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 1410 Results

The Relationship Between Sleep and Training in Elite Youth Team Athletes in Austria

This study investigates the sleep-wake behavior of elite youth team athletes in Austria concerning their training. For this purpose, 104 athletes (M = 14.52, SD = 0.40), who were each part of a U15/U16 soccer (n = 69) or ice hockey team (n = 35), were examined over 14 – 42 days using actigraphy and sleep protocol. […]

Related Product: MotionWatch

Publication Date: December 12, 2022


Sleep–wake cycle and daytime sleepiness in patients with epilepsy after initiating perampanel as adjunctive therapy

Background Antiseizure medications (ASMs) may affect nocturnal sleep and daytime vigilance. Perampanel (PER), a third-generation ASM, showed to improve nocturnal sleep in patients with epilepsy (PWE). Although ASMs can have beneficial effects on nocturnal sleep and daytime sleepiness, no study investigated the effect of PER on both sleep–wake cycle and daytime sleepiness. Therefore, this study […]

Related Product: MotionWatch

Publication Date: December 8, 2022


Mind wandering and sleep in daily life: A combined actigraphy and experience sampling study

Individuals who sleep poorly report spending more time mind wandering during the day. However, past research has relied on self-report measures of sleep or measured mind wandering during laboratory tasks, which prevents generalization to everyday contexts. We used ambulatory assessments to examine the relations between several features of sleep (duration, fragmentation, and disturbances) and mind […]

Related Product: PRO-Diary

Publication Date: December 2, 2022


Longitudinal cardio-respiratory fitness prediction through wearables in free-living environments

Cardiorespiratory fitness is an established predictor of metabolic disease and mortality. Fitness is directly measured as maximal oxygen consumption (VO2max), or indirectly assessed using heart rate responses to standard exercise tests. However, such testing is costly and burdensome because it requires specialized equipment such as treadmills and oxygen masks, limiting its utility. Modern wearables capture […]

Related Product: Actiheart

Publication Date: December 2, 2022


Effects of resilience training on mental, emotional, and physical stress outcomes in military officer cadets

Resilience is an important factor in counteracting the harmful effects of stress and is associated with healthy physiological and psychological responses to stress. Previous research has demonstrated the effectiveness of resilience fostering training programs in psychobiological stress response and recovery. Few studies, however, have examined training effects in real-life high-stress situations. In this study, we […]

Related Product: Actiheart

Publication Date: December 1, 2022


Efficacy and tolerability of a specific blend of amino acids in patients with anorexia nervosa treated in a hospital setting. Study protocol for a randomized controlled trial

Background Specific blends of essential amino acids (EAA) containing a high percentage of branched-chain amino acids preserves mitochondrial metabolism and higher physical resistance in elderly mice, increasing their survival and improving physical performance and cognitive functions in malnourished elderly patients. However, no study has been yet done on patients with anorexia nervosa (AN) who regain […]

Related Product: Actiheart

Publication Date: November 29, 2022


Inverse forgetting in unconscious episodic memory

Forming memories of experienced episodes calls upon the episodic memory system. Episodic encoding may proceed with and without awareness of episodes. While up to 60% of consciously encoded episodes are forgotten after 10 h, the fate of unconsciously encoded episodes is unknown. Here we track over 10 h, which are filled with sleep or daytime […]

Related Product: MotionWatch

Publication Date: November 29, 2022


Protocol for single case experimental design for yoga and sleep quality and inflammation: A two-hit model of sleep intervention

Background Poor sleep quality is a neglected clinical condition in the elderly that could predispose them to morbidities and even mortality. Several lines of clinical evidence support the potential of Meditative Movement Interventions (MMIs) in the alleviation of sleep-related disturbances in the elderly population. However, further studies are needed to provide more definitive evidence regarding […]

Related Product: MotionWatch

Publication Date: November 28, 2022


Sound reasons for unsound sleep: Comparative support for the sentinel hypothesis in industrial and nonindustrial groups

Background and objectives Sleep is a vulnerable state in which individuals are more susceptible to threat, which may have led to evolved mechanisms for increasing safety. The sentinel hypothesis proposes that brief awakenings during sleep may be a strategy for detecting and responding to environmental threats. Observations of sleep segmentation and group sentinelization in hunter-gatherer […]

Related Product: MotionWatch

Publication Date: November 22, 2022


The association between number and ages of children and the physical activity of mothers: Cross-sectional analyses from the Southampton Women’s Survey

