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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Comparison of Heart Rate Variability among Young Malay Male Adult with Different BMI and Level of Adiposity
INTRODUCTION: Subclinical changes that occur in the heart at an early age may provide valuable information to outline prevention strategies for cardiovascular diseases. Heart rate variability (HRV) reflects regulation of autonomic balance, heart, and vascular tone, which are the determinants of blood pressure. Therefore, this study aimed to determine the difference in heart rate variability […]
Related Product: Actiheart
Publication Date: April 1, 2019
Physical Fitness and Psychological Hardiness as Predictors of Parasympathetic Control in Response to Stress: a Norwegian Police Simulator Training Study
The individual biopsychological response to a specific stressor is the result of a complex interplay between many different factors including physiology, behavior, and personality. The goal of the present study was to explore the potential link between physical fitness, hardiness (Kobasa 1979), and the individual autonomic stress arousal experienced during a stressful police training situation […]
Related Product: Actiheart
Publication Date: March 25, 2019
Objectively measured sitting and standing in workers: Cross-sectional relationship with autonomic cardiac modulation
Excessive sitting and standing are proposed risk factors for cardiovascular diseases (CVDs), possibly due to autonomic imbalance. This study examines the association of objectively measured sitting and standing with nocturnal autonomic cardiac modulation. The cross-sectional study examined 490 blue-collar workers in three Danish occupational sectors. Sitting and standing during work and leisure were assessed during […]
Related Product: Actiheart
Publication Date: February 22, 2019
Effects of aircraft noise exposure on heart rate during sleep in the population living near airports
Background Noise in the vicinity of airports is a public health problem. Many laboratory studies have shown that heart rate is altered during sleep after exposure to road or railway noise. Fewer studies have looked at the effects of exposure to aircraft noise on heart rate during sleep in populations living near airports. Objective The […]
Related Product: Actiheart
Publication Date: January 18, 2019
The association between multisite musculoskeletal pain and cardiac autonomic modulation during work, leisure and sleep–a cross-sectional study
Background The prevention and rehabilitation of multisite musculoskeletal pain would benefit from studies aiming to understand its underlying mechanism. Autonomic imbalance is a suggested mechanism for multisite pain, but hardly been studied during normal daily living. Therefore, the aim of the study is to investigate the association between multisite musculoskeletal pain and cardiac autonomic modulation […]
Related Product: Actiheart
Publication Date: November 20, 2018
Capturing patients’ symptom expression and spouses’ cardiovascular responses continuously: The feasibility of examining a mechanism of disease risk in the home
Introduction: Spousal caregivers face increased cardiovascular risks; lab studies suggest that autonomic reactivity to patients’ physical suffering may play a role. To evaluate this mechanism in daily life, our pilot study characterized the feasibility of recruiting couples for a multi-method, in-home assessment. We examined the usability of the resulting data in an effort to link […]
Related Product: Actiheart
Publication Date: October 22, 2018
A case study of two adolescent–parent pairs describing the association between vagal tone and social-emotional adjustment during a Positive Cognitive Behaviour Therapy Programme
Objective: A case study describing the association between vagal tone and social-emotional adaptation in two distressed adolescent–parent (A–P) pairs during a Positive Cognitive Behaviour Therapy Programme (P-CBTP). Methods: Two A–P pairs completed a P-CBTP with pre- and post-intervention biosocial-emotional assessments; weekly training sessions over 7 weeks to develop individual strengths, new adaptive cognitions, positive discipline […]
Related Product: Actiheart
Publication Date: September 21, 2018
Improving work for the body–a participatory ergonomic intervention aiming at reducing physical exertion and musculoskeletal pain among childcare workers (the TOY-project): study protocol for a wait-list cluster-randomized controlled trial
