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.
Filter by product, application, keyword, author or use free text search to locate your area of interest.
Sleep IntervEntion as Symptom Treatment for ADHD (SIESTA)-Blended CBT sleep intervention to improve sleep, ADHD symptoms and related problems in adolescents with ADHD: Protocol for a randomised controlled trial
Introduction Adolescents with attention deficit hyperactivity disorder (ADHD) experience a more disrupted sleep and more sleep problems compared with typically developing adolescents. This is particularly concerning, because disrupted sleep is related to worsened clinical, neurocognitive and functional outcomes and leads to increased ADHD symptom impairment. Due to the specific difficulties adolescents with ADHD experience, a […]
Related Product: MotionWatch
Publication Date: May 13, 2023
Development of a Web Interface for the Dynamic Visualization of Evaluation Test Results to Improve the Follow-up for French Elite Athletes
Currently, the SEP laboratory has developed a system to automatically generate PDF reports summarizing the results of evaluation tests. This system works well in production but has several limitations. In fact, the use of OriginPro software is an obstacle because of the need for a paid license and hence its use is often limited to […]
Related Product: MotionWatch
Publication Date: April 6, 2023
Improving sleep and learning in rehabilitation after stroke, part 2 (INSPIRES2): study protocol for a home-based randomised control trial of digital cognitive behavioural therapy (dCBT) for insomnia
Introduction Consolidation of motor skill learning, a key component of rehabilitation post-stroke, is known to be sleep dependent. However, disrupted sleep is highly prevalent after stroke and is often associated with poor motor recovery and quality of life. Previous research has shown that digital cognitive behavioural therapy (dCBT) for insomnia can be effective at improving […]
Related Product: MotionWatch
Publication Date: April 6, 2023
Effectiveness of home-based videoconference interventions through Physical Exercise Training, Bright Light Exposure and Galvanic Vestibular Stimulation on Sleep in Older Adults: Study Protocol for a Randomized Controlled Trial
Background: Aging is characterized by substantial changes in sleep architecture that negatively impact physical fitness, quality of life, mood or cognitive functioning. Older adults often fail to reach the recommended amount of physical activity to prevent the age-related decline sleep function, partly because of geographical barriers. Home-based interventions could overcome these barriers preventing older adults […]
Related Product: MotionWatch
Publication Date: March 30, 2023
Risk Ahead: Actigraphy-based early-warning signals of increases in depressive symptoms during antidepressant discontinuation
Antidepressant discontinuation increases the risk of experiencing depressive symptoms. In a repeated single-subject design, we tested whether transitions in depression were preceded by increases in actigraphy-based critical-slowing-down-based early-warning signals (EWSs; variance, kurtosis, autocorrelation), circadian-rhythm-based indicators, and decreases in mean activity levels. Four months of data from 16 individuals with a transition in depression and nine […]
Related Product: MotionWatch
Publication Date: March 25, 2023
Light-induced Melatonin Suppressions by 1000-Hz Flickering and Nonflickering Blue Light Conditions
Night bright light is known to suppress melatonin secretion. However, novel photoreceptors, named intrinsically photosensitive retinal ganglion cells, are mainly responsible for projecting dark/bright information to the superchiasmatic nucleus and thus regulating the circadian system. It has been shown that a 100-Hz flickering light suppresses melatonin secretion more than the nonflickering one even if the […]
Related Product: MotionWatch
Publication Date: March 15, 2023
Investigating mental defeat in individuals with chronic pain: Protocol for a longitudinal experience sampling study
Introduction Previous qualitative and cross-sectional research has identified a strong sense of mental defeat in people with chronic pain who also experience the greatest levels of distress and disability. This study will adopt a longitudinal experience sampling design to examine the within-person link between the sense of mental defeat and distress and disability associated with […]
Related Product: MotionWatch
Publication Date: March 6, 2023
Lack of Diurnal Variation in Salivary Cortisol Is Linked to Sleep Disturbances and Heightened Anxiety in Adolescents with Williams Syndrome
Objective: The aim of the current study was to examine the potential relationship between sleep patterns, cortisol levels, and anxiety profiles in adolescents with Williams Syndrome (WS) compared to typically developing adolescents. Method: Thirteen adolescents with WS and thirteen TD adolescents (age range 12–18 years) were recruited. Participants were provided with a “testing kit”, containing […]
Related Product: MotionWatch
Publication Date: March 3, 2023
Genetic background to attention deficit and hyperactivity disorder and attention deficit and hyperactivity disorder symptoms at the age of 5 years: the role of sleep duration
Study Objectives We studied the associations between polygenic risk score (PRS) for attention deficit and hyperactivity disorder (ADHD) and (1) ADHD symptoms in 5-year-old children, (2) sleep duration throughout childhood, and (3) the interaction between PRS for ADHD and short sleep duration relative to ADHD symptoms at 5 years. Methods This study is based on […]
Related Product: MotionWatch
Publication Date: March 1, 2023
Internal desynchronization of circadian rhythms in 14 “free run” people living in a cave – Mission Deep Time
Objective Since the 1960s, it has been established that the endogenous rhythm of the circadian clock is approximately 24.5 h in the absence of any time donor. The objective of our study is to determine if a group of people living out of time will present the same rhythm as previously observed and if this […]
Related Product: MotionWatch
Publication Date: March 1, 2023
Phenotypic divergence in sleep and circadian cycles linked by affective state and environmental risk related to psychosis
Study Objectives Environmental cues influence circadian rhythm timing and neurochemicals involved in the regulation of affective behavior. How this interplay makes them a probable nonspecific risk factor for psychosis is unclear. We aimed to identify the relationship between environmental risk for psychosis and circadian timing phenotypes sampled from the general population. Methods Using an online […]
Related Product: MotionWatch
