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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Use of the Polar V800 and Actiheart 5 heart rate monitors for the assessment of heart rate variability (HRV) in horses
Heart rate variability (HRV) is a commonly used metric in animal science to quantify an aspect of the physiological response to stressors. HRV analysis relies upon accurate detection of the electrical activity of the heart to define inter-beat interval (IBI). In horses, this can be problematic due to specific features of the equine ECG waveform […]
Related Product: Actiheart
Publication Date: July 19, 2021
A randomized controlled trial to isolate the effects of fasting and energy restriction on weight loss and metabolic health in lean adults
Intermittent fasting may impart metabolic benefits independent of energy balance by initiating fasting-mediated mechanisms. This randomized controlled trial examined 24-hour fasting with 150% energy intake on alternate days for 3 weeks in lean, healthy individuals (0:150; n = 12). Control groups involved a matched degree of energy restriction applied continuously without fasting (75% energy intake […]
Related Product: Actiheart
Publication Date: July 13, 2021
How can we better prepare new doctors for the tasks and challenges of ward rounds?: An observational study of junior doctors’ experiences
Purpose Ward rounds play a crucial role in the delivery of patient care in inpatient settings, but involve a complex mix of tasks, skills and challenges for junior doctors to negotiate. This study informs the development of high-quality training by identifying the activities that junior doctors perform, and those associated with stress during real-life ward […]
Related Product: Actiheart
Publication Date: July 5, 2021
A feedforward neural network for drone accident prediction from physiological signals
Purpose As drones are rapidly transforming tasks such as mapping and surveying, safety inspection and progress monitoring, human operators continue to play a critical role in ensuring safe drone missions in compliance with safety regulations and standard operating procedures. Research shows that operator’s stress and fatigue are leading causes of drone accidents. Building upon the […]
Related Product: Actiheart
Publication Date: June 9, 2021
Registration of 24-hour accelerometric rest-activity profiles and its application to human chronotypes
By collecting data continuously over 24 hours, accelerometers and other wearable devices can provide novel insights into circadian rhythms and their relationship to human health. Existing approaches for analyzing diurnal patterns using these data, including the cosinor model and functional principal component analysis, have revealed and quantified population-level diurnal patterns, but considerable subject-level variability remained […]
Related Product: Actiheart
Publication Date: May 31, 2021
Sleep duration regularity as a predictor of the cardiovascular response to acute exercise
High-intensity exercise represents a challenge for the cardiovascular system, especially under conditions of insufficient sleep. For example, following one night of partial sleep restriction, healthy young men exhibited increased heart rate, minute ventilation, and plasma lactate concentration during submaximal and maximal exercise compared to one night of normal sleep [1]. In addition to sleep duration, […]
Related Product: Actiheart
Publication Date: May 31, 2021
Effects of short-term graded dietary carbohydrate intake on intramuscular and whole-body metabolism during moderate-intensity exercise
Altering dietary carbohydrate (CHO) intake modulates fuel utilization during exercise. However, there has been no systematic evaluation of metabolic responses to graded changes in short-term (< 1 week) dietary CHO intake. Thirteen active men performed interval running exercise combined with isocaloric diets over 3 days before evaluation of metabolic responses to 60-min running at 65% […]
Related Product: Actiheart
Publication Date: May 27, 2021
Adolescent Endurance Runners Exhibit Suboptimal Energy Availability and Intakes of Key Nutrients
Backgroud: Despite the evidence of an elevated prevalence of low bone mass in adolescent endurance runners, reports on dietary intake in this population is limited. Objectives: This study aimed to evaluate energy availability (EA) and dietary intake among 72 (n = 60 female, n = 12 male) high school cross-country runners. Methods: The sample consisted of a combined dataset […]
Related Product: Actiheart
Publication Date: May 25, 2021
Low Physical Activity Is Associated With Impaired Endothelial Function in Patients With Type 2 Diabetes and Controls After 5 Years of Follow-up
