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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Association between circulating 25-hydroxyvitamin D and cardiometabolic risk factors in adults in rural and urban settings
Background An inverse association between vitamin D status and cardiometabolic risk has been reported but this relationship may have been affected by residual confounding from adiposity and physical activity due to imprecise measures of these variables. We aimed to investigate the relationship between serum 25-hydroxyvitamin D (25(OH)D) and cardiometabolic risk factors, with adjustment for objectively-measured […]
Related Product: Actiheart
Publication Date: July 29, 2022
Associations between Saliva Alpha-Amylase, Heart Rate Variability, Saliva Cortisol and Cognitive Performance in Individuals at Ultra High-Risk for Psychosis
Background: Cognitive impairments are present in individuals at ultra-high risk (UHR) of psychosis and UHR individuals exhibit a hyperactive and dysfunctional HPA-axis. Increasing stress levels could potentially lead to cognitive impairments and no previous studies have examined the association between physiological stress biomarkers and cognition in UHR individuals. This study aims to examine the association […]
Related Product: Actiheart
Publication Date: July 26, 2022
The relationship between cardiac damage biomarkers and heart rate variability following 60 min of running
Purpose Endurance exercise may cause transient alterations in cardiac tissue. The number of studies evaluating the relationship between changes in heart rate variability (HRV) and cardiac biomarkers following an endurance event is limited. We hypothesized that there would be a time-dependent correlation between biomarkers of cardiac damage and the reduction in parasympathetic indices of HRV […]
Related Product: Actiheart
Publication Date: July 25, 2022
Acute appetite and eating behaviour responses to apparatus-free, high-intensity intermittent exercise in inactive women with excess weight
High-intensity intermittent exercise (HIIE) has been shown to transiently suppress appetite, but such exercise has traditionally required the use of specialist apparatus (e.g., cycle ergometer). This study aimed to determine appetite and eating behaviour responses to acute apparatus-free HIIE in inactive women with excess weight. A preliminary study (n = 18 inactive women, 9 healthy […]
Related Product: Actiheart
Publication Date: July 18, 2022
Prenatal Cortisol Levels Estimation Using Heart Rate and Heart Rate Variability: A Weak Supervised Learning Based Approach
Cortisol is a steroid hormone that regulates a wide range of vital signs throughout the body. However, current cortisol monitoring methods are inconvenient for everyday settings. Heart Rate (HR) and Heart Rate Variability (HRV) are easily collected biological parameters whose fluctuations highly correlate with cortisol, however, there does not exist a work attempting to estimate […]
Related Product: Actiheart
Publication Date: July 15, 2022
The Role of Sleep and Eating Patterns in Adiposity Gain among Preschool-Aged Children
Background Short sleep duration is related to risk for obesity in preschool children. However, the underlying mechanism(s) are not clear. Objective We evaluated the relationship between sleep characteristics with body composition, energetics and weight-regulating behaviors in preschool-aged children; and the longitudinal associations between children’s sleep and eating patterns with body composition at 1-year follow-up. Methods […]
Related Product: Actiheart
Publication Date: July 14, 2022
Heart Rate Variability Biofeedback to treat Anxiety in Young People with Autistic Spectrum Disorder: findings from a home-based pilot study
Background: Young people with Autistic Spectrum Disorders (ASD) frequently experience high levels of anxiety. Despite this, many clinical settings do not provide specialist ASD mental health services and demand for professional support frequently outstrips supply. Across many sectors of health, investigators have explored digital health solutions to mitigate demand and extend the reach of professional […]
Related Product: Actiheart
Publication Date: June 30, 2022
Energy expenditure and time spent on physical activity in Costa Rican schoolchildren with overweight or obesity by means of the Actiheart accelerometer
Objective: To determine the energy expenditure and time spent on physical activities in Costa Rican overweight or obese schoolchildren in free-living conditions. Methodology: Participants were 31 boys and 13 girls aged 6 to 9 years old (7.6 ± 1.03 years) with overweight or obesity; nutritional status was established by BMI. The variables of the study […]
Related Product: Actiheart
Publication Date: June 1, 2022
Cognition and Music Performance
Because it involves a host of different perceptions, concepts and practices that are linked to particular social considerations, research in music is multifaceted and varied (Cross, 2001). The understanding of music cognition requires the contributions of psychological, neuropsychological, social, cultural, and educational perspectives to provide a full approximation to the phenomenon. Psychological and neuropsychological studies […]
