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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Found 104 Results

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


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


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


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


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


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


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


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


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


Visuospatial Working Memory under Fatigue: Observations with Cerebral Hemodynamics and Heart Rate Variability

Visuospatial working memory (WM) is a central component of human executive function within safety-critical systems, where the interactions between fatigue due to timeon-task and WM capacity remain critical yet under-explored dimensions. In this work, we investigated the temporal dynamics of brain activation, functional connectivity, and heart-rate variability (HRV) during a fatiguing visuospatial two-back test. We […]

Related Product: Actiheart

Publication Date: September 1, 2021


Heart Rate Variability and Long Chain n-3 Polyunsaturated Fatty Acids in Chronic Kidney Disease Patients on Haemodialysis: A Cross-Sectional Pilot Study

Low heart rate variability (HRV) is independently associated with increased risk of sudden cardiac death (SCD) and all cardiac death in haemodialysis patients. Long chain n-3 polyunsaturated fatty acids (LC n-3 PUFA) may exert anti-arrhythmic effects. This study aimed to investigate relationships between dialysis, sleep and 24 h HRV and LC n-3 PUFA status in […]

Related Product: Actiheart

Publication Date: July 18, 2021


Effect of napping on a bean bag chair on sleep stage, muscle activity, and heart rate variability

Although ample evidence has demonstrated that daytime napping is beneficial for health and cognitive performance, bedding for napping has not yet been scientifically investigated. In this study, we assessed the effect of a bean bag chair (BC), which would automatically adjust according to body shape and size, on daytime napping and physiological parameters related to […]

Related Product: Actiheart

Publication Date: July 8, 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


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


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


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


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


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


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


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


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


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


Heart rate variability and long chain n-3 PUFA in patients with chronic kidney disease commencing haemodialysis: a cross-sectional study

The risk of sudden cardiac death (SCD) is doubled when a patient with chronic kidney disease (CKD) stage 5 starts haemodialysis. Low heart rate variability (HRV) has been reported to be independently associated with increased risk of SCD and all cardiac death in haemodialysis patients. Long chain n-3 polyunsaturated fatty acids (LC n-3 PUFA; 20:5n-3, […]

Related Product: Actiheart

Publication Date: June 10, 2020


Effects of Proximity between Companion Dogs and Their Caregivers on Heart Rate Variability Measures in Older Adults: A Pilot Study

Heart rate variability (HRV) is a noninvasive tool used to evaluate autonomic nervous system function and is affected by age, stress, postural changes, and physical activity. Dog ownership has been associated with higher 24-hr HRV and increased physical activity compared to nonowners. The current pilot study was designed to evaluate the effects of proximity to […]

Related Product: Actiheart

Publication Date: April 13, 2020


Differences in psychomotor activity and heart rate variability in patients with newly diagnosed bipolar disorder, unaffected relatives, and healthy individuals

Background Heart rate variability (HRV) and psychomotor activity have been found reduced in bipolar disorder (BD) but has never been investigated in newly diagnosed BD and unaffected relatives. The present study aimed to compare HRV and psychomotor activity between newly diagnosed patients with BD, their unaffected first-degree relatives (UR), and healthy control individuals (HC). Methods […]

Related Product: Actiheart

Publication Date: March 21, 2020


Fatty fish intervention and psychophysiological responses to mental workload in forensic inpatients: A randomized control trial

The overall aim of this randomized controlled trial was to investigate the effect of a long-term fatty fish intervention during winter time on psychophysiological responses, that is, heart rate variability (HRV), to mental workload. Forty-seven forensic inpatients were randomly assigned into a fish group (FG) or a control group (CG). HRV responses to an experimental […]

Related Product: Actiheart

Publication Date: February 1, 2020


The effect of clinical simulation assessment on stress and anxiety measures in emergency care students

Background Clinical simulation has become widespread as a training and assessment tool across a range of health professions, including emergency care. As with any form of assessment, simulations may be associated with stress and anxiety (“distress”) which may have a negative effect on student performance if demands required by the simulation outweigh the available resources. […]

Related Product: Actiheart

Publication Date: January 7, 2020


Companion dog foster caregiver program for older veterans at the VA Maryland Health Care System: a feasibility study

Veterans experience mental health conditions at a disproportionate rate compared to their civilian counterparts, and approximately 60% of older veterans who receive their care through the United States Department of Veterans Affairs (VA) do not meet physical activity (PA) recommendations. We tested the Veterans as Foster Ambassadors program at the VA Maryland Health Care System […]

Related Product: Actiheart

Publication Date: November 4, 2019


Association of social jetlag with sleep quality and autonomic cardiac control during sleep in young healthy men

Social jetlag (SJL), the difference in sleep timing between work and free days is a consequence of the discrepancy between the individual’s circadian rhythm and the social clock. SJL is considered a chronic stress factor and has been linked to various health problems. In this field study, we examined for the first time the association […]

Related Product: Actiheart

Publication Date: September 6, 2019


Effects of eight weeks traditional archery training on heart rate variability among sedentary youth

Heart rate variability (HRV) provides information of cardiac autonomic control which indicates the interaction of sympathetic and parasympathetic nervous system. The purpose of this study was to investigate the effects of eight weeks traditional archery training on heart rate variability among sedentary lifestyle youth. Thirty-four inactive male (performed <150 minutes moderate to vigorous physical activity […]

Related Product: Actiheart

Publication Date: August 21, 2019


Heart Rate Variability and Academic Performance of First-Year University Students

Background: Heart rate variability (HRV) measures have been shown to be positively associated with cognitive processing, while a positive association between cognitive processing and academic performance has been demonstrated. Objectives: To determine whether resting HRV or HRV marker response to either a cognitive or an orthostatic challenge is significantly associated with a first-year university student’s […]

Related Product: Actiheart

Publication Date: July 2, 2019


The Efficacy of Respiratory Regulation on Parasympathetic Nervous System Appraised by Heart Rate Variability

Purpose Stress and sleep deprivation are caused by the imbalance of autonomic nervous system, especially in low activity of parasympathetic nervous system (PNS), which affect daily living and impact economics severely. Since the PNS restores and conserves body and in response to stimulations. Moreover, voluntary control of respiratory rhythm, known as respiratory regulation, is considered […]

Related Product: Actiheart

Publication Date: May 14, 2019


Validity of commonly used heart rate variability markers of autonomic nervous system function

Background: Despite strong reservations regarding the validity of a number of heart rate variability (HRV) measures, these are still being used in recent studies. Aims: We aimed to compare the reactivity of ostensible sympathetic HRV markers (low and very low frequency [LF and VLF]) to that of electrodermal activity (EDA), an exclusively sympathetic marker, in […]

Related Product: Actiheart

Publication Date: May 1, 2019


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


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