Background The prevalence of musculoskeletal pain (MSP) is persistently high throughout the world. Work-related factors such as high physical workload (lifting, bending and twisting of the back) are considered to be among the main causes of MSP. Work in childcare includes the need to lift, carry, and support children in a range of activities, requiring […]
Related Product: Actiheart
Publication Date: July 31, 2018
Electro-acupuncture at Jianshi (PC5) and Neiguan (PC6) alters heart rate variability (HRV) in frightened volunteers
Background: Fear is one of the most widely studied emotions and is closely associated with the autonomic nervous system (ANS). Previous studies have proven that acupuncture directly impacts the ANS, influences the heart rate (HR) and the heart rate variability (HRV) and exerts other effects. The aim of this study was to explore the effect […]
Related Product: Actiheart
Publication Date: June 1, 2018
Relationship of a Special Acidified Milk Protein Drink with Cognitive Performance: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study in Healthy Young Adults
A previous in vivo study with rats suggested that a special milk protein drink manufactured using an acidification procedure to suppress the aggregation of milk proteins was absorbed quickly after feeding. We performed a randomized, double-blind, placebo-controlled, repeated-measure crossover study to investigate the short-term effects on cognitive performance in 29 healthy young adult men after […]
Related Product: Actiheart
Publication Date: May 8, 2018
Different autonomic responses to occupational and leisure time physical activities among blue-collar workers
Purpose The differential effect of occupational and leisure time physical activity on cardiovascular health is termed the physical activity health paradox. Cardiac autonomic modulation could bring insights about the underlying mechanism behind this differential effect. The aim was to compare heart rate variability (HRV) during different activities (sitting, standing and moving) at work and leisure […]
Related Product: Actiheart
Publication Date: April 1, 2018
Ingestion of coffee polyphenols suppresses deterioration of skin barrier function after barrier disruption, concomitant with the modulation of autonomic nervous system activity in healthy subjects
The aim of this study was to evaluate the effect of consumption of coffee polyphenols (CPPs) on the autonomic nervous system activity and decreased skin barrier function caused by sodium dodecyl sulfate (SDS) treatment. In this single-blind, placebo-controlled study, ten healthy male subjects consumed either a beverage containing CPPs or a placebo beverage for four […]
Related Product: Actiheart
Publication Date: March 7, 2018
Shift work is associated with reduced heart rate variability among men but not women
Background Imbalance in the autonomic nervous system due to a disrupted circadian rhythm may be a cause of shift work-related cardiovascular diseases. Objective We aimed to determine the association between shift work and cardiac autonomic activity in blue-collar workers. Methods The study included 665 blue-collar workers aged 18–68 years in different occupations from two Danish cohort […]
Related Product: Actiheart
Publication Date: February 9, 2018
Association between the Profile of Mood States and Autonomic Nervous System Activity during Sleep in Female Students
Introduction: This study focused on autonomic nervous system activity during sleep and after arousal and mood changes, and examined the association between mood and emotional changes and autonomic nervous system activity during sleep and after arousal in healthy young individuals through spectral analysis of variations in R-R intervals on electrocardiography as autonomic nervous system activity […]
Related Product: Actiheart
Publication Date: February 1, 2018
Characterization of skin function associated with obesity and specific correlation to local/systemic parameters in American women
Background Obesity is considered problematic not only as a major cause of diabetes, hypertension, and dyslipidemia, but also as a risk of intractable dermatosis; however influence of obesity on skin function has not been clarified. To clarify the mechanism of obesity-associated skin disorders, we aimed to characterize the skin function of subjects with obesity, and […]
Related Product: Actiheart
Publication Date: November 13, 2017
Allostatic load and heart rate variability as health risk indicators