Related Product: Actiheart
Publication Date: June 1, 2022
The relationship between physical activity, body fatness and metabolic syndrome in urban South African school teachers: The sympathetic activity and ambulatory blood pressure in Africans study
Background: Globally, the prevalence of metabolic syndrome (MS) is rising because of increased levels of physical inactivity and obesity. In South Africa, information about teachers’ physical activity (PA), body fatness and MS is limited. Aim: To assess the relationship between PA, body fatness and MS in urban South African teachers. Setting: The study setting was […]
Related Product: Actiheart
Publication Date: May 30, 2022
Dynamics of metabolic rate in male individuals due to the meal and regular office activities
Metabolic rate is one of the main parameters affecting the thermal balance of the human body and perception of thermal comfort. Typically, we consider a constant value for a specific type of activity (sitting quiet, standing, etc.) despite the time of the day and body built of a person. In this study, we challenged this […]
Related Product: Actiheart
Publication Date: May 25, 2022
Device-measured sleep onset and duration in the development of depressive symptoms in adolescence
Background Sleep deprivation in adolescence is increasing in prevalence and may be linked to subsequent depression. Findings regarding associations between sleep duration, sleep onset time, and the development of depressive symptoms over time in adolescents are mixed, and rely on subjective measures of sleep. Methods Sleep onset and duration were assessed using a combined heart […]
Related Product: Actiheart
Publication Date: May 17, 2022
A window into the tired brain: neurophysiological dynamics of visuospatial working memory under fatigue
Objective We examine the spatiotemporal dynamics of neural activity and its correlates in heart rate and its variability (HR/HRV) during a fatiguing visuospatial working memory task. Background The neural and physiological drivers of fatigue are complex, coupled, and poorly understood. Investigations that combine the fidelity of neural indices and the field-readiness of physiological measures can […]
Related Product: Actiheart
Publication Date: May 14, 2022
Studies of twin responses to understand exercise THerapy (STRUETH): Cerebrovascular function
We studied monozygotic (MZ) and dizygotic (DZ) twin pairs following resistance (RES) and endurance (END) training to assess genetic and environmental contributions to cerebrovascular function. Cerebrovascular function (rest, autoregulation, hypercapnia, exercise) was assessed in 86 healthy same-sex MZ (30 pairs) and DZ (13 pairs) twins, who underwent 3 months of END and RES. Carbon dioxide […]
Related Product: Actiheart
Publication Date: May 13, 2022
Longitudinal associations of absolute versus relative moderate-to-vigorous physical activity with brain microstructural decline in aging
Higher moderate-to-vigorous intensity (MVPA) may preserve brain structural integrity, but evidence is mostly cross-sectional and relies on absolute PA measures. We examined longitudinal associations of absolute MVPA using population-level activity count thresholds and relative MVPA using individual heart rate reserve (HRR) via Actiheart with subsequent changes in brain diffusion tensor imaging (DTI) over average of […]
Related Product: Actiheart
Publication Date: May 8, 2022
Longitudinal cardio-respiratory fitness prediction through free-living wearable sensors
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 response to a standard exercise test. However, such testing is costly and burdensome, limiting its utility and scalability. Fitness can also be approximated using resting heart rate and self-reported […]
Related Product: Actiheart
Publication Date: May 6, 2022
The Effect of Assessor Presence on Stress and Anxiety Experienced During Clinical Simulation-Based Assessment
Background: Emergency medical care (EMC) has been recognised as an important sector within public health care by the World Health Organisation. Emergency medical care refers to the provision of initial resuscitation, stabilisation, and treatment to acutely ill and injured patients and delivering those patients to the best available definitive care (AFEM Consensus Conference, 2013). As […]
Related Product: Actiheart
Publication Date: May 1, 2022
Soluble (Pro) renin Receptor Is Adversely Associated with Indices of Left Ventricular Structure and Function: The African-PREDICT Study
This study aims to compare soluble (pro)renin receptor [s(P)RR] levels between black and white adults and to explore the associations of left ventricular (LV) structure and function with s(P)RR in the total and ethnicity-stratified groups. The study sample included 1172 apparently healthy black (n = 587) and white (n = 585) participants of the African-PREDICT […]
Related Product: Actiheart
Publication Date: April 25, 2022
Is the skull responsive to bone mineralisation stimuli in children?