Background Physical activity (PA) has many health benefits, but motherhood is often associated with reduced PA. Considering that ages and number of children may be associated with maternal PA, and that PA patterns may change as children transition to formal schooling, we aimed to investigate the associations between ages and number of children and device-measured […]

Related Product: Actiheart

Publication Date: November 16, 2022


Technological infrastructure, sleep, and rest-activity patterns in a Kaqchikel Maya community

Sleep duration, quality, and rest-activity pattern—a measure for inferring circadian rhythm—are influenced by multiple factors including access to electricity. Recent findings suggest that the safety and comfort afforded by technology may improve sleep but negatively impact rest-activity stability. According to the circadian entrainment hypothesis, increased access to electric lighting should lead to weaker and less […]

Related Product: MotionWatch

Publication Date: November 16, 2022


Cross-country comparison of parental reports and objective measures of sleep patterns of typically developing children and autistic children between the UK and South Korea

Sleep duration and disturbances in typically developing (TD) children have been found to vary across countries. Given the impact of culture on sleep patterns in TD children, it is also necessary to examine the impact of culture on sleep patterns in children with atypical development. However, previous studies have often relied only on parent reports […]

Related Product: MotionWatch

Publication Date: November 14, 2022


Compression of the optic chiasm is associated with permanent shorter sleep duration in patients with pituitary insufficiency

Objective Pituitary tumours that compress the optic chiasm are associated with long-term alterations in sleep–wake rhythm. This may result from damage to intrinsically photosensitive retinal ganglion cells (ipRGCs) projecting from the retina to the hypothalamic suprachiasmatic nucleus via the optic chiasm to ensure photoentrainment (i.e. synchronisation to the 24-h solar cycle through light). To test […]

Related Product: MotionWatch

Publication Date: November 4, 2022


Physical activity volume and intensity distribution in relation to bone, lean and fat mass in children

Considering physical activity (PA) volume and intensity may provide novel insights into the relationships of PA with bone, lean, and fat mass. This study aimed to assess the associations of PA volume, PA intensity distribution, including moderate-to-vigorous PA (MVPA) with total-body-less-head bone mineral content (BMC), lean, and fat mass in children. A population sample of […]

Related Product: Actiheart

Publication Date: November 3, 2022


Timing of physical activity in relation to liver fat content and insulin resistance

Aims/hypothesis We hypothesised that the insulin-sensitising effect of physical activity depends on the timing of the activity. Here, we examined cross-sectional associations of breaks in sedentary time and timing of physical activity with liver fat content and insulin resistance in a Dutch cohort. Methods In 775 participants of the Netherlands Epidemiology of Obesity (NEO) study, […]

Related Product: Actiheart

Publication Date: November 1, 2022


Effects of pre-meal whey protein consumption on acute food intake and energy balance over a 48-hour period

The effects of pre-meal whey protein consumption on acute food intake and subsequent energy balance measured over 48-h was investigated in males of healthy-weight (HW) or living with overweight and obesity (OV/OB). On two separate trial days, following a controlled breakfast (09:00) and lunch (13:00), 12 HW and 12 OV/OB males consumed either whey protein […]

Related Product: Actiheart

Publication Date: October 27, 2022


Identifying Early Predictors of Learning in VR-based Drone Training

The use of small unmanned aerial systems, or drones, has grown rapidly in recent years, but the FAA has no formal requirement for hands-on training. Physical drone training has major limitations, and virtual reality (VR) offers a promising alternative. This study sought to identify early performance markers of learning in VR-based drone training using a […]

Related Product: Actiheart

Publication Date: October 27, 2022


Mask-wearing: effects on cognitive task performance and cardiac workload indices

Consistent with CDC recommendations and government mandates during COVID, masks are commonly required/suggested in public gathering places like workplaces and schools. Considering the implications for human factors research, the extent to which mask-wearing impacts cognitive abilities and/or workload assessment from cardiac indicators are unknown. This study investigated these effects by engaging subjects in cognitively-loading tasks […]

Related Product: Actiheart

Publication Date: October 27, 2022


Sleep and sleep hygiene of adolescents with and without ADHD during COVID-19

Restrictions related to the COVID-19 pandemic may have significantly impacted adolescents’ sleep, possibly even more so in adolescents with attention-deficit/hyperactivity disorder (ADHD). The current study examines the sleep of adolescents without ADHD (TD) and a homogeneous group of adolescents with ADHD and comorbid sleep problems using a multi-method objective and subjective assessment of sleep outcomes, […]

Related Product: MotionWatch

Publication Date: October 11, 2022


Effect of a High Estrogen Level in Early Pregnancy on the Development and Behavior of Marmoset Offspring

