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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Adaptive Training on Basic AR Interactions: Bi-Variate Metrics and Neuroergonomic Evaluation Paradigms
Augmented Reality (AR) training is a cost-effective and safe alternative to traditional instructional methods. However, training novices in basic mid-air AR interactions remains challenging. To address this, we aimed to: (a) develop a robust metric to evaluate user performance across different AR interaction techniques and develop adaptation models to predict additional training requirements; (b) evaluate […]
Related Product: Actiheart
Publication Date: September 1, 2023
Examining the Associations of Early Childhood Teacher’s Emotional Well-being with Physiologic Stress, Mindfulness and Self-Compassion
Background Recent national reports indicate that early childhood (EC) teachers experience exceptionally high levels of chronic stress which can lead to adverse health outcomes. In this presentation, we share preliminary evidence of a mindfulness-based intervention, Cultivating Healthy Intentional Mindful Educators (CHIME) to support EC teachers’ regulatory processes. We hypothesize EC teachers’ social-emotional health is related […]
Related Product: Actiheart
Publication Date: June 15, 2023
Brain responses to food viewing in women during pregnancy and post partum and their relationship with metabolic health: study protocol for the FOODY Brain Study, a prospective observational study
Introduction Food cravings are common in pregnancy and along with emotional eating and eating in the absence of hunger, they are associated with excessive weight gain and adverse effects on metabolic health including gestational diabetes mellitus (GDM). Women with GDM also show poorer mental health, which further can contribute to dysregulated eating behaviour. Food cravings […]
Related Product: Actiheart
Publication Date: May 18, 2023
Identifying a urinary peptidomics profile for hypertension in young adults: The African‐PREDICT study
Hypertension is one of the most important and complex risk factors for cardiovascular diseases (CVDs). By using urinary peptidomics analyses, we aimed to identify peptides associated with hypertension, building a framework for future research towards improved prediction and prevention of premature development of CVD. We included 78 hypertensive and 79 normotensive participants from the African-PREDICT […]
Related Product: Actiheart
Publication Date: March 21, 2023
Impact of minimally invasive surgery on surgeon health (ISSUE) study: protocol of a single-arm observational study conducted in the live surgery setting
Introduction The rapid evolution of minimally invasive surgery has had a positive impact on patient outcomes; however, it is reported to be associated with work-related musculoskeletal symptoms (WMS) in surgeons. Currently there is no objective measure to monitor the physical and psychological impact of performing a live surgical procedure on the surgeon. Methods and analysis […]
Related Product: Actiheart
Publication Date: March 7, 2023
Changes in nocturnal heart rate variability in people living with HIV during the first year of antiretroviral therapy compared to HIV-uninfected community controls
Background: Higher nocturnal heart rate and lower nocturnal heart rate variability (HRV) is associated with increased cardiovascular disease mortality. Longitudinal studies on nocturnal HRV in people living with HIV (PLWH) are lacking. Methods: We conducted a one-year prospective cohort study of adult PLWH and HIV-uninfected community controls in north-western Tanzania. At enrollment, we collected data […]
Related Product: Actiheart
Publication Date: March 1, 2023
Sedentary Lifestyle Implication on Cardio-Autonomic Function and Adaptation to Archery as a Reversible Intervention
The study’s objectives were to investigate the effects of a 12-week sedentary lifestyle on heart rate variability (HRV) and the effectiveness of archery as an intervention in a sedentary young population. 34 young people were divided into the sedentary group (SG) and the archery group at random (IG). While IG underwent a 12-week archery intervention […]
Related Product: Actiheart
Publication Date: January 1, 2023
Heart Rate Variability and Stress in the Intensive Care Unit Nursing Workplace
Intensive care unit (ICU) nurses work in a demanding environment, facing repeated encounters with trauma and ethical issues when caring for patients. Psychological stressors can include death of patients, violent acts by patients or their families, caring for suffering patients, and moral distress from performing futile care. These factors place ICU nurses at increased risk […]
Related Product: Actiheart
Publication Date: January 1, 2023
Physiological and perceptual consequences of trust in collaborative robots: An empirical investigation of human and robot factors
Measuring trust is an important element of effective human-robot collaborations (HRCs). It has largely relied on subjective responses and thus cannot be readily used for adapting robots in shared operations, particularly in shared-space manufacturing applications. Additionally, whether trust in such HRCs differ under altered operator cognitive states or with sex remains unknown. This study examined […]
Related Product: Actiheart
Publication Date: August 3, 2022
Heart rate variability during sleep after two, four and seven consecutive night shifts and recovery days: a cross-over intervention study
Objective Recovery after shift work is an important part reducing the health problems related to shift work. Heart rate variability (HRV) is an indicator of the balance between sympathetic and parasympathetic activity in the autonomic nervous system and can be used as a measure of recovery after night shifts. The aim of the study is […]
Related Product: Actiheart
Publication Date: August 2, 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
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
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
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
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
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