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.

Filter by product, application, keyword, author or use free text search to locate your area of interest.

  • Application

  • Keywords

  • Author

Found 99 Results

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


Firefighters muscular recovery after a heavy work bout in the heat

Occasionally firefighters need to perform very heavy bouts of work, such as smoke diving or clearing an accident site, which induce significant muscle fatigue. The time span for muscular recovery from such heavy work is not known. The purpose of this study was to evaluate firefighters’ force-, neural-, metabolic-, and structural-related recovery after task-specific heavy […]

Related Product: Actiheart

Publication Date: October 17, 2012


Following ergonomics guidelines decreases physical and cardiovascular workload during cleaning tasks

The aim was to investigate the effect of ergonomics guidelines on muscular activity, postural and cardiovascular load during cleaning. Eighteen cleaners performed 10 min of cleaning tasks in two locations; three min in a laboratory and seven min in a lecture room. All participants performed the task with or without focusing on ergonomics guidelines (ergonomics/non-ergonomics […]

Related Product: Actiheart

Publication Date: March 12, 2012


Comparison of Effects of Acupuncture at “Shenmen”(HT7) and Sham Point on Heart Rate and Heart Rate Variability

Objective: To compare the effects of acupuncture at Shenmen(HT7) and sham point on changes of heart rate(HR) and heart rate variability(HRV),so as to investigate the specificity of HT7.Methods: Sixty healthy volunteers were randomly assigned to two groups with HT7 group and sham point group(n=30/group).Subjects in the two groups were connected with the Actiheart electrographic recorder […]

Related Product: Actiheart

Publication Date: November 1, 2011


Exploration of use of SenseCam to support autobiographical memory retrieval within a cognitive-behavioural therapeutic intervention following acquired brain injury

Delivering effective psychotherapy to address the significant emotional consequences of acquired brain injury (ABI) is challenged by the presence of acquired cognitive impairments, especially retrieval of detailed autobiographical memories of emotional trigger events. Initial studies using a wearable camera (SenseCam) suggest long-term improvements in autobiographical retrieval of recorded events. In this study a single-case experimental […]

Related Product: Actiheart

Publication Date: October 1, 2011


Exposure To Particulate Matter and Its Relative Effect On Heart Rate Variability For Differing Physiological States With Implications For Commuter Modal Choice

Background and Aims: Links between particulate matter (PM) exposure and decreased heart rate variability (HRV) have been documented in studies of older, susceptible individuals, those with existing cardiovascular conditions (Gold et al 2000; Brook et al 2010) and also in young healthy adults (Vallejo et al 2006). HRV is a marker of the risk of […]

Related Product: Actiheart

Publication Date: June 6, 2011


Fear of dying and inflammation following acute coronary syndrome

Aims Many patients are afraid of dying during acute coronary syndrome (ACS), but the origins and biological correlates of these emotional responses are poorly understood. This study evaluated the prevalence of fear of dying, associations with inflammatory responses during ACS, and later heart rate variability (HRV) and cortisol secretion. Methods and results Two hundred and […]

Related Product: Actiheart

Publication Date: June 1, 2011


Associations between the cortisol awakening response and heart rate variability

The process of morning awakening is associated with a marked increase in cortisol secretion, the cortisol awakening response (CAR), as well as with a burst in cardiovascular (CV) activation. Whilst the CAR is largely driven by awakening-induced activation of hypothalamic–pituitary–adrenal axis, it is fine-tuned by direct sympathetic input to the adrenal gland. In parallel, awakening-induced […]

Related Product: Actiheart

Publication Date: May 1, 2011


Video game playing increases food intake in adolescents: a randomized crossover study

Background: Video game playing has been linked to obesity in many observational studies. However, the influence of this sedentary activity on food intake is unknown. Objective: The objective was to examine the acute effects of sedentary video game play on various components of energy balance. Design: With the use of a randomized crossover design, 22 […]

Related Product: Actiheart

Publication Date: April 13, 2011


Comparison of two systems for long-term heart rate variability monitoring in free-living conditions-a pilot study

Objective A number of small portable systems that can measure HRV are available to address questions related to autonomic regulation in free-living subjects. However, ambulatory HRV measurements obtained through use of these systems have not previously been validated against standard clinical measurements such as Holter recordings. The objective of this study was to validate HRV […]

Related Product: Actiheart

Publication Date: April 12, 2011


The effects of exercise withdrawal on mood and inflammatory cytokine responses in humans

Mechanisms underlying the relationship between exercise and mood are not well understood. This study sought to investigate the role of pro- and anti-inflammatory cytokines and autonomic balance in determining the impact of exercise withdrawal on negative mood. Healthy men and women who regularly exercised (N = 26, mean age = 25.5 years, SD = 4.5 […]