Background: The long-term association between physical activity and endothelial function has not previously been investigated in patients with type 2 diabetes. Therefore, we aimed to evaluate the relationship between physical activity and endothelial function, estimated by peripheral arterial tonometry, in patients with type 2 diabetes and non-diabetic controls after 5 years of follow-up. Methods: : […]
Related Product: Actiheart
Publication Date: May 20, 2021
Socio‐economic inequalities, modifiable lifestyle risk factors and retinal vessel calibers: The African‐PREDICT Study
Objective Lifestyle risk factors vary between socioeconomic status (SES) groups and may influence cardiovascular function differently. The retinal microvasculature allows for monitoring early changes in cardiovascular health, therefore we investigated whether retinal vessel calibers associate differently with modifiable risk factors in different SES groups. Methods We included 1064 young adults (aged 20-30 years) grouped by […]
Related Product: Actiheart
Publication Date: May 19, 2021
Heart rate and heart rate variability as outcomes and longitudinal moderators of treatment for pain across follow-up in Veterans with Gulf War illness
Aims Accumulating evidence suggests Gulf War illness (GWI) is characterised by autonomic nervous system dysfunction (higher heart rate [HR], lower heart rate variability [HRV]). Yoga – an ancient mind-body practice combining mindfulness, breathwork, and physical postures – is proposed to improve autonomic dysfunction yet this remains untested in GWI. We aimed to determine (i) whether […]
Related Product: Actiheart
Publication Date: May 11, 2021
Cohort Profile: Multimorbidity in Children and Youth Across the Life-course (MY LIFE) Study
Objective This manuscript serves to provide an overview of the methods of the Multimorbidity in Children and Youth across the Life-course (MY LIFE) study, profile sample characteristics of the cohort, and provide baseline estimates of multimorbidity to foster collaboration with clinical and research colleagues across Canada. Method MY LIFE is comprised of 263 children (2–16 […]
Related Product: Actiheart
Publication Date: May 1, 2021
Heart rate during work and heart rate variability during the following night: a day-by-day investigation on the physical activity paradox among blue-collar workers
Objectives: Contrary to leisure-time physical activity, occupational physical activity (OPA) may have harmful health effects, called the physical activity paradox. A proposed mechanism is that OPA can elevate the heart rate (HR) for several hours per day. We aimed to investigate the association between the mean intensity of OPA and HR variability (HRV) indices the […]
Related Product: Actiheart
Publication Date: April 30, 2021
Objectifying the Subjective: The Use of Heart Rate Variability as a Psychosocial Symptom Biomarker in Hospice and Palliative Care Research
Measuring psychosocial symptoms in hospice and palliative care research is critical to understanding the patient and caregiver experience. Subjective patient-reported outcome tools have been the primary method for collecting these data in palliative care, and the growing field of biobehavioral research offers new tools that could deepen our understanding of psychosocial symptomatology. Here we describe […]
Related Product: Actiheart
Publication Date: April 29, 2021
Physical activity attenuates postprandial hyperglycaemia in homozygous TBC1D4 loss-of-function mutation carriers
Aims/hypothesis The common muscle-specific TBC1D4 p.Arg684Ter loss-of-function variant defines a subtype of non-autoimmune diabetes in Arctic populations. Homozygous carriers are characterised by elevated postprandial glucose and insulin levels. Because 3.8% of the Greenlandic population are homozygous carriers, it is important to explore possibilities for precision medicine. We aimed to investigate whether physical activity attenuates the […]
Related Product: Actiheart
Publication Date: April 29, 2021
Longitudinal associations of physical activity, sedentary time, and cardiorespiratory fitness with arterial health in children–the PANIC study
We investigated the longitudinal associations of physical activity (PA), sedentary time (ST), and cardiorespiratory fitness (CRF) with arterial health among children. In our primary analyses, we investigated 245 children (girls 51.8%) aged 6-9 years participating in the baseline examinations who had data on arterial health at 2-year follow-up. We also utilized a subsample of 90 […]
Related Product: Actiheart
Publication Date: April 8, 2021
Comparison of Energy Expenditure Observed between Scheduled Activities in Collegiate Team-Sport Female Athletes