The use of assisted reproductive technology (ART) has risen steadily worldwide over the past 3 decades and helps many infertile families. However, ART treatments lead to an abnormal internal environment in the uterus, which may increase the risks of health problems for the offspring. Higher maternal estradiol (E2) is a notable feature in women who […]

Related Product: Actiwatch Mini

Publication Date: October 4, 2022


Experimental Sleep Deprivation Results in Diminished Perceptual Stability Independently of Psychosis Proneness

Psychotic disorders as well as psychosis proneness in the general population have been associated with perceptual instability, suggesting weakened predictive processing. Sleep disturbances play a prominent role in psychosis and schizophrenia, but it is unclear whether perceptual stability diminishes with sleep deprivation, and whether the effects of sleep deprivation differ as a function of psychosis […]

Related Product: MotionWatch

Publication Date: October 3, 2022


Genetic Engineering of Nonhuman Primate Models for Studying Neurodevelopmental Disorders

Neurodevelopmental disorders (NDDs), such as autism spectrum disorder (ASD), represent a group of highly prevalent, early onset conditions featured by neural and behavioral impairments with a strong genetic basis. Effective treatments for patients with ASD have yet to be developed due to the limited understanding of their pathophysiology and the lack of animal models that […]

Related Product: MotionWatch

Publication Date: September 30, 2022


Assessment of cardiovascular load among hotel room cleaners

Hotel room cleaners are a vulnerable population at risk for cardiovascular disease. To evaluate their workload heart rate (HR), % heart rate reserve (%HRR), blood pressure (BP), metabolic equivalent (MET), and energy expenditure (EE) were measured over two workdays and two off-workdays. The mean age was 45.5 (SD 8.2) years with a mean 10.4 (SD […]

Related Product: Actiheart

Publication Date: September 23, 2022


The association between sleep duration and detailed measures of obesity: A cross sectional analysis in the ADDITION‐PRO study

Background Sleep duration is associated with BMI and waist circumference. However, less is known about whether sleep duration affects different measurements of obesity differently. Objective To investigate the association between sleep duration and different measures of obesity. Methods In this cross-sectional analysis 1309, Danish, older adults (55% men) completed at least three days of wearing […]

Related Product: Actiheart

Publication Date: September 16, 2022


Links between household and family social dynamics with sleep profiles among BaYaka foragers of the Congo Basin

Given the contributions of sleep to a range of health outcomes, there is substantial interest in ecological and environmental factors, including psychosocial contexts, that shape variation in sleep between individuals and populations. However, the links between social dynamics and sleep are not well-characterized beyond Euro-American settings, representing a gap in knowledge regarding the way that […]

Related Product: MotionWatch

Publication Date: September 9, 2022


Issues related to the assessment of energy balance during short-term over-, under-and refeeding in normal weight men

Background In humans, it is unclear how different estimates of energy balance (EB) compare with each other and whether the resulting changes in body weight (bw) and body composition (BC) are predictable and reproducible. Methods This is a secondary data analysis of effects of sequential 7d over- (OF), 21d under- (UF) and 14d refeeding (RF) […]

Related Product: Actiheart

Publication Date: September 8, 2022


Clock Genes Profiles as Diagnostic Tool in (Childhood) ADHD—A Pilot Study

Attention deficit hyperactivity disorder (ADHD) is a very common disorder in children and adults. A connection with sleep disorders, and above all, disorders of the circadian rhythm are the subject of research and debate. The circadian system can be represented on different levels. There have been a variety of studies examining 24-h rhythms at the […]

Related Product: MotionWatch

Publication Date: September 5, 2022


Human adaptation to immobilization: Novel insights of impacts on glucose disposal and fuel utilization

Background Bed rest (BR) reduces whole-body insulin-stimulated glucose disposal (GD) and alters muscle fuel metabolism, but little is known about metabolic adaptation from acute to chronic BR nor the mechanisms involved, particularly when volunteers are maintained in energy balance. Methods Healthy males (n = 10, 24.0 ± 1.3 years), maintained in energy balance, underwent 3-day […]

Related Product: Actiheart

Publication Date: September 4, 2022


Changes in Circadian Rhythmicity during COVID-19 Pandemic Lockdowns

Background: For many people, the COVID-19 pandemic was an intrusion into their daily activities and their work and personal lives. Due to this pandemic, people were forced to spend their time mainly in their homes, which significantly reduced their activities. These restrictions have had a major impact on people, both in terms of their physical […]