Related Product: Actiheart

Publication Date: March 27, 2011


“The heart does not lie”: ameliorating fear of public speaking

This presentation reviews findings from an ongoing research project addressing techniques to ameliorate communication anxiety in students. Participants complete self report measures that are compared to physiological arousal as identified through interbeat interval and heart rate. Randomly selected students complete journals where they engage in cognitive restructuring exercises and are compared to students who do […]

Related Product: Actiheart

Publication Date: March 9, 2011


Effect of Acupuncture of Shenmen Acupoint on Heart Rate Variability Frequency Domain [J]

Objective:The changes of heart rate variability frequency domain(HRV-FD) before acupuncture of Shenmen acupoint,during retaining needle and after needle withdrawal were observed to analyze the influence of acupuncture of Shenmen on autonomic nerve function,and to explore its possible therapeutic mechanism.Methods:Seventy subjects lay on their back after taking a rest,and then were connected with the Actiheart electrographic […]

Related Product: Actiheart

Publication Date: October 1, 2010


Study on the Effect of Needling Shenmen (HT7) on Heart Rate Variability Time Domain Indices [J]

Objective To record the heart rate varibility(HRV) time domain indices before,during and after needling Shenmen(HT7) in order to analyze the effect of needdling HT7 on autonomic nerves.MethodsSeventy healthy volunteers received 10 min of the examination of HRV respectively before,during and after needling HT7 by Actiheart electrographic recorder.Then analyzed the time domain indices,including SDNN,RMSSD and HRV […]

Related Product: Actiheart

Publication Date: August 1, 2010


Cortisol is significantly correlated with cardiovascular responses during high levels of stress in critical care personnel

Objective Everyday stressors elicit adaptive changes in the hypothalamic-pituitary-adrenal (HPA) axis and the autonomic nervous system. Data on the relationship between these two systems under real-life conditions are sparse. We, therefore, sought to examine the association between HRV and salivary cortisol, which were recorded simultaneously in a stress-exposed, prospective, occupational cohort. Methods The study population […]

Related Product: Actiheart

Publication Date: April 1, 2010


Prevention of depression and sleep disturbances in elderly with memory-problems by activation of the biological clock with light-a randomized clinical trial

Background Depression frequently occurs in the elderly and in patients suffering from dementia. Its cause is largely unknown, but several studies point to a possible contribution of circadian rhythm disturbances. Post-mortem studies on aging, dementia and depression show impaired functioning of the suprachiasmatic nucleus (SCN) which is thought to be involved in the increased prevalence […]

Related Product: Actiheart

Publication Date: February 23, 2010


Associations between psychosocial state variables and the cortisol awakening response in a single case study

The current study investigated intra-individual associations between psychosocial state variables and the cortisol awakening response (CAR) in a detailed case study of a 27-year-old healthy male (TS) carried out over 50 measurement days, occurring at 3-day intervals. Quantitative diaries capturing psychosocial states were filled out on the evening before each study day as well as […]

Related Product: Actiheart

Publication Date: February 1, 2010


Stress in telephone helpline nurses: research protocol for a study of theoretical determinants, physiological aspects and behavioural consequences

Aim. This is a report of a research protocol to assess level, determinants and consequences of stress in NHS-24 telephone helpline nurses. Background. Nurses working in traditional hospital settings report high levels of occupational stress. Many nurses now work in call centres, environments with their own inherent stressors. Stress in nurses has been linked to […]

Related Product: Actiheart

Publication Date: September 11, 2009


Use of a single case study design to examine state variation in the cortisol awakening response: relationship with time of awakening

Recent evidence suggests that the cortisol awakening response (CAR) on any single day is determined by a combination of trait and state factors; however, the nature of such state associations remains largely unexplored. In this study we examined day-to-day changes in the CAR and their covariance with simultaneous changes in sleep-related variables, alcohol consumption, and […]

Related Product: Actiheart

Publication Date: May 1, 2009


Playing a violent television game affects heart rate variability

Objective: To investigate how playing a violent/nonviolent television game during the evening affects sympathetic and parasympathetic reactions during and after playing as well as sleep quality during the night after playing. Subjects and Methods: In total, 19 boys, 12–15 years of age, played television games on two occasions in their homes and participated once without […]

Related Product: Actiheart

Publication Date: January 1, 2009


Page 2 of 2

UK & International customers

CamNtech Ltd.
Manor Farm
Fenstanton
Cambridgeshire
PE28 9JD, UK

US customers

CamNtech Inc.
630 Boerne Stage Airfield,
Boerne,
Texas 78006,
USA

Copyright

© 2022 CamNtech Ltd and CamNtech Inc

Company information

Registered in England No. 2221302
VAT No: GB486 3019 34


Privacy Policy