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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Found 152 Results

Is disruption of sleep quality a consequence of severe Covid-19 infection?

The Covid-19 outbreak put enormous stress on the health system worldwide, and objective data to handle the emergency are still needed. We aimed to objectively assess the consequence of severe symptoms of Covid-19 infection on sleep quality through wrist actigraphy monitoring of four patients during the sub-acute recovery stage of the disease. The sleep of […]

Related Product: MotionWatch

Publication Date: June 23, 2020


Toward a Better Understanding of the Reciprocal Relations Between Adolescent Psychological Need Experiences and Sleep

In two diary studies, we examined the reciprocal daily association between the satisfaction and frustration of adolescents’ basic psychological needs and sleep, and the role of stress and fatigue in these associations. In Study 1 (N = 211; 52% female; Mage = 15.86 years, SD = 1.18 years), daily need experiences were unrelated to daily […]

Related Product: MotionWatch

Publication Date: June 19, 2020


Light effects on circadian and homeostatic regulation: alertness increases independent of time awake

Study Objectives To determine how sleepiness and sleep deprivation drive the motivation to engage in different behaviors. Methods We studied the sleepiness of 123 participants who had been randomized to sleep deprivation or normal sleep, and their willingness to engage in a range of everyday behaviors. Results Self-reported sleepiness was a strong predictor of the […]

Related Product: MotionWatch

Publication Date: June 6, 2020


Early manifestation of sleep problems in toddlers with Williams Syndrome using a mixed method longitudinal approach

Children with neurodevelopmental disorders commonly experience sleep problems. Williams Syndrome (WS), a rare genetic disorder characterised by a complex, uneven cognitive profile, is no exception. Compared with children with typical development (TD), school-aged children with WS experience significant sleep disruption: shorter sleep duration, more night wakings, greater bedtime resistance and excessive daytime tiredness. In children […]

Related Product: MotionWatch

Publication Date: June 3, 2020


Sleep duration, sleep variability, and impairments of visual attention

Attentional networks are sensitive to sleep deprivation. However, variation in attentional performance as a function of normal sleep parameters is understudied. We examined whether attentional performance is influenced by (a) individual differences in sleep duration, (b) sleep duration variability, and/or (c) their interaction. A total of 57 healthy participants (61.4% female, Mage = 32.37 years, SD = 8.68) completed questionnaires, […]

Related Product: MotionWatch

Publication Date: June 1, 2020


Gateways, Disparities, and Finals Week, Oh My! Translating Sleep Science from the Laboratory to the Classroom

Introduction Organic chemistry can be an insurmountable “gateway” course for otherwise-qualified students in pre-health pathways. Recent data indicate that organic chemistry increases drop-out risk for females and underrepresented minority students (URMs), raising the provocative possibility that sleep disparities are an underrecognized contributor to achievement gaps in gateway STEM courses. Methods In Study 1, 481 students […]

Related Product: MotionWatch

Publication Date: May 27, 2020


Subjective–objective sleep discrepancy in patients with insomnia during and after cognitive behavioural therapy: An actigraphy study

Although patients with insomnia often show a discrepancy between self‐reported and objective sleep parameters, the role of and change in this phenomenon during treatment remain unclear. The present study aimed to assess the effect of cognitive behavioural therapy for insomnia on subjective and objective sleep discrepancy of total sleep time, sleep‐onset latency and wake after […]

Related Product: MotionWatch

Publication Date: May 20, 2020


Effect of a Multimodal Lifestyle Intervention on Sleep and Cognitive Function in Older Adults with Probable Mild Cognitive Impairment and Poor Sleep: A Randomized Clinical Trial

Background:Poor sleep is common among older adults with mild cognitive impairment (MCI) and may contribute to further cognitive decline. Whether multimodal lifestyle intervention that combines bright light therapy (BLT), physical activity (PA), and good sleep hygiene can improve sleep in older adults with MCI and poor sleep is unknown. Objective:To assess the effect of a […]

Related Product: MotionWatch

Publication Date: May 19, 2020


Observation and interview-based diurnal sleepiness inventory for measurement of sleepiness in patients referred for narcolepsy or idiopathic hypersomnia

STUDY OBJECTIVES:First, to determine whether the three-item ODSI (Observation and interview based Diurnal Sleepiness Inventory) measures the degree of excessive daytime sleepiness (EDS) in patients with suspected narcolepsy or idiopathic hypersomnia (IH). Second, to assess the correlation between the ODSI and the Epworth Sleepiness Scale (ESS) as well as objective polysomnographic measurements. Third, to test […]

Related Product: MotionWatch

Publication Date: May 14, 2020


Feasibility of a complex setting for assessing sleep and circadian rhythmicity in a Fragile X cohort

