-and refeeding in normal weight men
Background In humans, it is unclear how different estimates of energy balance (EB) compare with each other and whether the resulting changes in body weight (bw) and body composition (BC) are predictable and reproducible. Methods This is a secondary data analysis of effects of sequential 7d over- (OF), 21d under- (UF) and 14d refeeding (RF) […]
Related Product: Actiheart
Publication Date: September 8, 2022
Human adaptation to immobilization: Novel insights of impacts on glucose disposal and fuel utilization
Background Bed rest (BR) reduces whole-body insulin-stimulated glucose disposal (GD) and alters muscle fuel metabolism, but little is known about metabolic adaptation from acute to chronic BR nor the mechanisms involved, particularly when volunteers are maintained in energy balance. Methods Healthy males (n = 10, 24.0 ± 1.3 years), maintained in energy balance, underwent 3-day […]
Related Product: Actiheart
Publication Date: September 4, 2022
A randomized placebo-controlled trial of nicotinamide riboside and pterostilbene supplementation in experimental muscle injury in elderly individuals
BACKGROUND. During aging, there is a functional decline in the pool of muscle stem cells (MuSCs) that influences the functional and regenerative capacity of skeletal muscle. Preclinical evidence has suggested that nicotinamide riboside (NR) and pterostilbene (PT) can improve muscle regeneration, e.g., by increasing MuSC function. The objective of this study was to investigate if […]
Related Product: Actiheart
Publication Date: August 23, 2022
Activity Behaviors in British 6-Year-Olds: Cross-Sectional Associations and Longitudinal Change During the School Transition
Background: To explore activity behaviors at school entry, we describe temporal/demographic associations with accelerometer- measured physical activity in a population-based sample of British 6-year-olds, and examine change from ages 4 to 6. Methods: A total of 712 six-year-olds (308 at both ages) wore Actiheart accelerometers for ≥ 3 (mean 6.0) days. We derived minutes per […]
Related Product: Actiheart
Publication Date: August 11, 2022
Physiological and perceptual consequences of trust in collaborative robots: An empirical investigation of human and robot factors
Measuring trust is an important element of effective human-robot collaborations (HRCs). It has largely relied on subjective responses and thus cannot be readily used for adapting robots in shared operations, particularly in shared-space manufacturing applications. Additionally, whether trust in such HRCs differ under altered operator cognitive states or with sex remains unknown. This study examined […]
Related Product: Actiheart
Publication Date: August 3, 2022
Heart rate variability during sleep after two, four and seven consecutive night shifts and recovery days: a cross-over intervention study
Objective Recovery after shift work is an important part reducing the health problems related to shift work. Heart rate variability (HRV) is an indicator of the balance between sympathetic and parasympathetic activity in the autonomic nervous system and can be used as a measure of recovery after night shifts. The aim of the study is […]
Related Product: Actiheart
Publication Date: August 2, 2022
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