Background Whole-body-less-head (WBLH) is the recommended skeletal region of interest (ROI) for dual-energy X-ray absorptiometry (DXA) assessment of bone mineral density (BMD) in children. Historically it has been suggested that the skull is less responsive than the rest of the skeleton to stimuli that affect BMD but there are few published data to support this […]
Related Product: Actiheart
Publication Date: April 12, 2022
Breastfeeding is related to atypical autonomic and behavior regulation in infants with a history of excessive crying
The study investigated autonomic regulation during feeding in six-month old infants with a history of excessive crying (EC) and social-behavioral development at 12 and 24 months. When contrasted with non-EC infants (NEC), EC infants had atypical autonomic responses observed as dampened reductions in respiratory sinus arrhythmia (RSA) and decreases in heart period (HP) during feeding. […]
Related Product: Actiheart
Publication Date: April 11, 2022
The influence of clinic care on perceptions and knowledge of non-communicable diseases and physical activity from a low-resourced community: a mixed-method study
Background Health promotion for the management of risk factors for non-communicable diseases (NCDs) is an integral part of standard care in South Africa. Most persons presenting with NCDs utilise public primary health care centres for disease management. This mixed-methods study aimed at expanding current understanding of the the influence of standard clinic care (usual care) […]
Related Product: Actiheart
Publication Date: April 7, 2022
An Exploratory Study on the Physical Activity Health Paradox—Musculoskeletal Pain and Cardiovascular Load during Work and Leisure in Construction and Healthcare Workers
Using a novel approach, this exploratory study investigated whether the physical activity (PA) paradox extends to cardiovascular load and musculoskeletal pain. At baseline, 1–2 days of 24 h heart rate was assessed in 72 workers from construction and healthcare. Workers then reported pain intensity in 9 body regions (scale 0–3) every 6 months for two […]
Related Product: Actiheart
Publication Date: March 26, 2022
Exercise Intervention Changes the Perceptions and Knowledge of Non-Communicable Disease Risk Factors among Women from a Low-Resourced Setting
We employed the Health Belief Model (HBM) as a theoretical lens to explore the influence of an exercise intervention on the perceptions and knowledge of modifiable risk factors for non-communicable diseases (NCDs) among women from a low-resource setting in South Africa. We used a mixed-methods design, gathering qualitative and quantitative data at baseline (n = […]
Related Product: Actiheart
Publication Date: March 15, 2022
Intensity of occupational physical activity in blue-collar workers: do self-reported rating and device-worn measurements agree?
