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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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, […]
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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 […]
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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, […]
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Publication Date: January 26, 2023
Feeling and mental stress when wearing an oral appliance for obstructive sleep apnea syndrome: Comparison of mono-block type and two-piece type
One of the treatments for obstructive sleep apnea syndrome (OSAS) is the use of an oral appliance (OA). Although many papers have shown a certain degree of effectiveness in treating OA, one of the drawbacks of the device is the discomfort and mental burden it causes when worn. One of the reasons for this is […]
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Publication Date: January 1, 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 […]
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Publication Date: December 29, 2022
Function Focused Care For Acute Care: Overcoming Recruitment, Measurement, And Implementation Post-Covid-19
To help patients spend more time engaged in physical activities and avoid the complications that occur Function Focused Care for Acute Care was developed (FFC-AC-EIT). FFC-AC-EIT includes the implementation of four steps: (1) Environment and policy assessments; (2) Education of staff; (3) Establishing patient goals; and (4) Mentoring and motivating of staff, patients, and families. […]
Related Product: MotionWatch
Publication Date: December 20, 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 […]
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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 […]
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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. […]
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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 […]
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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 […]
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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 […]
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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 […]
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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 […]
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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 […]
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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 […]
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Publication Date: November 4, 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, […]
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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 […]
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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 […]
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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
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
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