Background: Uncertainty often exists about the comparability of results obtained by different health risk indicator systems. Objectives: To compare two health risk indicator systems, i.e, allostatic load and heart rate variability (HRV). Additionally, to investigate the feasibility of inclusion of HRV indicators into allostatic load assessments and which HRV indicators are best to introduce. Methods: […]
Related Product: Actiheart
Publication Date: July 13, 2017
Autonomic Nervous Activity in Multiparous Women during Early Postpartum Period: A Descriptive Study
Background: The purpose of the present study is to analyze the autonomic nervous activity in multiparas while resting, nursing, and rooming-in/rooming-out during days 1 to 3 of early postpartum period. Methods: Subjects were asked to record the actions they performed while wearing a heart rate monitor. Changes in autonomic nervous activity from 9 am to […]
Related Product: Actiheart
Publication Date: July 7, 2017
Designing, prototyping and evaluating digital mindfulness applications: a case study of mindful breathing for stress reduction
Background: During the past decade, there has been a rapid increase of interactive apps designed for health and well-being. Yet, little research has been published on developing frameworks for design and evaluation of digital mindfulness facilitating technologies. Moreover, many existing digital mindfulness applications are purely software based. There is room for further exploration and assessment […]
Related Product: Actiheart
Publication Date: June 14, 2017
Relationships between transepidermal water loss, cutaneous microcirculatory function and autonomic nervous activity
Objective Several studies have shown that a deterioration of skin properties, an impaired cutaneous microcirculatory function and an imbalance of autonomic nervous activity are observed in smokers and in patients with diabetes mellitus or Raynaud’s phenomenon. These observations suggest that skin properties are associated with cutaneous microcirculatory function and autonomic nervous activity in pathological conditions. […]
Related Product: Actiheart
Publication Date: June 1, 2017
It is not all bad for the grey city–A crossover study on physiological and psychological restoration in a forest and an urban environment
Today, urbanization presents a challenge to urban planning with regard to creating healthy living environments. The aim of this research is to gain further knowledge of the restorativeness of a best case urban and natural environment: that is a historic down town urban environment and forest environment located in an arboretum. The study has a […]
Related Product: Actiheart
Publication Date: May 18, 2017
On the health paradox of occupational and leisure-time physical activity using objective measurements: Effects on autonomic imbalance
Objective Leisure-time physical activity (LTPA) has considerable benefits for cardiovascular health and longevity, while occupational physical activity (OPA) is associated with an elevated cardiovascular risk. This “health paradox” may be explained by different effects on the autonomic nervous system from OPA and LTPA. Thus, we aimed to investigate whether objectively measured OPA and LTPA are […]
Related Product: Actiheart
Publication Date: May 4, 2017
A comparison of heart rate variability, n-3 PUFA status and lipid mediator profile in age-and BMI-matched middle-aged vegans and omnivores
Low heart rate variability (HRV) predicts sudden cardiac death. Long-chain (LC) n-3 PUFA (C20–C22) status is positively associated with HRV. This cross-sectional study investigated whether vegans aged 40–70 years (n 23), whose diets are naturally free from EPA (20 : 5n-3) and DHA (22 : 6n-3), have lower HRV compared with omnivores (n 24). Proportions […]
Related Product: Actiheart
Publication Date: March 14, 2017
Effect of an aerobic exercise intervention on cardiac autonomic regulation: A worksite RCT among cleaners.
Objective The aim of this randomized controlled trial (RCT) was to determine whether aerobic exercise during work hours affects cardiac autonomic regulation in cleaners characterized by high levels of occupational physical activity and poor cardiorespiratory fitness. Method Eligible cleaners (n = 116) were randomized to an aerobic exercise group (n = 59) or a reference […]
Related Product: Actiheart
Publication Date: February 1, 2017
State-related differences in heart rate variability in bipolar disorder.