Purpose High intensity occupational physical activity (OPA) seem to aggravate health and increase risk of sick leave and early retirement. Most intensity of OPA monitoring has been self-reported, e.g. by rating of perceived exertion (RPE). However, no studies have investigated the precision and risk of bias in RPE reporting during free-living OPA. This study investigated […]
Related Product: Actiheart
Publication Date: March 10, 2022
Health‐related quality of life for normal glycaemia, prediabetes and type 2 diabetes mellitus: cross‐sectional analysis of the ADDITION‐PRO study
Aims We estimated and compared health-related quality of life for individuals with normal glucose tolerance, prediabetes and diabetes. Methods Participants in the ADDITION-PRO study, Denmark, who attended a health assessment between 2009 and 2011, and who completed the 3-level EuroQoL 5-dimensions (EQ-5D-3L) questionnaire were included. For the present study, they were classified as normal glucose […]
Related Product: Actiheart
Publication Date: March 6, 2022
Descriptive epidemiology of cardiorespiratory fitness in UK adults: The Fenland Study
Background Cardiorespiratory fitness is rarely measured in population studies. Most studies of fitness do not examine differences by population subgroups or seasonal trends. Methods We used a validated submaximal exercise test to measure fitness in 5976 women and 5316 men, residing in England. We expressed fitness as maximal oxygen consumption per kilogram total body mass […]
Related Product: Actiheart
Publication Date: March 1, 2022
Parasympathetic regulation in the classroom differentially predicts preschoolers’ socially competent behaviors
Research shows that children’s early social competence predicts their later academic and interpersonal success. Accordingly, early childhood education programs increasingly aim to evaluate and support children’s social skill development. Despite ample theoretical and empirical work demonstrating the role of the parasympathetic nervous system (PNS) in supporting neurophysiological processes that underlie social behaviors, no study has […]
Related Product: Actiheart
Publication Date: February 20, 2022
The association of sickle‐cell trait with β‐cell dysfunction and physical activity in adults living with and without HIV in Tanzania
This study aimed to investigate sickle cell trait (SCT) associations with physical activity, markers of insulin secretion and resistance, and glucose among people living with HIV infection (PLWH), both antiretroviral therapy (ART) naive and experienced, and HIV-uninfected adults. This was a cross-sectional study conducted in Mwanza, Northwestern Tanzania. We used data of 668 participants attained […]
Related Product: Actiheart
Publication Date: February 15, 2022
Lipid-based nutrient supplement at initiation of antiretroviral therapy does not substitute energy from habitual diet among HIV patients–a secondary analysis of data from a randomised controlled trial in Ethiopia
Introduction Malnutrition is common among people with HIV in sub-Saharan Africa. Nutritional supplementation at initiation of antiretroviral treatment (ART) has shown beneficial effects, but it is not known if supplementation replaces or supplements the habitual energy intake in a context of food insecurity. Methods As part of a randomised controlled trial among people with HIV […]
Related Product: Actiheart
Publication Date: February 11, 2022
Long-term evolution of N-terminal pro-brain natriuretic peptide levels and exercise capacity in 132 left ventricular assist device recipients
OBJECTIVES N-terminal pro-brain natriuretic peptide (NT-proBNP) is a widely used biomarker in clinical practice in the context of heart failure. Little is known about the long-term evolution of NT-proBNP levels in left ventricular assist device (LVAD) recipients. Besides this, the potential correlation of NT-proBNP with exercise capacity on the long term after LVAD implantation has […]
Related Product: Actiheart
Publication Date: February 10, 2022
Obesity due to Steroid Receptor Coactivator-1 deficiency is associated with endocrine and metabolic abnormalities
Context Genetic variants affecting the nuclear hormone receptor coactivator Steroid Receptor Coactivator, SRC-1, have been identified in people with severe obesity and impair melanocortin signaling in cells and mice. As a result, obese patients with SRC-1 deficiency are being treated with a Melanocortin 4 receptor agonist in clinical trials. Objective Here, our aim was to […]
Related Product: Actiheart
Publication Date: February 8, 2022
Assessment of activity energy expenditure during competitive golf: The effects of bag carrying, electric or manual trolleys
Golf is a sport played around the globe, with an estimated 42.6 million people playing within the United Kingdom and United States of America alone. To date there is limited data on the energy expenditure of golf. The present study assessed the activity energy expenditure (AEE) of 16 high-standard (handicap under 5) golfers who completed […]
Related Product: Actiheart
Publication Date: January 30, 2022