Energy needs of female team-sport athletes are poorly understood with no evidence highlighting differences present between scheduled activities. The purpose of this study was to examine the difference in energy expenditure between NCAA Division II female basketball (BBALL) and lacrosse (LAX) athletes during different scheduled team activities. Female BBALL (n = 13; 19.8 ± 1.3 […]
Related Product: Actiheart
Publication Date: April 2, 2021
Joint associations between objectively measured physical activity volume and intensity with body-fatness. The Fenland Study
Background/Objectives Physical activity energy expenditure (PAEE) represents the total volume of all physical activity. This can be accumulated as different underlying intensity profiles. Although volume and intensity have been studied in isolation, less is known about their joint association with health. We examined this association with body-fatness in a population-based sample of middle-aged British women […]
Related Product: Actiheart
Publication Date: March 28, 2021
Testosterone and exercise: Effects on fitness, body composition and strength in middle-to-older aged men with low-normal serum testosterone levels
As men age, serum testosterone (T) concentrations decrease, as do fitness, strength and lean mass. Whether testosterone treatment confers additive benefit to reverse these changes when combined with exercise training in middle-to-older aged men remains unclear. We assessed the effects of T treatment and exercise, alone and in combination, on aerobic capacity (VO2peak), body composition […]
Related Product: Actiheart
Publication Date: March 19, 2021
Resting skeletal muscle ATGL and CPT1b are associated with peak fat oxidation rates in men and women but do not explain observed sex‐differences
We explored key proteins involved in fat metabolism that might be associated with peak fat oxidation (PFO) and account for sexual dimorphism in fuel metabolism during exercise. Thirty‐six healthy adults [15 women; 40 ± 11 years of age; peak oxygen consumption 42.5 ± 9.5 ml (kg body mass)–1 min–1; mean ± SD] completed two exercise […]
Related Product: Actiheart
Publication Date: March 6, 2021
Effects of gastric bypass surgery on the brain; simultaneous assessment of glucose uptake, blood flow, neural activity and cognitive function during normo-and hypoglycemia
While Roux-en-Y Gastric Bypass (RYGB) surgery in obese individuals typically improves glycemic control and prevents diabetes, it also frequently causes hypoglycemia. Previous work showed attenuated counter-regulatory responses following RYGB. The underlying mechanisms as well as the clinical consequences are unclear.In this study, 11 non-diabetic subjects with severe obesity were investigated pre- and post-RYGB during hyperinsulinemic […]
Related Product: Actiheart
Publication Date: March 4, 2021
Decreased energy availability during training overload is associated with non-functional overreaching and suppressed ovarian function in female runners
Low energy availability (EA) suppresses many physiological processes, including ovarian function in female athletes. Low EA could also predispose athletes to develop a state of overreaching. This study compared the changes in ad libitum energy intake (EI), exercise energy expenditure (ExEE), and EA among runners completing a training overload (TO) phase. We tested the hypothesis […]
Related Product: Actiheart
Publication Date: March 2, 2021
Changes in Energy Expenditure, Dietary Intake, and Energy Availability Across an Entire Collegiate Women’s Basketball Season
The purpose of this study was to identify changes in energy expenditure and dietary intake across an entire women’s basketball season. On 5 different occasions across the competitive season, female collegiate basketball players (19.8 ± 1.3 years, 173.9 ± 13.6 cm, 74.6 ± 9.1 kg, 27.1 ± 3.2% fat, 53.9 ± 6.4 ml·kg−1·min−1, n = […]
Related Product: Actiheart
Publication Date: March 1, 2021
Effect of Cognitive Fatigue, Operator Sex, and Robot Assistance on Task Performance Metrics, Workload, and Situation Awareness in Human-Robot Collaboration
Advancements in robot technology are allowing for increasing integration of humans and robots in shared space manufacturing processes. While individual task performance of the robotic assistance and human operator can be separately optimized, the interaction between humans and robots can lead to emergent effects on collaborative performance. Thus, the performance benefits of increased automation in […]
Related Product: Actiheart
Publication Date: March 1, 2021
Associations of physical activity, sedentary time, and diet quality with biomarkers of inflammation in children