Related Product: MotionWatch

Publication Date: September 2, 2022


Verification of the Effect of a Novel Lighting Source on Circadian Rhythmicity and Mood of Healthy Volunteers

Background: In today’s modern society, people spend most of their time in buildings where they are usually exposed to a mere fraction of daylight. This, combined with artificial lighting in the evening, leads to a decrease in the contrast of the photic signal between day and night, which is essential for proper circadian entrainment. Insufficient […]

Related Product: MotionWatch

Publication Date: September 2, 2022


Does the Reduction of Short-Wavelength Light during the Day Impact Human Sleep

Background: Light is the main synchronizing factor of the circadian system and provides the adaptation of organisms to rhythmic environmental conditions. Exposure to natural daylight ensures the proper functioning of the body, elevated vigilance during the day and better sleep at night. People spend most of the daytime in buildings under artificial lighting with reduced […]

Related Product: MotionWatch

Publication Date: September 2, 2022


Intake of l-serine before bedtime prevents the delay of the circadian phase in real life

Background It has been shown in laboratory experiments using human subjects that ingestion of the non-essential amino acid L-serine before bedtime enhances the advance of circadian phase induced by light exposure the next morning. In the present study, we tested the effect of ingestion of L-serine before bedtime on circadian phase in real life and […]

Related Product: MotionWatch

Publication Date: August 26, 2022


A randomized placebo-controlled trial of nicotinamide riboside and pterostilbene supplementation in experimental muscle injury in elderly individuals

BACKGROUND. During aging, there is a functional decline in the pool of muscle stem cells (MuSCs) that influences the functional and regenerative capacity of skeletal muscle. Preclinical evidence has suggested that nicotinamide riboside (NR) and pterostilbene (PT) can improve muscle regeneration, e.g., by increasing MuSC function. The objective of this study was to investigate if […]

Related Product: Actiheart

Publication Date: August 23, 2022


Activity Behaviors in British 6-Year-Olds: Cross-Sectional Associations and Longitudinal Change During the School Transition

Background: To explore activity behaviors at school entry, we describe temporal/demographic associations with accelerometer- measured physical activity in a population-based sample of British 6-year-olds, and examine change from ages 4 to 6. Methods: A total of 712 six-year-olds (308 at both ages) wore Actiheart accelerometers for ≥ 3 (mean 6.0) days. We derived minutes per […]

Related Product: Actiheart

Publication Date: August 11, 2022


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


Reshaping the Path of Mild Cognitive Impairment by Refining Exercise Prescription: A Study Protocol of a Randomized Controlled Trial to Understand the “What”,“For Whom”, and “How” of Exercise to Promote Cognitive Function

Background: Targeted exercise training is a promising strategy for promoting cognitive function and preventing dementia in older age. Despite the utility of exercise as an intervention, variation still exists in exercise induced cognitive gains and questions remain regarding the type of training (i.e., what), as well as moderators (i.e., for whom) and mechanisms (i.e., how) […]

Related Product: MotionWatch

Publication Date: August 2, 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


Daytime rest: Association with 24‐h rest‐activity cycles, circadian timing and cognition in older adults

Growing epidemiological evidence points toward an association between fragmented 24-h rest–activity cycles and cognition in the aged. Alterations in the circadian timing system might at least partially account for these observations. Here, we tested whether daytime rest (DTR) is associated with changes in concomitant 24-h rest probability profiles, circadian timing and neurobehavioural outcomes in healthy […]

Related Product: MotionWatch

Publication Date: July 29, 2022


Association between circulating 25-hydroxyvitamin D and cardiometabolic risk factors in adults in rural and urban settings

Background An inverse association between vitamin D status and cardiometabolic risk has been reported but this relationship may have been affected by residual confounding from adiposity and physical activity due to imprecise measures of these variables. We aimed to investigate the relationship between serum 25-hydroxyvitamin D (25(OH)D) and cardiometabolic risk factors, with adjustment for objectively-measured […]

Related Product: Actiheart

Publication Date: July 29, 2022


Associations between Saliva Alpha-Amylase, Heart Rate Variability, Saliva Cortisol and Cognitive Performance in Individuals at Ultra High-Risk for Psychosis

Background: Cognitive impairments are present in individuals at ultra-high risk (UHR) of psychosis and UHR individuals exhibit a hyperactive and dysfunctional HPA-axis. Increasing stress levels could potentially lead to cognitive impairments and no previous studies have examined the association between physiological stress biomarkers and cognition in UHR individuals. This study aims to examine the association […]

Related Product: Actiheart

Publication Date: July 26, 2022


The relationship between cardiac damage biomarkers and heart rate variability following 60 min of running

Purpose Endurance exercise may cause transient alterations in cardiac tissue. The number of studies evaluating the relationship between changes in heart rate variability (HRV) and cardiac biomarkers following an endurance event is limited. We hypothesized that there would be a time-dependent correlation between biomarkers of cardiac damage and the reduction in parasympathetic indices of HRV […]

Related Product: Actiheart

Publication Date: July 25, 2022


Feasibility, usability and clinical value of intensive longitudinal diary assessments in older persons with cognitive impairment and depressive symptoms.