Levels and correlates of physical activity and capacity among HIV-infected compared to HIV-uninfected individuals
Introduction In the HIV-infected individuals, physical activity improves physical strength, quality of life and reduces the risk of developing non-communicable diseases. In Sub-Saharan Africa, HIV-infected patients report being less active compared to HIV-uninfected individuals. We assessed the levels and correlates of objectively measured physical activity and capacity among HIV-infected antiretroviral therapy (ART)-naive individuals compared to […]
Related Product: Actiheart
Publication Date: January 21, 2022
Emotion Dysregulation and Heart Rate variability Improve in US Veterans Undergoing Treatment for Posttraumatic Stress Disorder: Secondary Exploratory Analyses from a Randomised Controlled Trial
Background: Emotion regulation (ER) is a key process underlying posttraumatic stress disorder (PTSD), yet, little is known about how ER changes with PTSD treatment. Understanding these effects may shed light on treatment processes. Methods. We recently completed a randomised controlled trial demonstrating that a breathing-based yoga practice (Sudarshan kriya yoga; SKY) was not clinically inferior […]
Related Product: Actiheart
Publication Date: January 10, 2022
Physical Activity and Dietary Composition Relate to Differences in Gut Microbial Patterns in a Multi-Ethnic Cohort —The HELIUS Study
Physical activity (PA) at recommended levels contributes to the prevention of non-communicable diseases, such as atherosclerotic cardiovascular disease (asCVD) and type 2 diabetes mellitus (T2DM). Since the composition of the gut microbiota is strongly intertwined with dietary intake, the specific effect of exercise on the gut microbiota is not known. Moreover, multiple other factors, such […]
Related Product: Actiheart
Publication Date: December 9, 2021
Correlations Between Physical Activity Level, Quality of Life, and Cognitive Performance in Elderly Individuals Engaging in Multi-Year Dance Activities
Introduction: It is well-acknowledged that cognitive and physical decline associated with aging can be prevented or reduced with the engagement in regular physical activity (PA). Dance activities combine cardiovascular, cognitive, and coordinative demands, providing a popular leisure PA among elderly. This study examined the correlations between quality of life (QoL), cognitive and physical performance, and […]
Related Product: Actiheart
Publication Date: December 5, 2021
Is there an association between socioeconomic status and the degree of diurnal variation in heart rate?
Background Disruption in circadian rhythms is associated with cardiovascular disease and may play a role in socioeconomic differences in cardiovascular disease prevalence. However, it is unclear whether low SES is associated with a lower diurnal rhythm in autonomic activity markers. We investigated the association between SES and the amplitude of the daily fluctuation of heart […]
Related Product: Actiheart
Publication Date: November 27, 2021
Breakfast Consumption Suppresses Appetite but Does Not Increase Daily Energy Intake or Physical Activity Energy Expenditure When Compared with Breakfast Omission in Adolescent Girls Who Habitually Skip Breakfast: A 7-Day Randomised Crossover Trial
With concerns that adolescent girls often skip breakfast, this study compared the effects of breakfast consumption versus breakfast omission on free-living physical activity (PA) energy expenditure (PAEE) and dietary intakes among adolescent girls classified as habitual breakfast skippers. The participants went through two 7-day conditions in a trial with a crossover design: daily standardised breakfast […]
Related Product: Actiheart
Publication Date: November 26, 2021
Association of Combined Slow Gait and Low Activity Fragmentation With Later Onset of Cognitive Impairment
Importance: Among older people, slow walking is an early indicator of risk for Alzheimer disease (AD). However, studies that have assessed this association have not considered that slow walking may have different causes, some of which are not necessarily associated with higher AD risk. Objective: To evaluate whether low activity fragmentation among older adults with […]
Related Product: Actiheart
Publication Date: November 18, 2021
Infant physiological activity and the early emergence of social communication
Early in life, social engagement is facilitated by effective regulation during times of rest and stress. Physiological regulation during social play and in response to sudden environmental changes or social stressors may play an important role in sustaining social engagement in infancy and facilitate the acquisition of early social-communication skills. The aim of this study […]
Related Product: Actiheart
Publication Date: November 1, 2021
The use of Multi-Sensory Environments with autistic children: Exploring the effect of having control of sensory changes
Multi-Sensory Environments (also called sensory or Snoezelen® rooms) are specialised spaces that contain equipment to modify the environment. They are commonly used in special-needs schools with autistic children, but empirical investigation into how to best use Multi-Sensory Environments with autistic children has been limited. Based on converging evidence that autistic children may benefit from having […]
