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 220 Results

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

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

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

Inconsistency between objective and subjective comparisons of sleep quality is found between sea level and moderate terrestrial altitude (2,320 m) in high-performance swimmers

It is popular for high-performance athletes to attend training camps at natural moderate altitude (1800–2500m), which may have direct and indirect effects on the quantity and quality of sleep athletes obtain. This can potentially influence the ability to maximise training responses and optimise recovery from exercise. This study aimed to compare objective and subjective markers […]

Related Product: MotionWatch

Publication Date: June 20, 2022

Factors Associated with Sleep Quality in Hospitalized Persons with Dementia

Background: Factors associated with sleep quality have not been well examined in hospitalized older persons with dementia, who are at high risk for impaired sleep. The aim was to identify factors associated with sleep quality among hospitalized persons with dementia. Methods: This secondary analysis used baseline data from a cluster randomized trial. Factors examined included […]

Related Product: MotionWatch

Publication Date: June 1, 2022

Evaluating Patterns and Factors Related to Sleep Disturbances in Prostate Cancer Patients

Prostate cancer patients may experience disturbed sleep as a result of their diagnosis or treatment. This study sought to evaluate disturbed sleep and excessive daytime sleepiness in newly diagnosed patients and those receiving androgen deprivation therapy (ADT). This study was conducted with 74 patients. Subjective data using the Pittsburgh Sleep Quality Index (PSQI) and Epworth […]

Related Product: MotionWatch

Publication Date: May 30, 2022

Associations among pre-sleep arousal, facets of emotion dysregulation, and sleep quality and efficiency during pregnancy

Introduction Pre-sleep arousal contributes to over 50% of pregnant people experiencing poor sleep quality and clinical insomnia. Given that poor sleep during pregnancy is associated with depression and suicide ideation, there is a critical need to identify intervention targets, such as difficulties with emotion regulation. However, emotion dysregulation is multifaceted and warrants further investigation in […]

Related Product: MotionWatch

Publication Date: May 25, 2022

Work schedule and seasonal influences on sleep and fatigue in helicopter and fixed-wing aircraft operations in extreme environments

Sleep and fatigue were investigated in aviation search and rescue, firefighting, emergency medical services and offshore transfer operations in 210 participants, for 21 days each, across 17 datasets in seven countries. Sleep data were collected using wrist-worn actigraphs and sleep diaries. Sustained attention was assessed using a 5-min Psychomotor Vigilance Task (PVT). Duty information was […]

Related Product: MotionWatch

Publication Date: May 18, 2022

Device-measured sleep onset and duration in the development of depressive symptoms in adolescence

Background Sleep deprivation in adolescence is increasing in prevalence and may be linked to subsequent depression. Findings regarding associations between sleep duration, sleep onset time, and the development of depressive symptoms over time in adolescents are mixed, and rely on subjective measures of sleep. Methods Sleep onset and duration were assessed using a combined heart […]

Related Product: Actiheart

Publication Date: May 17, 2022

The effect of sleep continuity disruption on multimodal emotion processing and regulation: a laboratory‐based, randomised, controlled experiment in good sleepers

Previous research shows that experimental sleep deprivation alters emotion processing, suggesting a potential mechanism linking sleep disruption to mental ill-health. Extending previous work, we experimentally disrupted sleep continuity in good sleepers and assessed next-day emotion processing and regulation using tasks with established sensitivity to depression. In a laboratory-based study, 51 good sleepers (37 female; mean […]

Related Product: MotionWatch

Publication Date: May 16, 2022

Night‐to‐night variation in sleep associates with day‐to‐day variation in vigilance, cognition, memory, and behavioral problems in Alzheimer’s disease

Introduction Sleep disturbances are commonly reported in people living with Alzheimer’s disease (AD), but it is currently unknown whether night-to-night variation in sleep predicts day-to-day variation in vigilance, cognition, mood, and behavior (daytime measures). Methods Subjective and objective sleep and daytime measures were collected daily for 2 weeks in 15 participants with mild AD, eight […]

Related Product: MotionWatch

Publication Date: May 16, 2022

Pediatric Appropriate Prolonged-Release Melatonin Minitablet for Insomnia in Children and Adolescents with Autism Spectrum Disorder

Despite high rates of comorbid insomnia among children and adolescents with Autism Spectrum Disorder (ASD), and its negative impact on child development, health and quality of life, there is limited awareness among clinicians of screening for, and treatment of, insomnia in this population. Prolonged-Release Melatonin (PedPRM, available commercially as Slenyto®) is the first authorized drug […]