We investigated the associations of physical activity (PA), sedentary time (ST), and diet quality with biomarkers of inflammation in 390 children (192 girls, 198 boys) aged 6–8 years. PA energy expenditure (PAEE), light PA, moderate PA (MPA), vigorous PA (VPA), moderate-to-vigorous PA (MVPA), and ST were assessed by combined movement and heart rate sensor. Finnish […]
Related Product: Actiheart
Publication Date: February 19, 2021
A Stress Syndrome Prototype Reflects Type 3 Diabetes and Ischemic Stroke Risk: The SABPA Study
Type 3 diabetes (T3D) accurately reflects that dementia, e.g., Alzheimer’s disease, represents insulin resistance and neurodegeneration in the brain. Similar retinal microvascular changes were observed in Alzheimer’s and chronic stressed individuals. Hence, we aimed to show that chronic stress relates to T3D dementia signs and retinopathy, ultimately comprising a Stress syndrome prototype reflecting risk for […]
Related Product: Actiheart
Publication Date: February 18, 2021
Effect of high‐intensity interval training on cardiometabolic component risks in persons with paraplegia: Protocol for a randomized controlled trial
Individuals with a spinal cord injury (SCI) are at an increased risk of developing cardiovascular disease and present with a multitude of elevated cardiometabolic component risks. Although upper‐body exercise appears an effective strategy to improve some of these outcomes, the effectiveness of high‐intensity interval training (HIIT) has yet to be determined for this population. Therefore, […]
Related Product: Actiheart
Publication Date: February 18, 2021
Effectiveness of Minimal Contact Interventions: An RCT
Introduction Around 23% of adults worldwide are insufficiently active. Wearable devices paired with virtual coaching software could increase physical activity. The effectiveness of 3 minimal contact interventions (paper-based physical activity diaries, activity trackers, and activity trackers coupled with virtual coaching) in increasing physical activity energy expenditure and cardiorespiratory fitness were compared over 12 weeks among […]
Related Product: Actiheart
Publication Date: February 18, 2021
Independent and combined associations between fast-food outlet exposure and genetic risk for obesity: a population-based, cross-sectional study in the UK
Background Characteristics of the built environment, such as neighbourhood fast-food outlet exposure, are increasingly recognised as risk factors for unhealthy diet and obesity. Obesity also has a genetic component, with common genetic variants explaining a substantial proportion of population-level obesity susceptibility. However, it is not known whether and to what extent associations between fast-food outlet […]
Related Product: Actiheart
Publication Date: February 15, 2021
Determinants of peak fat oxidation rates during cycling in healthy men and women
This study explored lifestyle and biological determinants of peak fat oxidation (PFO) during cycle ergometry, using duplicate measures to account for day-to-day variation. Seventy-three healthy adults (age range: 19–63 years; peak oxygen consumption [˙VO2peak]:42.4[10.1]ml⋅kgBM−1⋅min−1; n = 32 women]) completed trials 7–28 days apart that assessed resting metabolic rate, a resting venous blood sample, and PFO by indirect calorimetry during […]
Related Product: Actiheart
Publication Date: February 14, 2021
Isotemporal Substitution of Time Between Sleep and Physical Activity: Associations With Cardiovascular Risk Factors in Early Rheumatoid Arthritis
Objective We aimed to determine relationships between objectively measured nightly sleep, sedentary behavior (SB), light physical activity (LPA), and moderate to vigorous physical activity (MVPA) with risk factors for cardiovascular disease (CVD) in patients with early rheumatoid arthritis (RA). Furthermore, we aimed to estimate consequences for these risk factors of theoretical displacements of 30 minutes […]
Related Product: Actiheart
Publication Date: February 11, 2021
The independent and interactive associations of physical activity intensity and vitamin D status with bone mineral density in prepubertal children: the PANIC Study
Summary It is unclear how physical activity intensity and vitamin D status are related to bone health in prepubertal children. We found positive associations between vitamin D status and moderate-to-vigorous physical activity with bone in boys and girls. This highlights the importance of lifestyle factors for skeletal health prepuberty. Introduction The sex-specific independent and interactive […]
Related Product: Actiheart
Publication Date: February 5, 2021
Wearable Devices Suitable for Monitoring Twenty Four Hour Heart Rate Variability in Military Populations
Heart rate variability (HRV) measurements provide information on the autonomic nervous system and the balance between parasympathetic and sympathetic activity. A high HRV can be advantageous, reflecting the ability of the autonomic nervous system to adapt, whereas a low HRV can be indicative of fatigue, overtraining or health issues. There has been a surge in […]