Related Product: Actiheart
Publication Date: October 24, 2021
Longitudinal and cross‐sectional associations of adherence to 24‐hour movement guidelines with cardiometabolic risk
This study aimed to examine (1) adherence to 24 h movement guidelines over a 2 years follow-up in children aged 6–8 years and (2) association of this adherence with cardiometabolic risk factors. Physical activity and sleep were assessed by a monitor combining heart rate and accelerometry measurements. Screen time was reported by the parents. Body […]
Related Product: Actiheart
Publication Date: October 13, 2021
Rheumatoid cachexia in early rheumatoid arthritis: prevalence and associated variables
Objective Rheumatoid cachexia (RC) is prevalent among patients with established rheumatoid arthritis (RA). Although changes in muscle mass and fat mass have been reported in early RA, these findings have not been classified according to existing RC definitions. This study aimed to describe the prevalence of RC and associated variables in patients with early RA. […]
Related Product: Actiheart
Publication Date: October 13, 2021
Resistance but not endurance exercise training induces changes in cerebrovascular function in healthy young subjects
It is generally considered that regular exercise maintains brain health and reduces the risk of cerebrovascular diseases such as stroke and dementia. Since the benefits of different “types” of exercise are unclear, we sought to compare the impacts of endurance and resistance training on cerebrovascular function. In a randomized and crossover design, 68 young healthy […]
Related Product: Actiheart
Publication Date: October 11, 2021
Heart Rate Variability and Muscle Strength in Young Adults with Sedentary Behaviour
Introduction: Sedentary behaviour or physical inactivity has been relatively prevalent among young adults globally. Multiple studies pointed out that Malaysia has been listed as one of the Asian countries with high prevalence of inactivity. Objective: This study aimed to examine the heart rate variability (HRV) and muscle strength among young adults in order to identify […]
Related Product: Actiheart
Publication Date: September 30, 2021
Omega-3 supplementation during unilateral resistance exercise training in older women: a within subject and double-blind placebo-controlled trial
Background & aims The skeletal muscle anabolic effects of n-3 polyunsaturated fatty acids (n-3 PUFA) appear favoured towards women; a property that could be exploited in older women who typically exhibit poor muscle growth responses to resistance exercise training (RET). Here we sought to generate novel insights into the efficacy and mechanisms of n-3 PUFA […]
Related Product: Actiheart
Publication Date: September 29, 2021
Infants’ physiological and behavioral reactivity to maternal mobile phone use–An experimental study
The present study examined the impact of maternal mobile phone use during mother-child interaction on infants’ physiological and behavioral reactivity (i.e., heart rate and negative affect). In this experimental study, 106 mother-infant (M age = 11.88 months; 51% male) dyads were randomly assigned to one of three experimental conditions. All conditions started and ended with […]
Related Product: Actiheart
Publication Date: September 28, 2021
Anodal tDCS augments and preserves working memory beyond time-on-task deficits
Transcranial direct current stimulation (tDCS) of the left dorsolateral prefrontal cortex (DLPFC) has been shown to promote working memory (WM), however, its efficacy against time-on-task-related performance decline and associated cognitive fatigue remains uncertain. This study examined the impact of anodal tDCS of the left DLPFC on performance during a fatiguing visuospatial WM test. We adopted […]
Related Product: Actiheart
Publication Date: September 27, 2021
Light-intensity physical activity and mental ill health: a systematic review of observational studies in the general population
Background Most of the evidence has focused on examining the influence of moderate-to-vigorous intensity physical activity on mental health, but he role of light intensity physical activity (LIPA) is less understood. The purpose of this systematic review was to assess the relationship between time spent in LIPA and mental ill health across the lifespan. Methods […]
Related Product: Actiheart
Publication Date: September 15, 2021
Exploring the Effect of Long Naps on Handball Performance and Heart Rate Variability
This study explored the effect of long naps on handball-related performance and assessed the role of the cardiac autonomic nervous system in this process. Eleven male collegiate handball players performed a repeated sequential trial consisting of a 20-m consecutive turnaround run, 10-m run with a load, and shooting the ball into a target. Participants were […]
Related Product: Actiheart
Publication Date: September 15, 2021
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