Heart rate variability (HRV) is a validated measure of sympato-vagal balance in the autonomic nervous system. HRV appears decreased in patients with bipolar disorder (BD) compared with healthy individuals, but the extent of state-related alterations has been sparingly investigated. The present study examined differences in HRV between affective states in BD. A heart rate and […]
Related Product: Actiheart
Publication Date: January 12, 2017
Reproducibility of heart rate variability indices in children with cystic fibrosis
Fundamental to the potential utilisation of heart rate variability (HRV) indices as a prognostic tool is the reproducibility of these measures. The purpose of the present study was therefore to investigate the reproducibility of 24-hour derived HRV indices in a clinical paediatric population. Eighteen children (10 boys; 12.4 ± 2.8 years) with mild to moderate […]
Related Product: Actiheart
Publication Date: March 11, 2016
Prolonged sitting is associated with attenuated heart rate variability during sleep in blue-collar workers
Prolonged sitting is associated with increased risk for cardiovascular diseases and mortality. However, research into the physiological determinants underlying this relationship is still in its infancy. The aim of the study was to determine the extent to which occupational and leisure-time sitting are associated with nocturnal heart rate variability (HRV) in blue-collar workers. The study […]
Related Product: Actiheart
Publication Date: November 19, 2015
Metabolic adaptation to caloric restriction and subsequent refeeding: the Minnesota Starvation Experiment revisited
Background: Adaptive thermogenesis (AT) is the fat-free mass (FFM)–independent reduction of resting energy expenditure (REE) to caloric restriction (CR). AT attenuates weight loss and favors weight regain. Its variance, dynamics, and control remain obscure. Objectives: Our aims were to address the variance and kinetics of AT, its associations with body composition in the context of […]
Related Product: Actiheart
Publication Date: October 23, 2015
Understanding the Links between Positive Wellbeing and Health
People with higher levels of positive wellbeing may enjoy better health and live longer, but it is not clear why. This thesis explores the notion that links between positive wellbeing and health-relevant biological correlates could provide some explanation for the relationship between positive wellbeing and health. Two complementary approaches were used. First, associations between the […]
Related Product: Actiheart
Publication Date: June 1, 2015
Controlled exposure to particulate matter from urban street air is associated with decreased vasodilation and heart rate variability in overweight and older adults
Background Exposure to particulate matter (PM) is generally associated with elevated risk of cardiovascular morbidity and mortality. Elderly and obese subjects may be particularly susceptible, although short-term effects are poorly described. Methods Sixty healthy subjects (25 males, 35 females, age 55 to 83 years, body mass index > 25 kg/m2) were included in a cross-over study with […]
Related Product: Actiheart
Publication Date: March 19, 2015
Exploratory multivariate analysis of the effect of fatty fish consumption and medicinal use on heart rate and heart rate variability data
The overall aim of the present study was to explore the relationship between medicinal use and fatty fish consumption on heart rate variability (HRV) and heart rate (HR) in a group of forensic inpatients on a variety of medications. A total of 49 forensic inpatients, randomly assigned to a fish group (n = 27) or […]
Related Product: Actiheart
Publication Date: February 15, 2015
Heart rate and its variability as an indicator of mental health in male prisoners
Heart rate (HR) and its variability (HRV) has been proposed as a marker for depressive symptoms and other aspects of mental health. However, the real correlation between them is presently uncertain, as previous studies have generally been conducted on the basis of small samples. In a sample of 113 adult male prisoners, we analyzed correlations […]
Related Product: Actiheart
Publication Date: January 22, 2015
The role of insulin resistance in the association between body fat and autonomic function
Background and aim Excess body fat is associated with altered autonomic function. We investigated whether this association is mediated by insulin resistance. Methods and results Cross-sectional analysis of a subgroup of the Netherlands Epidemiology of Obesity study with measurements of autonomic function (heart rate variability calculated as mean interbeat interval, standard deviation of all normal […]