Related Product: Actiheart
Publication Date: February 4, 2021
β-Lactoglobulin Elevates Insulin and Glucagon Concentrations Compared with Whey Protein—A Randomized Double-Blinded Crossover Trial in Patients with Type Two Diabetes Mellitus
Whey protein is an insulinotropic fraction of dairy that reduces postprandial glucose levels in patients with type 2 diabetes mellitus (T2DM). We have recently shown that β-lactoglobulin (BLG), the largest protein fraction of whey, elevates insulin concentrations compared with iso-nitrogenous whey protein isolate (WPI) in healthy individuals. We therefore hypothesized that BLG pre-meals would lower […]
Related Product: Actiheart
Publication Date: January 22, 2021
Measuring Physical Activity Levels During instructional Settings for Children with Autism Spectrum Disorder
A growing number of children with autism spectrum disorder (ASD) may not possess the motor skills needed to be physically active. In order to address these needs, Camp Nugget is held each summer with the goal of providing quality individualized physical activity instruction to children with disabilities 5 through 12 years of age. The program […]
Related Product: Actiheart
Publication Date: January 1, 2021
Physiological Data Models to Understand the Effectiveness of Drone Operation Training in Immersive Virtual Reality
Data collection using unmanned aerial vehicles (UAVs) in construction and heavy civil projects is subject to compliance with strict operational rules and safety regulations. Both the US Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) require drone operators to keep the drone in sight and avoid flying near people or other […]
Related Product: Actiheart
Publication Date: January 1, 2021
Variation in Heart-Rate Profile During a Prolonged, Submaximal Swim Bout
Purpose: To describe the heart-rate (HR) response during a prolonged, submaximal, multirepetition swimming bout (ie, typical early-season swimming training), as there is currently little or no literature on this topic. Methods: A total of 12 collegiate swimmers were instructed to complete sixty 91.4-m (100-yd) freestyle repetitions at their fastest sustainable pace, allowing between 5 and […]
Related Product: Actiheart
Publication Date: December 16, 2020
Day and night changes in energy expenditure of patients on automated peritoneal dialysis
Rationale Automated peritoneal dialysis (APD) treatment for end-stage kidney disease affords patients a degree of autonomy in everyday life. Clinical investigations of their energy expenditure (EE) are usually based on resting EE, which could mask day and night variations in EE. The aim of this study, therefore, was to compare the components of EE in […]
Related Product: Actiheart
Publication Date: November 28, 2020
Cognitive dietary restraint score is associated with lower energy, carbohydrate, fat, and grain intake among female adolescent endurance runners
This cross-sectional study investigated associations between cognitive dietary restraint (CDR), energy, macronutrient and food group intake, menstrual function, and bone density in female adolescent endurance runners. Participants were forty female adolescent endurance runners. The independent variable was CDR, as assessed by the Three Factor Eating Questionnaire (TFEQ). Runners with CDR subscale scores ≥11 were classified […]
Related Product: Actiheart
Publication Date: November 25, 2020
Cardiovascular responses to stress utilizing anticipatory singing tasks
Models of psychobiological stress reactivity have a foundation in the measurement of responses to standardized stress tasks. Tasks with anticipatory phases have been proposed as an effective method of stress induction, either as a stand-alone task or replacement constituent elements for existing stressor paradigms. Tasks utilizing singing as a primary stressor have been proposed but […]
Related Product: Actiheart
Publication Date: November 16, 2020
The relationship of sleep duration and quality to energy expenditure and physical activity in children
Background Shorter sleep duration has been linked to the risk for obesity in children. The pathways linking sleep duration and quality to the risk of obesity are unclear, particularly the effect of sleep on energetics. Objective We investigated the relationship between sleep duration, quality and timing in children, to the basal metabolic rate (BMR), total […]
Related Product: Actiheart
Publication Date: November 15, 2020
Effects of Inspiratory Muscle Training on Heart Rate Variability in Children with Cystic Fibrosis: A Pilot Study