Related Product: MotionWatch

Publication Date: May 2, 2022

Assessment of impact of stress on objectively and subjectively measured sleep quality in the working population

I N T R O D U C T I ON: Stress is ubiquitous and has a multidirectional impact on our health. One of the most visible problems caused by stress is sleep disturbance. The aim of the study was to evaluate the impact of subjectively assessed stress on objectively and subjectively measured sleep quality […]

Related Product: MotionWatch

Publication Date: May 1, 2022

Sleep behavior and chronotype before and throughout pregnancy

Study objective To compare sleep behavior before and during pregnancy. Methods In this prospective cohort study, healthy women were followed from pre-pregnancy until delivery. At pre-pregnancy and each trimester, participants completed validated questionnaires of chronotype and sleep quality and timing, including the Munich ChronoType Questionnaire, Epworth Sleepiness Scale, and Pittsburgh Sleep Quality Index. The primary […]

Related Product: MotionWatch

Publication Date: April 27, 2022

Sleep Disturbance and Quality of Life in Rheumatoid Arthritis: Prospective mHealth Study

Background: Sleep disturbances and poor health-related quality of life (HRQoL) are common in people with rheumatoid arthritis (RA). Sleep disturbances, such as less total sleep time, more waking periods after sleep onset, and higher levels of nonrestorative sleep, may be a driver of HRQoL. However, understanding whether these sleep disturbances reduce HRQoL has, to date, […]

Related Product: MotionWatch

Publication Date: April 22, 2022

On the Road to Camarón: The Sleep of an Ultra-Endurance Athlete Cycling 10,000 km in 24 Days

The impact of sleep on performance is fundamental for ultra-endurance athletes, but studies on this issue are rare. The current investigation examined the sleep and performance of a cyclist engaged in a simulated 10,000 km tour. The sleep behavior of the athlete (age, 57; height, 1.85 m; mass, 81 kg) before, during (i.e., 23 nights), […]

Related Product: MotionWatch

Publication Date: April 9, 2022

Neural spatio-temporal patterns of information processing related to cognitive conflict and correct or false recognitions

Using a visual short-term memory task and employing a new methodological approach, we analyzed neural responses from the perspective of the conflict level and correctness/erroneous over a longer time window. Sixty-five participants performed the short-term memory task in the fMRI scanner. We explore neural spatio-temporal patterns of information processing in the context of correct or […]

Related Product: MotionWatch

Publication Date: March 28, 2022

Effects of experimental sleep restriction on energy intake, energy expenditure, and visceral obesity

Background Although the consequences of sleep deficiency for obesity risk are increasingly apparent, experimental evidence is limited and there are no studies on body fat distribution. Objectives The purpose of this study was to investigate the effects of experimentally-induced sleep curtailment in the setting of free access to food on energy intake, energy expenditure, and […]

Related Product: MotionWatch

Publication Date: March 28, 2022

Timely sleep coupling: spindle-slow wave synchrony is linked to early amyloid-β burden and predicts memory decline

Sleep alteration is a hallmark of ageing and emerges as a risk factor for Alzheimer’s disease (AD). While the fine-tuned coalescence of sleep microstructure elements may influence age-related cognitive trajectories, its association with AD processes is not fully established. Here, we investigated whether the coupling of spindles and slow waves is associated with early amyloid-beta […]

Related Product: MotionWatch

Publication Date: March 19, 2022

Exploring the relationship of sleep, cognition, and cortisol in sickle cell disease

Background Neurocognitive impairment is common in people with Sickle Cell Disease (SCD) and evidence is accumulating that sleep disturbances play a role. The interaction between cortisol and sleep in the general population is associated with cognition as well as general wellbeing but there are few data in SCD. We aimed to understand the relationship between […]

Related Product: MotionWatch

Publication Date: March 12, 2022

Time-of-day matters-pronounced regional morning-to-evening effects in structural brain metrics

In recent decades magnetic resonance imaging (MRI) has established itself as the golden standard for studying human brain structure in health and disease. As a result, it has become increasingly more important to identify factors that may influence study outcomes and contribute to misleading conclusions. With the regional time-of-day (TOD) differences in structural brain metrics […]

Related Product: MotionWatch

Publication Date: March 7, 2022

The Effect of Rugby Union Match Play on Sleep Patterns and Subsequent Impact on Postmatch Fatigue Responses

Purpose: Sleep is recognized as an important recovery strategy, yet little is known regarding its impact on postmatch fatigue. The aims of this study were to (1) describe sleep and postmatch fatigue, (2) understand how sleep is affected by contextual and match factors, and (3) assess how changes in sleep can affect postmatch fatigue. Methods: […]