Objectives To evaluate the feasibility, usability and clinical value of daily diary assessments combined with actigraphy in older persons with cognitive impairment. Methods For 63 days, patients ≥60 years with cognitive impairments filled out a daily diary (including standardized questionnaires and cognitive test battery), and wore an actiwatch (sleep). After the study, participants and clinicians received personal […]

Related Product: MotionWatch

Publication Date: July 23, 2022


Acute appetite and eating behaviour responses to apparatus-free, high-intensity intermittent exercise in inactive women with excess weight

High-intensity intermittent exercise (HIIE) has been shown to transiently suppress appetite, but such exercise has traditionally required the use of specialist apparatus (e.g., cycle ergometer). This study aimed to determine appetite and eating behaviour responses to acute apparatus-free HIIE in inactive women with excess weight. A preliminary study (n = 18 inactive women, 9 healthy […]

Related Product: Actiheart

Publication Date: July 18, 2022


Prenatal Cortisol Levels Estimation Using Heart Rate and Heart Rate Variability: A Weak Supervised Learning Based Approach

Cortisol is a steroid hormone that regulates a wide range of vital signs throughout the body. However, current cortisol monitoring methods are inconvenient for everyday settings. Heart Rate (HR) and Heart Rate Variability (HRV) are easily collected biological parameters whose fluctuations highly correlate with cortisol, however, there does not exist a work attempting to estimate […]

Related Product: Actiheart

Publication Date: July 15, 2022


The Role of Sleep and Eating Patterns in Adiposity Gain among Preschool-Aged Children

Background Short sleep duration is related to risk for obesity in preschool children. However, the underlying mechanism(s) are not clear. Objective We evaluated the relationship between sleep characteristics with body composition, energetics and weight-regulating behaviors in preschool-aged children; and the longitudinal associations between children’s sleep and eating patterns with body composition at 1-year follow-up. Methods […]

Related Product: Actiheart

Publication Date: July 14, 2022


The housing system influences daily total locomotor activity (TLA) in dairy cows

The daily pattern of total locomotor activity (TLA) of cattle kept in different housing conditions was investigated in order to evaluate whether TLA could be used as a useful index of animal welfare. Twenty Modicana cattle were divided into two equal groups: Group A, housed in a grazing area of 5 hectare, and Group B, […]

Related Product: Actiwatch Mini

Publication Date: July 6, 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


Evaluation of locomotor activity in female Chelonoidis chilensis (Testudinidae, Gray 1870) in response to artificial photoperiod and temperature treatments

Turtles as many other reptiles are capable of orientating their bodies toward the sun. This conduct requires the presence of an internal biological chronometer in the organism that regulates this behavior. Thus, a description of the internal clock in these reptiles is of interest. The assessment of locomotor activity can be considered a reliable indicator […]

Related Product: Actiwatch Mini

Publication Date: June 29, 2022


Influence of Moon Luminosity, Seasonality, Sex and Weather Conditions on the Activity Levels of the Nocturnal Javan Slow Loris

The activity patterns of mammals depend on environmental changes (e.g., moon luminosity, food availability, weather) and endogenous rhythms. Behavioral observations are traditionally used to estimate the activity patterns of animals, but low visibility and the cryptic nature of some species entail that, in certain conditions, the animal is visible only for around 60% of the […]

Related Product: Actiwatch Mini

Publication Date: June 27, 2022


Impact of sleep on attention in primary school-aged autistic children: Exploratory cross-cultural comparison between Singapore and UK children

Background There is a growing body of research studying the impact sleep has on attention among typically developing (TD) children, but research is lacking among autistic children. Aims The present study aimed to explore, for the first time, differences in (1) attention, (2) sleep parameters among primary school-aged Singaporean autistic children (N = 26) and […]

Related Product: MotionWatch

Publication Date: June 24, 2022


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CamNtech Ltd.
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Cambridgeshire
PE28 9JD, UK

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