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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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
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
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 […]
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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 […]
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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
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
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
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
MotionWatch 8 Wrist Activity and Light Analysis: from ambulatory recording toward real life monitoring
Background The Author’s interest is to apply physiological recordings for real-life, long-term and unsupervised monitoring as a complement to telemedicine and home care. This means the search for parameters that will be used to alert when some kind of support will be needed. To this end, the Author has recorded and published an appropriate Motionwatch8 […]
Related Product: MotionWatch
Publication Date: June 23, 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
Bright Light Increases Alertness and Not Cortisol in Healthy Men: A Forced Desynchrony Study Under Dim and Bright Light
Light-induced improvements in alertness are more prominent during nighttime than during the day, suggesting that alerting effects of light may depend on internal clock time or wake duration. Relative contributions of both factors can be quantified using a forced desynchrony (FD) designs. FD designs have only been conducted under dim light conditions (
Related Product: MotionWatch
Publication Date: June 10, 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 between circadian misalignment and telomere length in BD: an actigraphy study
Background Life expectancy is significantly decreased in bipolar disorder (BD). This is associated with accelerated cellular aging which can be estimated by telomere length (TL). However, specific determinants of shorter TL in BD are under-explored. This study examines whether circadian misalignment (i.e. mismatch between preferred and actual phase of circadian activity rhythms) is associated with […]
Related Product: MotionWatch
Publication Date: May 27, 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
The Exponentially Weighted Moving Average Procedure for Detecting Changes in Intensive Longitudinal Data in Psychological Research in Real-Time: A Tutorial Showcasing Potential Applications
Affect, behavior, and severity of psychopathological symptoms do not remain static throughout the life of an individual, but rather they change over time. Since the rise of the smartphone, longitudinal data can be obtained at higher frequencies than ever before, providing new opportunities for investigating these person-specific changes in real-time. Since 2019, researchers have started […]
Related Product: MotionWatch
Publication Date: May 22, 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
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
Effect of Light Exposure on Serum Melatonin Levels of ICU Patients: A Preliminary Observational Study
Aim: To examine whether the serum melatonin levels in ICU patients are affected by light exposure in the “light” and “dark” parts of the ICU. Method: We measured serum melatonin levels of 10 ICU patients having their bed positioned in the “light part” (artificial and natural light) and “dark part” (only artificial light) of the […]
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
The activity patterns of nonworking and working sled dogs
There are limited studies investigating the combined effects of biological, environmental, and human factors on the activity of the domestic dog. Sled dogs offer a unique opportunity to examine these factors due to their close relationship with handlers and exposure to the outdoors. Here, we used accelerometers to measure the activity of 52 sled dogs […]
Related Product: MotionWatch
Publication Date: May 14, 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
Rest-Activity Circadian Rhythm and Light Exposure Using Wrist Actigraphy in ICU Patients
Actigraphy (ACTG) is easy to use and has proved reliable in non-critical populations of patients. It has been used to track circadian rest-activity cycles and to identify states of wakefulness and sleep [1]. A more recent study has found that ACTG have a moderate level of agreement with PSG in distinguishing between sleep and wakeful […]
Related Product: MotionWatch
Publication Date: April 18, 2022
Globus Pallidus internus deep brain stimulation: An alternative treatment for Epilesia partialis continua
Resective surgery may involve an unacceptable risk of permanent neurological deficits in drug-resistant epilepsies so alternative strategies are required. In this regard, palliative neuromodulation has shown promise [[1]]. Epilepsia partialis continua (EPC) is an epileptic syndrome defined as a subclass of focal motor status epilepticus manifesting with frequent repetitive epileptic myoclonia affecting the limbs and/or […]
Related Product: MotionWatch
Publication Date: April 17, 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
Efficacy of light therapy for cancer-related fatigue in (non-) Hodgkin Lymphoma survivors: results of a randomized controlled trial
Cancer-related fatigue is one of the most frequently reported symptoms after treatment for (non-)Hodgkin lymphoma. This dissertation describes the procedure and results of the SPARKLE trial which primarily aimed to investigate whether light therapy can be used as a treatment for chronic cancer-related fatigue since the diagnosis of Hodgkin lymphoma or diffuse large B-cell lymphoma. […]
Related Product: MotionWatch
Publication Date: March 24, 2022
Time Course of Motor Sleep Inertia Dissipation According to Age
Sleep inertia (SI) refers to a complex psychophysiological phenomenon observed after morning awakening that can be described as the gradual recovery of waking-like status after a night of sleep. The time course of SI dissipation in an everyday life condition is little studied. The present study aims to investigate the SI dissipation in motor activity, […]
Related Product: MotionWatch
Publication Date: March 23, 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
Testing Function Focused Care for Acute Care using the Evidence Integration Triangle: Protocol description
This manuscript provides the protocol for a National Institute of Aging-funded cluster randomized clinical trial that focuses on helping nurses in acute care to engage patients with dementia in physical activity while hospitalized using an approach referred to as function-focused care. Physical activity is defined as bodily movement produced by skeletal muscles resulting in the […]
Related Product: MotionWatch
Publication Date: March 11, 2022
Impact of sleep timing on attention, sleepiness, and sleep quality among real-life night shift workers with shift work disorder: a cross-over clinical trial
Study objectives: To examine the effect of sleep timing intervention on sleep quality, attention, and sleepiness at work among night shift workers with shift work disorder. Methods: We recruited 60 real-life night shift workers through advertisements to participate this cross-over clinical trial. Shift work disorder was confirmed with interview and sleep log. Participants were designated […]
Related Product: MotionWatch
Publication Date: March 10, 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
Circadian and Sleep Modulation of Dreaming in Women with Major Depression
Growing evidence indicates an association between reduced dream recall and depressive symptomatology. Here, we tested the prediction that reduced dream recall in individuals experiencing major depressive disorder (MDD) is due to alterations in circadian and sleep processes. Nine young healthy women (20–31 years) and eight young unmedicated women (20–31 years) diagnosed with MDD underwent a […]
Related Product: MotionWatch
Publication Date: February 28, 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
Do holidays change subjective sleep length or sleep debt in shift work disorder?
In shift work disorder (SWD), disturbed sleep acutely impairs employees’ recovery, but little attention has been paid to sleep during longer recovery periods. We examined how holidays affect self-estimated sleep length, sleep debt, and recovery in cases of SWD. Twenty-one shift workers with questionnaire-based SWD and nine reference cases without SWD symptoms completed a questionnaire […]
Related Product: MotionWatch
Publication Date: February 15, 2022
Chronic circadian disruption on a high-fat diet impairs glucose tolerance
Background Nearly 14% of Americans experience chronic circadian disruption due to shift work, increasing their risk of obesity, diabetes, and other cardiometabolic disorders. These disorders are also exacerbated by modern eating habits such as frequent snacking and consumption of high-fat foods. Methods We investigated the effects of recurrent circadian disruption (RCD) on glucose metabolism in […]
Related Product: MotionWatch
Publication Date: February 9, 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
Cross-sectional study of intraocular cataract lens replacement, circadian rest-activity rhythms and sleep quality in older adults
Study objectives: Age-related cataract decreases light transmission at the most sensitive spectrum for circadian photoentrainment, with negative ramifications for human health. Here, we assessed whether intraocular lens replacement (IOL) in older patients with previous cataract was associated with increased stability and amplitude of circadian rest-activity rhythms, and sleep quality. Methods: Our cross-sectional study included sixteen […]
Related Product: MotionWatch
Publication Date: January 27, 2022
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