Purpose Cystic Fibrosis (CF) is a multisystem disease associated with symptoms such as dyspnoea, tachycardia and tachypnea that may be related to changes in autonomic function and sensitive to improvement following inspiratory muscle training (IMT). The aim of the present study was to investigate the effect of IMT on heart rate variability (HRV) and respiratory […]
Related Product: Actiheart
Publication Date: November 9, 2020
Cardiorespiratory fitness, occupational aerobic workload and age: workplace measurements among blue-collar workers
Background The knowledge, from laboratory studies dating back to the 1950s on the importance of the association between cardiorespiratory fitness and aerobic workload for workers health, is fundamental for promoting sustainable healthy employability among ageing blue-collar workers today. However, the association between cardiorespiratory fitness and aerobic workload has not yet been documented during daily work, […]
Related Product: Actiheart
Publication Date: November 8, 2020
Physiological Data Models to Understand the Effectiveness of Drone Operation Training in Immersive Virtual Reality
Data collection using unmanned aerial vehicles (UAVs) in construction and heavy civil projects is subject to compliance with strict operational rules and safety regulations. Both the US Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) require drone operators to keep the drone in sight and avoid flying near people or other […]
Related Product: Actiheart
Publication Date: October 29, 2020
The Psychological and Physiological Consequences of Low Energy Availability in a Male Combat Sport Athlete
Purpose: To evaluate the effects of low energy availability (EA) on health and performance indices associated with the Male Athlete Triad and Relative Energy Deficiency in Sports (RED-S) models. Methods: Over an 8 week period, a male combat sport athlete adhered to a phased body mass (BM) loss plan consisting of 7 weeks energy intake […]
Related Product: Actiheart
Publication Date: October 22, 2020
Towards a Closed-Loop Neurostimulation Platform for Augmenting Operator Vigilance
Vigilance is a primary job-performance requirement for human operators in domains that demand sustained attention, including air traffic control (ATC), surveillance, emergency response and many others. In this pilot study we introduce the prerequisites and conditions that facilitate a novel closed-loop, adaptive neurostimulation system to alleviate vigilance decrements during prolonged time-on-task efforts. Here, we investigate […]
Related Product: Actiheart
Publication Date: October 11, 2020
The influence of low-intensity resistance training combined with neuromuscular electrical stimulation on autonomic activity in healthy adults: A randomized controlled cross-over trial
Background: Low-intensity resistance training (RT) combined with neuromuscular electrical stimulation (NMES) is one method of exercise to improve the deterioration of physical function. However, it is unclear whether low-intensity RT combined with NMES (RT + NMES) can be safely implemented. Objective: This study aimed to examine the influence of low-intensity RT + NMES on autonomic […]
Related Product: Actiheart
Publication Date: September 30, 2020
Test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities
The current study determined the test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities. Before filling in the Adapted-SQUASH twice with a recall period of two weeks, participants wore the Actiheart activity monitor up to one week. For the test-retest reliability (N=68), Intraclass correlation […]
Related Product: Actiheart
Publication Date: September 9, 2020
Determinants of physical activity in young wheelchair-user with spina bifida
Objective: To explore associations between physical activity and peak oxygen uptake (VO2peak), age, sex, and Hoffer classification in young wheelchair-users with spina bifida. Design: Exploratory study. Subjects: Dutch children (age 5-19 years) with spina bifida who use a manual wheelchair. Methods: For the dependent variable physical activity, data from 2 physical activity monitors were analysed: […]
Related Product: Actiheart
Publication Date: August 17, 2020
Active women demonstrate acute autonomic and hemodynamic shifts following exercise in heat and humidity: A pilot study
The purpose of this study was to assess autonomic and hemodynamic recovery in women who performed moderate-intensity exercise in heat. Seven women (31.7 ± 7.6 years, 67.5 ± 4.4 kg, 25.7 ± 5.6% Fat, 43.9 ± 5.1 mL/kg/min) completed two identical bouts of graded treadmill walking (~60% VO2peak). One bout was hot (37.5 ± 1.4°C, […]
Related Product: Actiheart
Publication Date: August 4, 2020
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