Related Product: Actiheart
Publication Date: January 1, 2015
Reduced anxiety in forensic inpatients after a long-term intervention with Atlantic salmon
The aim of the present study was to investigate the effects of Atlantic salmon consumption on underlying biological mechanisms associated with anxiety such as heart rate variability (HRV) and heart rate (HR) as well as a measure of self-reported anxiety. Moreover, these biological and self-reported outcome measures were investigated in relation to specific nutrients; vitamin […]
Related Product: Actiheart
Publication Date: November 26, 2014
Association between the sensory-motor nervous system and the autonomic nervous system in neurorehabilitation patients with severe acquired brain injury
Introduction: The relation between motor and cognitive function and autonomic nervous system (ANS) function during neurorehabilitation following acquired brain injury (ABI) has only been investigated sporadically. In the present study, it was hypothesized that clinical measures in severely injured patients would relate to heart rate variability (HRV), a measure of autonomic function. Methods: HRV measurements […]
Related Product: Actiheart
Publication Date: October 30, 2014
Effects of Electroacupuncture on PC6-Neiguan and PC5-Jianshi Points on Heart Rate and Heart Rate Variability in Fear Emotion
This study was aimed to investigate effects of electroacupunture on PC6-Neiguanand PC5-Jianshipointson heart rate and heart rate variability(HRV) in fear emotion. A total of 120 healthy volunteers were randomly allo-cated into the acupuncture group and control group, with 60 cases in each group. After 20 min frightening audiostimulation, volunteers in the acupuncture group received electroacupunture […]
Related Product: Actiheart
Publication Date: October 1, 2014
Heart rate variability analysis using robust period detection
Objective Heart rate variability (HRV) analysis, which is an important tool for activity assessment of the cardiac autonomic nervous system, very often includes the estimation of power spectra for series of interbeat intervals (IBI). Ectopic beats and artifacts have a destructive effect on the standard methods (Fourier transform, FFT) for frequency analysis. This study investigates […]
Related Product: Actiheart
Publication Date: September 23, 2014
Effects of work stress on work-related rumination, restful sleep, and nocturnal heart rate variability experienced on workdays and weekends
The present study reports the lagged effects of work stress on work-related rumination, restful sleep, and nocturnal heart rate variability experienced during both workdays and weekends. Fifty employees participated in a diary study. Multilevel and regression analyses revealed a significant relationship between work stress measured at the end of a workday, work-related rumination measured during […]
Related Product: Actiheart
Publication Date: March 17, 2014
Comparison of particulate matter dose and acute heart rate variability response in cyclists, pedestrians, bus and train passengers
Exposure to airborne particulate matter (PM) has been linked to cardiovascular morbidity and mortality. Heart rate variability (HRV) is a measure of the change in cardiac autonomic function, and consistent links between PM exposure and decreased HRV have been documented in studies. This study quantitatively assesses the acute relative variation of HRV with predicted PM […]
Related Product: Actiheart
Publication Date: January 15, 2014
Central fatigue and sympathovagal imbalance during night shift in Japanese female nurses
The aim of this study was to examine the hypothesis that Japanese female nurses with a reduced total power (TP) component of heart rate variability (HRV) will show an imbalance in sympathovagal activity during night-time work. We carried out this study on 10 healthy female nurses (30.9 ± 3.1 years) working a night shift from 16:00 to 09:00. […]
Related Product: Actiheart
Publication Date: January 2, 2014
KSR2 mutations are associated with obesity, insulin resistance, and impaired cellular fuel oxidation
Kinase suppressor of Ras 2 (KSR2) is an intracellular scaffolding protein involved in multiple signaling pathways. Targeted deletion of Ksr2 leads to obesity in mice, suggesting a role in energy homeostasis. We explored the role of KSR2 in humans by sequencing 2,101 individuals with severe early-onset obesity and 1,536 controls. We identified multiple rare variants […]
Related Product: Actiheart
Publication Date: October 24, 2013
Effect of low doses of long chain n-3 polyunsaturated fatty acids on sleep-time heart rate variability: A randomized, controlled trial.