Publication Date: March 1, 2023
A feasibility study of pre-sleep audio and visual alpha brain entrainment for people with chronic pain and sleep disturbance
Introduction: Chronic pain and sleep disturbance are bi-directionally related. Cortical electrical activity in the alpha frequency band can be enhanced with sensory stimulation via the phenomenon of entrainment, and may reduce pain perception. A smartphone based programme which delivers 10 Hz stimulation through flickering light or binaural beats was developed for use at night, pre-sleep, with […]
Related Product: MotionWatch
Publication Date: February 23, 2023
Combining actigraphy and experience sampling to assess physical activity and sleep in patients with psychosis: A feasibility study
Background: Sleep disorders and reduced physical activity are common in patients with psychosis and can be related to health-related outcomes such as symptomatology and functioning. Mobile health technologies and wearable sensor methods enable continuous and simultaneous monitoring of physical activity, sleep, and symptoms in one’s day-to-day environment. Only a few studies have applied simultaneous assessment […]
Related Product: MotionWatch
Publication Date: February 23, 2023
Improving sleep after stroke: a randomised controlled trial of digital cognitive behavioural therapy for insomnia
Stroke is frequently accompanied by long-term sleep disruption. We therefore aimed to assess the efficacy of digital cognitive behavioural therapy (dCBT) for insomnia to improve sleep after stroke. A parallel group randomised controlled trial was conducted remotely in participant’s homes/online. Randomisation was online with minimisation of between-group differences in age and baseline Sleep Condition Indicator […]
Related Product: MotionWatch
Publication Date: February 8, 2023
Sleep problems in children with Angelman Syndrome: The effect of a behavioral intervention program
Background & aims The aim of this study was to investigate the effect of a behavioral intervention on sleep problems, which are significant and an unmet clinical need in children with Angelman Syndrome (AS). Methods & procedures Children (2–18 years) with AS and sleep problems were randomized to a behavioral intervention program or a control […]
Related Product: MotionWatch
Publication Date: February 6, 2023
Open-source Python routines for the analysis of personalized light exposure data
Light exposure fundamentally influences human physiology and behavior, with light being the most important zeitgeber of the circadian system. Throughout the day, people are exposed to various scenes differing in light level, spectral composition and spatiotemporal properties. Personalized light exposure can be measured through wearable light loggers and dosimeters, including wrist-worn actimeters containing light sensors, […]
Related Product: MotionWatch
Publication Date: February 1, 2023
Effects of short naps during simulated night shifts on alertness and cognitive performance in young adults
While short daytime naps have been found to provide alertness and performance benefits without inducing sleep inertia, the effects of a similar napping strategy during nights shifts are largely unknown. This study examined the effects of a 20-min nap (scheduled at 2:00 a.m.) during night shifts among 16 participants (mean [SD] age 22.0 [1.08] years) who […]
Related Product: MotionWatch
Publication Date: January 26, 2023
Peripheral blood flow estimated by laser doppler flowmetry provides additional information about sleep state beyond that provided by pulse rate variability
Pulse rate variability (PRV), derived from Laser Doppler flowmetry (LDF) or photoplethysmography, has recently become widely used for sleep state assessment, although it cannot identify all the sleep stages. Peripheral blood flow (BF), also estimated by LDF, may be modulated by sleep stages; however, few studies have explored its potential for assessing sleep state. Thus, […]
Related Product: MotionWatch
Publication Date: January 26, 2023
Effects of Near-Infrared Light on Well-Being and Health in Human Subjects with Mild Sleep-Related Complaints: A Double-Blind, Randomized, Placebo-Controlled Study
In Western societies, people spend most of their waking hours indoors, exposing themselves to virtually no sunlight. Natural sunlight contains all visible and non-visible spectral characteristics of light. Both play key roles in human health and well-being. In this particular context, the non-visible near-infrared light has been shown to be beneficial for a wide range […]
Related Product: MotionWatch
Publication Date: December 29, 2022
Theoretical construct into blocks of actigraphic-derived sleep parameters
Actigraphic parameters can provide indication of people’s sleep quality during their daily lives. However, there is a need for clear guidelines on the understanding of the different actigraphic parameters. The present study aims to propose a conceptual and theoretical framework for known actigraphic-derived parameters, which is able to describe the alternation between rest and wake […]
Related Product: MotionWatch
Publication Date: December 19, 2022
The effects of individual music therapy in nursing home residents with dementia to improve general well-being: study protocol of a randomized controlled trial
Background: Dementia is often associated with Neuropsychiatric Symptoms (NPS) such as agitation, depression, hallucinations, anxiety, that can cause distress for the resident with dementia in long-term care settings and can impose emotional burden on the environment. NPS are often treated with psychotropic drugs, which, however, frequently cause side effects. Alternatively, non-pharmacological treatments approaches can improve […]
Related Product: MotionWatch
Publication Date: December 16, 2022
Circadian phase advances in children during camping life according to the natural light-dark cycle
Background It is known that the circadian rhythm phase in adults can be advanced in a natural light-dark cycle without electrical lighting. However, the effect of advanced sleep-wake timing according to the natural light-dark cycle on children’s circadian phase is unclear. We investigated the effects of approximately 2 weeks of camping life with little access […]
Related Product: MotionWatch
Publication Date: December 16, 2022
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
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
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
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
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
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 […]
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
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
Page 1 of 9