Related Product: MotionWatch

Publication Date: March 1, 2022

Detailed Clinical and Functional Studies of New MTOR Variants in Smith-Kingsmore Syndrome Reveal Deficits of Circadian and Sleep Homeostasis

Heterozygous de novo or inherited gain-of-function mutations in the MTOR gene cause Smith-Kingsmore Syndrome (SKS). SKS is a rare autosomal dominant condition, and individuals with SKS display macrocephaly/megalencephaly, developmental delay, intellectual disability, and seizures. A few dozen individuals are reported in the literature. Here, we report a cohort of 28 individuals with SKS that represent […]

Related Product: MotionWatch

Publication Date: February 21, 2022

Slow oscillation–spindle coupling strength predicts real-life gross-motor learning in adolescents and adults

Previously, we demonstrated that precise temporal coordination between slow oscillations (SOs) and sleep spindles indexes declarative memory network development (Hahn et al., 2020). However, it is unclear whether these findings in the declarative memory domain also apply in the motor memory domain. Here, we compared adolescents and adults learning juggling, a real-life gross-motor task. Juggling […]

Related Product: MotionWatch

Publication Date: February 21, 2022

Multispecies probiotic administration reduces emotional salience and improves mood in subjects with moderate depression: a randomised, double-blind, placebo-controlled study

Background The potential antidepressant properties of probiotics have been suggested, but their influence on the emotional processes that may underlie this effect is unclear. Methods Depressed volunteers (n = 71) were recruited into a randomised double-blind, placebo-controlled study to explore the effects of a daily, 4-week intake of a multispecies probiotic or placebo on emotional […]

Related Product: MotionWatch

Publication Date: February 7, 2022

Effects of a hybrid digital Cognitive Behavioural Therapy for Insomnia and Emotion Regulation in the workplace

Introduction: This trial tests the efficacy of implementing a hybrid digital cognitive behavioural therapy for insomnia (dCBT-I) and emotion regulation (ER) in the workplace. The study protocol follows on the SPIRIT (Standard Protocol Items for Randomized Trials) 2013 recommendations. Methods and analysis: Mixed methods evaluation with a two-arm randomised waitlist control design of a six […]

Related Product: MotionWatch

Publication Date: February 4, 2022

Sleep moderates the effects of Tibetan yoga for women with breast cancer undergoing chemotherapy

This study examined self-reported and actigraphy-assessed sleep and depression as moderators of the effect of a Tibetan yoga intervention on sleep and depression among women undergoing chemotherapy for breast cancer. This is a secondary analysis of an RCT examining a 4-session Tibetan yoga program (TYP; n = 74) versus stretching program (STP; n = 68) or usual care (UC; […]

Related Product: MotionWatch

Publication Date: February 2, 2022

Boosting Recovery During Sleep by Means of Auditory Stimulation

Sufficient recovery during sleep is the basis of physical and psychological well-being. Understanding the physiological mechanisms underlying this restorative function is essential for developing novel approaches to promote recovery during sleep. Phase-targeted auditory stimulation (PTAS) is an increasingly popular technique for boosting the key electrophysiological marker of recovery during sleep, slow-wave activity (SWA, 1–4 Hz […]

Related Product: MotionWatch

Publication Date: February 2, 2022

Order matters: sleep spindles contribute to memory consolidation only when followed by rapid-eye-movement sleep

Sleep is known to benefit memory consolidation, but little is known about the contribution of sleep stages within the sleep cycle. The sequential hypothesis proposes that memories are first replayed during nonrapid-eye-movement (NREM or N) sleep and then integrated into existing networks during rapid-eye-movement (REM or R) sleep, two successive critical steps for memory consolidation. […]

Related Product: MotionWatch

Publication Date: January 17, 2022

SLEEP: intervention with weighted blankets for children with attention deficit hyperactivity disorder (ADHD) and sleep problems: study protocol for a randomised control trial

Introduction and objectives Children with attention deficit hyperactivity disorder (ADHD) have an increased risk of sleep problems. Weighted blankets are one possible non-pharmacological intervention for these problems in this group of children. However, the effectiveness of weighted blankets is insufficiently investigated. This study aims to investigate the effectiveness of weighted blankets in terms of sleep, […]

Related Product: MotionWatch

Publication Date: January 4, 2022

The impact of sleep restriction on skin parameters and facial appearance of 24 women

Background Total sleep deprivation has a visible impact on subjective facial appearance. However, there is a lack of knowledge on how moderate sleep restriction objectively impairs skin quality and facial aspect. Methods Twenty-four healthy good-sleeping women, aged 30-50, volunteered for this study on the impact of sleep restriction (SR) on their facial skin. SR was […]