Long chain n-3 polyunsaturated fatty acids (n-3 PUFA) derived from oily fish, eicosapentaenoic acid (20:5n-3, EPA) and particularly docosahexaenoic acid (22:6n-3, DHA), can influence cardiac myocyte electrophysiology by modulating ion channels in animal models and in vitro studies [ [1] ]. Prospective cohort studies have found a relatively consistent association between the intake of fish […]
Related Product: Actiheart
Publication Date: October 9, 2013
Influence of Frightening Audio Frequency based on Regulation of ANS by Emotion on Heart Rate and Heart Rate Variability
Objective To investigate the impact of frightening audio frequency on heart rate and its variability.Methods Seventy healthy volunteers were recruited and divided into two groups with 35 in each according to random number table.Volunteers in group 1 received neutral audio stimulation and those in group 2 received frightening audio stimulation.The heart rate and its variability […]
Related Product: Actiheart
Publication Date: September 1, 2013
Physical activities at work and risk of musculoskeletal pain and its consequences: protocol for a study with objective field measures among blue-collar workers
Background Among blue-collar workers, high physical work demands are generally considered to be the main cause of musculoskeletal pain and work disability. However, current available research on this topic has been criticised for using self-reported data, cross-sectional design, insufficient adjustment for potential confounders, and inadequate follow-up on the recurrent and fluctuating pattern of musculoskeletal pain. […]
Related Product: Actiheart
Publication Date: July 20, 2013
Rare variants in single-minded 1 (SIM1) are associated with severe obesity
Single-minded 1 (SIM1) is a basic helix-loop-helix transcription factor involved in the development and function of the paraventricular nucleus of the hypothalamus. Obesity has been reported in Sim1 haploinsufficient mice and in a patient with a balanced translocation disrupting SIM1. We sequenced the coding region of SIM1 in 2,100 patients with severe, early onset obesity […]
Related Product: Actiheart
Publication Date: June 17, 2013
High‐volume sports club participation and autonomic nervous system activity in children
Background Sixty minutes of daily moderate‐to‐vigorous physical activity (PA) are recommended for children. This study investigated the additional impact of high‐volume sports club participation on the autonomic nervous system in active children, while controlling for acute effects of short‐term PA. Materials and methods Forty‐nine children (29 females) aged 10–13 years were investigated. Sports club participation […]
Related Product: Actiheart
Publication Date: May 6, 2013
The effect of violent and nonviolent video games on heart rate variability, sleep, and emotions in adolescents with different violent gaming habits
Objective: To study cardiac, sleep-related, and emotional reactions to playing violent (VG) versus nonviolent video games (NVG) in adolescents with different gaming habits. Methods: Thirty boys (aged 13-16 years, standard deviation = 0.9), half of them low-exposed (≤1 h/d) and half high-exposed (≥3 h/d) to violent games, played a VG/NVG for 2 hours during two […]
Related Product: Actiheart
Publication Date: May 1, 2013
Heart rate variability and fatigue in patients with Chronic Fatigue Syndrome after a Comprehensive Cognitive Behavior group Therapy program
In psychotherapy research, there is a general lack of studies that include objective measurements that provide information about the basic underlying mechanisms involved in behavioral and psychiatric conditions. In this pilot study, we investigated cardiovascular activity and self-reported fatigue in patients with Chronic Fatigue Syndrome (CFS) compared to normal healthy controls who served as a […]
Related Product: Actiheart
Publication Date: April 15, 2013
Association of auricular pressing and heart rate variability in pre-exam anxiety students
A total of 30 students scoring between 12 and 20 on the Test Anxiety Scale who had been exhibiting an anxious state > 24 hours, and 30 normal control students were recruited. Indices of heart rate variability were recorded using an Actiheart electrocardiogram recorder at 10 minutes before auricular pressing, in the first half of […]
Related Product: Actiheart
Publication Date: March 25, 2013
Ethnicity and long-term heart rate variability in children
Background Low heart rate variability (HRV) is associated with increased cardiovascular disease risk. South Asians are at increased risk of cardiovascular disease. Methods This cross-sectional, observational study compared long-term HRV between South Asian and White European (EU) children. 155 children (92 White EU, 63 South Asian) aged 8±1 years wore a combined heart rate and activity […]
Related Product: Actiheart
Publication Date: March 11, 2013
A naturalistic study of the effect of acupuncture on heart-rate variability
Objectives To study the effect of acupuncture on heart rate variability (HRV) by using linear and non-linear methods of analysis. Methods 40 patients were recruited consecutively, including patients with insomnia, stomachache, diarrhea, dizziness, cervical syndrome, lower back pain, gonarthritis, peripheral facial paralysis, post-traumatic organic brain syndrome and urinary retention. Different acupoint prescriptions were used, according […]
Related Product: Actiheart
Publication Date: December 1, 2012
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