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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Is implementing a post-lunch nap beneficial on evening performance, following two nights partial sleep restriction?

We have investigated the effects that partial-sleep-restriction (PSR0, 4-h sleep retiring at 02:30 and waking at 06:30 h for two consecutive nights) have on 07:30 and 17:00 h cognitive and submaximal weightlifting; and whether this performance improves at 17:00 h following a 13:00 h powernap (0, 30 or 60-min). Fifteen resistance-trained males participated in this study. Prior to the […]

Related Product: MotionWatch

Publication Date: October 9, 2023


Deep representation learning identifies associations between physical activity and sleep patterns during pregnancy and prematurity

Preterm birth (PTB) is the leading cause of infant mortality globally. Research has focused on developing predictive models for PTB without prioritizing cost-effective interventions. Physical activity and sleep present unique opportunities for interventions in low- and middle-income populations (LMICs). However, objective measurement of physical activity and sleep remains challenging and self-reported metrics suffer from low-resolution […]

Related Product: MotionWatch

Publication Date: September 28, 2023


Night‐to‐night variability in sleep and amyloid beta burden in normal aging

INTRODUCTION Alzheimer’s disease is associated with sleep disturbances and accumulation of cerebral amyloid beta. The objective was to examine whether actigraphy-detected sleep parameters might be biomarkers for early amyloid burden. METHODS Participants underwent a week of actigraphy and an amyloid positron emission tomography (PET) scan. Sleep duration and continuity disruption (sleep fragmentation and nocturnal awakenings) […]

Related Product: MotionWatch

Publication Date: September 21, 2023


Gender, Pain, and Function Associated With Physical Activity After Hospitalization in Persons Living With Dementia

Background: The purpose of this study was to identify factors that are associated with physical activity after hospitalization in persons living with dementia. Methods: Multiple linear regressions were conducted to test factors associated with objective activity levels (sedentary, low, moderate, and vigorous) among 244 patients living with dementia from a randomized controlled trial. Results: Within […]

Related Product: MotionWatch

Publication Date: September 20, 2023


The Impact of Multisession Sleep-Hygiene Strategies on Sleep Parameters in Elite Swimmers

Purpose: Short sleep duration and poor sleep quality are common in swimmers. Sleep-hygiene strategies demonstrated beneficial effects on several sleep parameters. The present study assessed the impact of a multisession sleep-hygiene training course on sleep in elite swimmers. Methods: Twenty-eight elite swimmers (17 [2] y) participated. The sleep-hygiene strategy consisted of 3 interventions. Sleep was […]

Related Product: MotionWatch

Publication Date: September 14, 2023


Hormone physiology and sleep dynamics among BaYaka foragers of the Congo Basin: Gendered associations between nighttime activity, testosterone, and cortisol

Sleep quality is an important contributor to health disparities and affects the physiological function of the immune and endocrine systems, shaping how resources are allocated to life history demands. Past work in industrial and post-industrial societies has shown that lower total sleep time (TST) or more disrupted nighttime sleep are linked to flatter diurnal slopes […]

Related Product: MotionWatch

Publication Date: September 6, 2023


Bipolar disorder during pregnancy and the postpartum period:: Patients considerations, course of bipolar disorder and impact of sleep loss

The aim of this thesis was to study the course of bipolar disorder (BD) in pregnant women and the influence of sleep during pregnancy and the peripartum period on the development of postpartum mood symptoms. Importantly, we also wanted to explore considerations of women with BD about family planning and pregnancy. Main findings What are […]

Related Product: MotionWatch

Publication Date: September 1, 2023


Patients with cluster headache show signs of insomnia and sleep related stress: results from an actigraphy and self-assessed sleep study

Background Cluster headache (CH) is a primary headache disorder which is characterized by circadian timing of headache attacks, usually at nighttime, in around two thirds of patients. Patients with CH often report sleep difficulties, though it is unknown whether this is a cause or a consequence of nightly headache attacks. Objective In this case-control study […]

Related Product: MotionWatch

Publication Date: August 18, 2023


Testing an Intervention to Improve Post-hospital Outcomes in Persons Living with Dementia and Their Family Care Partners

Background and Objective Hospitalized persons living with dementia are at risk for functional decline, behavioral symptoms of distress, and delirium, all persisting in the post-acute period. In turn, family care partners (FCPs) experience increased anxiety and lack of preparedness for caregiving, compounding existing strain and burden. Family-centered Function-focused Care (Fam-FFC) purposefully engages FCPs in assessment, […]