Related Product: MotionWatch

Publication Date: December 8, 2021

Relationships between quality of sleep and cerebral amyloid load in the elderly

Goal Alzheimer’s disease is characterized by an accumulation of amyloid β proteins (pAβ) in the brain. Recent studies indicate that brain protein extrusion is a physiological phenomenon that takes place during deep sleep phases. The relationship between the accumulation of pAβ and the quality of sleep in the elderly is still poorly understood. Our study […]

Related Product: MotionWatch

Publication Date: December 7, 2021

Using Actigraphy and Heart Rate Variability (HRV) to Assess Sleep Quality and Sleep Arousal of Three App-Based Interventions: Sleep Music, Sleepcasts, and Guided Mindfulness

Reduced sleep quality is pronounced among the majority of the US population and is associated with decreased quality of life. The development of solutions that can aid in improving sleep quality is therefore imperative. This study examined the impact of 3 app-based interventions on physiological regulation of sleep arousal, sleep quality, and cognitive functioning using […]

Related Product: MotionWatch

Publication Date: November 30, 2021

A direct comparison of wrist actigraphy and sleep diaries in measuring sleep in healthy adults

Measuring sleep and sleep quality is an important diagnostic and monitoring tool, and a number of different methods for measurement have been developed over the last half-century. Two prevalent methods include wrist actigraphy and sleep diaries. Both methods can be applied in different circumstances, but both have strengths and weaknesses. This study aimed to identify […]

Related Product: MotionWatch

Publication Date: November 19, 2021

Do Mothers Have Worse Sleep Than Fathers? Sleep Imbalance, Parental Stress, and Relationship Satisfaction in Working Parents

Purpose Previous research indicates that mothers take a larger responsibility for child care during the night and that they have more disturbed sleep than fathers. The purpose of this study was to determine whether such a sleep imbalance exists in working parents of young children, and the extent to which it depends on the way […]

Related Product: MotionWatch

Publication Date: November 2, 2021

Chronotype as self-regulation: morning preference is associated with better working memory strategy independent of sleep

Study objectives We set out to examine how chronotype (diurnal preference) is connected to ability to function in natural conditions where individuals cannot choose their sleep schedule. We conducted a cross-sectional study in military conscript service to test the hypothesis that sleep deprivation mediates the adverse effects of chronotype on cognitive functioning. We also examined […]

Related Product: MotionWatch

Publication Date: October 18, 2021

Do self‐ratings of the Pittsburgh Sleep Quality Index reflect actigraphy recordings of sleep quality or variability? An exploratory study of bipolar disorders versus healthy controls

Sleep disturbances are typical symptoms of acute episodes of bipolar disorder (BD) and differentiate euthymic BD cases from healthy controls (HC). Researchers often employ objective recordings to evaluate sleep patterns, such as actigraphy, whilst clinicians often use subjective ratings, such as the Pittsburgh Sleep Quality Index (PSQI). As evidence suggests the measures may disagree, we […]

Related Product: MotionWatch

Publication Date: October 18, 2021

Prior Exposure and Toddlers’ Sleep-Related Memory for Novel Words

Children can easily link a novel word to a novel, unnamed object—something referred to as fast mapping. Despite the ease and speed with which children do this, their memories for novel fast-mapped words can be poor unless they receive memory supports such as further exposure to the words or sleep. Axelsson, Swinton, Winiger, and Horst […]

Related Product: MotionWatch

Publication Date: October 18, 2021

Chromatic Pupillometry in Isolated Rapid Eye Movement Sleep Behavior Disorder

Background Melanopsin retinal ganglion cell (mRGC)-mediated pupillary light reflex (PLR) abnormalities have been documented in several neurodegenerative disorders including Parkinson’s disease. Overall, isolated rapid eye movement (REM) sleep behavior disorder (iRBD) represents the strongest prodromal risk factor for impending α-synucleinopathies. Objectives To quantitatively compare PLR and mRGC-mediated contribution to PLR in 16 iRBD patients and […]

Related Product: MotionWatch

Publication Date: October 7, 2021

Sleep assessment in patients with Cluster headache – self reported vs observed data

Objective: Cluster Headache (CH) is a primary headache disorder often characterized by a circadian timing of headache attacks. The hypothalamus is reported to be activated during attacks, and several genes involved in the regulation of the molecular clock have been linked to CH. To investigate this further, we analyzed sleep patterns in CH patients compared […]

Related Product: MotionWatch

Publication Date: September 8, 2021

Sleep extension and metabolic health in male overweight/obese short sleepers: A randomised controlled trial

While limited evidence suggests that longer sleep durations can improve metabolic health in habitual short sleepers, there is no consensus on how sustained sleep extension can be achieved. A total of 18 men (mean [SD] age 41 [ 9] years), who were overweight/obese (mean [SD] body mass index 30 [3] kg/m2) and short sleepers at […]

Related Product: MotionWatch

Publication Date: August 20, 2021

Subjective and objective sleep in young people with borderline personality disorder features

Characterising sleep in young people (aged 15–25 years) with borderline personality disorder (BPD) features is crucial given the association between BPD features and sleep disturbance, negative consequences of poor sleep, and normative developmental sleep changes that occur in this age group. The present study aimed to characterise the sleep profile of young people with BPD […]

Related Product: MotionWatch

Publication Date: August 19, 2021

Intravesical Bacillus Calmette-Guerin treatment-induced sleep quality deterioration in patients with non-muscle invasive bladder cancer: functional outcome assessment based on a questionnaire survey and actigraphy

Purpose We investigated sleep parameters and patient-reported outcomes before, during, and after induction Bacillus Calmette-Guerin therapy using questionnaires and actigraphy in patients with non-muscle invasive bladder cancer. Methods We investigated 10 patients who received Bacillus Calmette-Guerin therapy once weekly for 8 weeks. The International Prostate Symptom Score, European Organization for Research and Treatment of Cancer […]

Related Product: MotionWatch

Publication Date: August 16, 2021

Gender differences in BaYaka forager sleep-wake patterns in forest and village contexts

Sleep studies in small-scale subsistence societies have broadened our understanding of cross-cultural sleep patterns, revealing the flexibility of human sleep. We examined sleep biology among BaYaka foragers from the Republic of Congo who move between environmentally similar but socio-ecologically distinct locations to access seasonal resources. We analyzed the sleep–wake patterns of 51 individuals as they […]

Related Product: MotionWatch

Publication Date: July 1, 2021

Self-Reported and Objective Sleep Measures in Stroke Survivors With Incomplete Motor Recovery at the Chronic Stage

Background. Stroke survivors commonly complain of difficulty sleeping. Poor sleep is associated with reduced quality of life and more understanding of long-term consequences of stroke on sleep is needed. Objective. The primary aims were to (1) compare sleep measures between chronic stroke survivors and healthy controls and (2) test for a relationship between motor impairment, […]

Related Product: MotionWatch

Publication Date: July 1, 2021

Emotion Regulation Failures Are Preceded by Local Increases in Sleep-like Activity

Emotion self-regulation relies both on cognitive and behavioral strategies implemented to modulate the subjective experience and/or the behavioral expression of a given emotion. Although it is known that a network encompassing fronto-cingulate and parietal brain areas is engaged during successful emotion regulation, the functional mechanisms underlying failures in emotion suppression (ES) are still unclear. In […]

Related Product: MotionWatch

Publication Date: June 22, 2021

Validity and reliability of the Suggested Immobilization Test for measurement of restless legs syndrome severity in adults with multiple sclerosis

Objective/Background Adults with multiple sclerosis (MS) often present with conditions that mimic restless legs syndrome (RLS), thereby adding complexity into the assessment of RLS severity. The current gold-standard measures of RLS severity rely on a fixed seven-day time frame, which limits the ability of these measures for studying acute changes in RLS severity. The present […]

Related Product: MotionWatch

Publication Date: June 16, 2021

Individual differences in the temporal relationship between sleep and agitation: a single-subject study in nursing home residents with dementia experiencing sleep disturbance and agitation

Objectives Previous studies on the interrelationship between sleep and agitation relied on group-aggregates and so results may not be applicable to individuals. This proof-of-concept study presents the single-subject study design with time series analysis as a method to evaluate the association between sleep and agitation in individual nursing home residents using actigraphy. Method To record […]

Related Product: MotionWatch

Publication Date: June 15, 2021

The CHD8/CHD7/Kismet family links blood-brain barrier glia and serotonin to ASD-associated sleep defects

Sleep disturbances in autism and neurodevelopmental disorders are common and adversely affect patient’s quality of life, yet the underlying mechanisms are understudied. We found that individuals with mutations in CHD8, among the highest-confidence autism risk genes, or CHD7 suffer from disturbed sleep maintenance. These defects are recapitulated in Drosophila mutants affecting kismet, the sole CHD8/CHD7 […]

Related Product: MotionWatch

Publication Date: June 4, 2021

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