Related Product: MotionWatch

Publication Date: August 16, 2023


Multiphase Spinal Cord Stimulation in Participants With Chronic Back or Leg Pain: Results of the BENEFIT-02 Randomized Clinical Trial

Objective This study aimed to assess the safety and effectiveness of a new charge-distributed multiphase stimulation paradigm during an extended spinal cord stimulation (SCS) trial. Materials and Methods This prospective, multicenter, randomized, single-blind, feasibility study included participants with chronic low back and/or leg pain and baseline numerical rating scale (NRS) for overall pain intensity ≥6. […]

Related Product: MotionWatch

Publication Date: August 16, 2023


Napping and circadian sleep-wake regulation during healthy aging

Study objectives Daytime napping is frequently reported among the older population and has attracted increasing attention due to its association with multiple health conditions. Here, we tested whether napping in the aged is associated with altered circadian regulation of sleep, sleepiness and vigilance performance. Methods Sixty healthy older individuals (mean age: 69y., 39 women) were […]

Related Product: MotionWatch

Publication Date: August 14, 2023


Clinical and cost-effectiveness of nurse-delivered sleep restriction therapy for insomnia in primary care (HABIT): a pragmatic, superiority, open-label, randomised controlled trial

Background Insomnia is prevalent and distressing but access to the first-line treatment, cognitive behavioural therapy (CBT), is extremely limited. We aimed to assess the clinical and cost-effectiveness of sleep restriction therapy, a key component of CBT, which has the potential to be widely implemented. Methods We did a pragmatic, superiority, open-label, randomised controlled trial of […]

Related Product: MotionWatch

Publication Date: August 10, 2023


Mechanisms and consequences of weight gain after deep brain stimulation of the subthalamic nucleus in patients with Parkinson’s disease

Body weight gain in combination with metabolic alterations has been observed after deep brain stimulation (DBS) of subthalamic nucleus (STN) in patients with Parkinson’s disease (PD), which potentially counteracts the positive effects of motor improvement. We aimed to identify stimulation-dependent effects on motor activities, body weight, body composition, energy metabolism, and metabolic blood parameters and […]

Related Product: MotionWatch

Publication Date: August 8, 2023


Soccer, Sleep, Repeat: Effects of Training Characteristics on Sleep Quantity and Sleep Architecture

Due to the high demands of competitive sports, the sleep architecture of adolescent athletes may be influenced by their regular training. To date, there is no clear evidence on how training characteristics (intensity, time of day, number of sessions) influence sleep quality and quantity. 53 male soccer players (M = 14.36 years, SD = 0.55) […]

Related Product: MotionWatch

Publication Date: August 2, 2023


Educational Concerns About the Safety of Cataract Surgery During Residency: The E3CAPS Pedagogic Study

Cataract surgery is the most common surgical procedure performed in France. While the incidence of intraoperative complications affecting visual prognosis is extremely low, given the large number of patients operated on, the absolute number of patients affected by complications is quite high. Complication rates are significantly higher when ophthalmology residents (ORs) perform the surgery. Although […]

Related Product: MotionWatch

Publication Date: August 2, 2023


Sleep–wake monitoring of people with intellectual disability: Examining the agreement of EMFIT QS and actigraphy

Background Gaining insight into sleep–wake patterns of persons with intellectual disabilities is commonly done using wrist actigraphy. For some people, contactless alternatives are needed. This study compares a contactless bed sensor with wrist actigraphy to monitor sleep–wake patterns of people with moderate to profound intellectual disabilities. Method Data were collected with EMFIT QS (activity and […]

Related Product: MotionWatch

Publication Date: July 25, 2023


The efficacy of weighted blankets for sleep in children with attention‐deficit/hyperactivity disorder—A randomized controlled crossover trial

Weighted blankets are a non-pharmacological intervention for treating sleep and anxiety problems in children with attention-deficit/hyperactivity disorder. However, research on the efficacy of weighted blankets is sparse. The aim of this randomized controlled trial with a crossover design (4 + 4 weeks) was to evaluate the efficacy of weighted blankets on sleep among children with attention-deficit/hyperactivity disorder and […]

Related Product: MotionWatch

Publication Date: July 15, 2023


User experiences of pre-sleep sensory alpha brainwave entrainment for people with chronic pain and sleep disturbance

Aim: To explore the user experiences of pre-sleep alpha entrainment via a smartphone-enabled audio or visual stimulation program for people with chronic pain and sleep disturbance. Materials & methods: Semi-structured interviews were held with 27 participants completing a feasibility study of pre-sleep entrainment use for 4 weeks. Transcriptions were subject to template analysis. Results: Five […]

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Publication Date: July 9, 2023


Concordance of objective and subjective measures of sleep in children with neurodevelopmental conditions: A systematic review and meta-analysis

The purpose of this systematic review and meta-analysis is to delineate the concordance of objective and subjective measures of sleep in children with neurodevelopmental conditions (NDCs). A systematic literature search identified 31 studies that compare objective and subjective estimates of sleep parameters in autism, ADHD or rare genetic syndromes associated with intellectual disability. The meta-analyses […]

Related Product: MotionWatch

Publication Date: July 7, 2023


Effects of Different Exercise Programs on Symptoms, Sleep, and Quality of Life in Patients with Primary Restless Legs Syndrome

Background Restless legs syndrome (RLS) is a sensorimotor disorder that can have a significant detrimental impact on the quality of life and sleep. Objectives Our aim was to examine the effects of aerobic exercise and stretching exercise programs on symptom severity, sleep, and quality of life in patients with primary RLS. Methods A total of […]

Related Product: MotionWatch

Publication Date: July 4, 2023


Physical activity, daytime activity and sleep during a spa stay

INTRODUCTION: Recently, the Spa stay, including facilities (e.g., swimming pools and gyms), and treatments, have been described as incrementing physical activity (PA), sleep quality, and, more generally, the quality of life [1, 2]. To date, no studies have investigated these aspects in sub-healthy subjects visiting Italian Spa; thus, the current study aims to shed light […]

Related Product: MotionWatch

Publication Date: July 1, 2023


Low Doses of Melatonin to Improve Sleep in Children with ADHD: An Open-Label Trial

Objective. Only a few studies assessing the sleep effects of low doses of melatonin (aMT) have been performed in the past, most of them in adults, and only one in subjects with attention-deficit/hyperactivity disorder (ADHD). The aim of this study was to provide evidence of the changes induced by aMT doses as low as 1 […]

Related Product: MotionWatch

Publication Date: June 28, 2023


Conditioning of the Cortisol Awakening Response in Healthy Men: Study Protocol for a Randomized Controlled Trial

Background: The hormone cortisol plays important roles in human circadian and stress physiology and is an interesting target for interventions. Cortisol varies not only in response to stress but also as part of a diurnal rhythm. It shows a particularly sharp increase immediately after awakening, the cortisol awakening response (CAR). Cortisol can be affected by […]

Related Product: MotionWatch

Publication Date: June 19, 2023


Sleep Location and Its Association with Caregiver Sleep Quality During Patient Hospital Admission

During acute hospitalization, many caregivers decide to stay at the care recipient’s bedside over the course of several days or months, coping with a stressful situation and a poor sleeping environment. Our objective was to characterize caregiver sleep–wake cycles during care recipient hospital admission and test the association between sleep location (home versus hospital) and […]

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Publication Date: June 16, 2023


Can air purification improve sleep quality? A 2‐week randomised‐controlled crossover pilot study in healthy adults

Insufficient quantity and quality of sleep is a public health concern that can be addressed by interventions for improving sleep outcomes. Environmental factors such as poor air quality are a potential target for intervention, particularly in light of associations between air pollution and worse sleep. The aim of this pilot study was to investigate the […]

Related Product: MotionWatch

Publication Date: June 1, 2023


Physiological and behavioural effects of intermittent fasting vs daily caloric restriction in meat-type poultry

Intermittent fasting (IF) is the practice of temporal food restriction to promote metabolic switching between a glucose- and a ketone-based metabolism, which has been reported to come with diverse health benefits. IF practices appear to confer many of the advantages of caloric restriction without restricting total energy intake, and studies in both rodents and humans […]

Related Product: MotionWatch

Publication Date: May 30, 2023


Towards a Distinct Sleep and Behavioural Profile of Fetal Alcohol Spectrum Disorder (FASD): A Comparison between FASD, Autism and Typically Developing Children

BACKGROUND: The term Fetal Alcohol Spectrum Disorders (FASD) describes a range of neurodevelopmental conditions, the direct result of prenatal alcohol exposure. FASD encompasses a range of behavioural, cognitive and sleep patterns that are sometimes indiscernible from other neurodevelopmental conditions, one in particular being Autism Spectrum Disorders (ASD). This study aimed to provide a comparison of […]

Related Product: MotionWatch

Publication Date: May 16, 2023


The Suprachiasmatic Nucleus of The Reindeer (Rangifer tarandus tarandus) and it’s Circadian Outputs

The Earth is in constant movement around the Sun – this has created environments with changing light throughout the day and year. Through evolution animals have adapted to this change in light and circadian and circannual rhythms have evolved to enhance fitness and survival. Animals living in the Arctic region have a different relationship to […]

Related Product: MotionWatch

Publication Date: May 14, 2023


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


Sleep Reactivity and Related Factors in Adolescence: An Increased Risk for Insomnia? A Longitudinal Assessment

Purpose The individual vulnerability for stress-related sleep difficulties (eg, sleep reactivity) is known as a predisposing factor of insomnia in adults, yet relatively little is known about sleep reactivity in adolescence. The study goal is to determine factors related to sleep reactivity and to investigate whether sleep reactivity and related factors predict current and new […]

Related Product: MotionWatch

Publication Date: May 10, 2023


Does workplace telepressure get under the skin? Protocol for an ambulatory assessment study on wellbeing and health-related physiological, experiential, and behavioral concomitants of workplace telepressure

Background The daily working life of many employees requires the use of modern information and communication technology (ICT) devices such as computers, tablets, and smartphones. The double-edged nature of digital work environments has been increasingly highlighted. Benefits such as increased flexibility come at a personal cost. One of the potential downsides is workplace telepressure, i.e., […]

Related Product: MotionWatch

Publication Date: May 3, 2023


Exploring the Relationship between Disordered Sleep and Mood in Male Anorexia Nervosa: An Actigraphy Study

Eating disorders (EDs), including anorexia nervosa (AN), are severe psychological disorders that affect individuals’ eating behaviours and body perception. Previous research has shown that people with EDs often report poorer sleep. Some literature has suggested that it is mood dysregulation that mediates the link between EDs and sleep. However, the majority of previous studies only […]

Related Product: MotionWatch

Publication Date: May 2, 2023


Multimodal investigation of melanopsin retinal ganglion cells in Alzheimer’s disease

Objective In Alzheimer’s disease (AD), the presence of circadian dysfunction is well-known and may occur early in the disease course. The melanopsin retinal ganglion cell (mRGC) system may play a relevant role in contributing to circadian dysfunction. In this study, we aimed at evaluating, through a multimodal approach, the mRGC system in AD at an […]

Related Product: MotionWatch

Publication Date: April 23, 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


The evolving role of quantitative actigraphy in clinical sleep medicine

Actigraphy has a consolidated role in Insomnia and Circadian Rhythm Sleep-Wake Disorders (CRSWD) and recent studies have highlighted the use of actigraphy for narcolepsy and REM sleep behaviour disorder (RBD). This review aims at summarising the results of studies published over the last decade regarding the use of actigraphy. Thirty-five studies proved eligible, and results […]

Related Product: MotionWatch

Publication Date: April 1, 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


Rest-Activity Rhythm, Pain, and Motor Activity in Multiple Sclerosis

BACKGROUND Although the relationships among physical disability, mood disorders, and pain are well described in multiple sclerosis (MS), little is known about whether those symptoms are associated with sleep disturbances. METHODS Forty-six patients with MS experiencing pain participated. Sleep was indirectly measured by assessing rest-activity rhythm via actigraphy: interdaily stability, intradaily variability, and relative amplitude. […]

Related Product: MotionWatch

Publication Date: March 8, 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


Dynamics of working memory process revealed by independent component analysis in an fMRI study

Human memory is prone to errors in many everyday activities but also when cultivating hobbies such as traveling and/or learning a new language. For instance, while visiting foreign countries, people erroneously recall foreign language words that are meaningless to them. Our research simulated such errors in a modified Deese-Roediger-McDermott paradigm for short-term memory with phonologically […]

Related Product: MotionWatch

Publication Date: February 18, 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


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