Introduction Sleep, circadian rhythms, (mental) health, and development are assumed to be intertwined. However, differentiated and reliable parameters of sleep and circadian rhythms are particularly difficult to assess for Fragile X (FXS) individuals. As those parameters need to be observed in complex settings, the feasibility of measurements for people with FXS was to be proven. […]

Related Product: MotionWatch

Publication Date: May 14, 2020


Schizophrenia-associated variation at ZNF804A correlates with altered experience-dependent dynamics of sleep slow-waves and spindles in healthy young adults

Background The rs1344706 polymorphism in ZNF804A is robustly associated with schizophrenia (SZ), yet brain and behavioral phenotypes related to this variant have not been extensively characterized. In turn, SZ is associated with abnormal non-rapid eye movement (NREM) sleep neurophysiology. To examine whether rs1344706 is associated with intermediate neurophysiological traits in the absence of disease, we […]

Related Product: MotionWatch

Publication Date: May 3, 2020


Sleep disturbance in atopic dermatitis: a case–control study using actigraphy and smartphone‐collected questionnaires

Introduction Atopic dermatitis (AD) has a significant impact on quality of life, particularly related to sleep disorders secondary to pruritus. The aim of this study was to assess the sleep of patients with AD and compare it to that of healthy volunteers (SV) using a wrist activity monitor and a smartphone app. Material and methods […]

Related Product: MotionWatch

Publication Date: April 22, 2020


Refining sleep measurement using the Motionwatch8©: How many days of monitoring do we need to get reliable estimates of sleep quality for older adults with Mild Cognitive Impairment?

Background Mild cognitive impairment (MCI) is a transition stage between healthy cognition and dementia, and is linked to poorer sleep. Objective, reliable, and low-burden field methods to measure older adult sleep are also currently needed. The MotionWatch8© (MW8) wrist-worn actigraph provides estimates of sleep with 14 days of observation; however, there may be underlying differences […]

Related Product: MotionWatch

Publication Date: April 3, 2020


Fractal biomarker of activity in patients with bipolar disorder

Background The output of many healthy physiological systems displays fractal fluctuations with self-similar temporal structures. Altered fractal patterns are associated with pathological conditions. There is evidence that patients with bipolar disorder have altered daily behaviors. Methods To test whether fractal patterns in motor activity are altered in patients with bipolar disorder, we analyzed 2-week actigraphy […]

Related Product: MotionWatch

Publication Date: April 1, 2020


Napping in high-performance athletes: sleepiness or sleepability?

Daytime napping is a common practice in high-performance athletes, and is widely assumed to reflect sleepiness arising from sports-related sleep debt. The possibility that athlete naps may also be indicative of ‘sleepability’, a capacity to nap on demand that is only weakly related to homeostatic sleep pressure, has not previously been tested. The present study […]

Related Product: MotionWatch

Publication Date: March 16, 2020


Prospective association between suicide cognitions and emotional responses to a laboratory stressor: The mediating role of nightly subjective sleep quality

Background Sleep is a reliable correlate of suicidal thoughts and behaviors (STBs), yet few studies have directly examined negative affect in the context of this association. The present study combined daily experience methods with a laboratory paradigm to investigate suicide cognitions as a predictor of emotional responses to environmental stressors, and tested the role of […]

Related Product: MotionWatch

Publication Date: March 15, 2020


Sleep and intrusive memories immediately after a traumatic event in emergency department patients

Study objectives Intrusive memories of psychological trauma are a core clinical feature of posttraumatic stress disorder (PTSD), and in the early period post-trauma may be a potential target for early intervention. Disrupted sleep in the weeks post-trauma is associated with later PTSD. The impact of sleep and intrusive memories immediately post-trauma, and their relation to […]

Related Product: MotionWatch

Publication Date: March 5, 2020


Acupuncture for insomnia with short sleep duration: protocol for a randomised controlled trial

Introduction Insomnia with short sleep duration has a more serious negative impact on patient health. The existing literature suggests that medication therapy is more effective for this phenotype of insomnia compared with cognitive–behavioural therapy. However, the potential side effects of hypnotic medications hinder their clinical application. Acupuncture has been widely used in the treatment of […]

Related Product: MotionWatch

Publication Date: March 1, 2020


Primary care treatment of insomnia: study protocol for a pragmatic, multicentre, randomised controlled trial comparing nurse-delivered sleep restriction therapy to sleep hygiene (the HABIT trial)

Introduction Insomnia is a prevalent sleep disorder that negatively affects quality of life. Multicomponent cognitive-behavioural therapy (CBT) is the recommended treatment but access remains limited, particularly in primary care. Sleep restriction therapy (SRT) is one of the principal active components of CBT and could be delivered by generalist staff in primary care. The aim of […]

Related Product: MotionWatch

Publication Date: March 1, 2020


Correlates of disrupted sleep–wake variables in patients with advanced cancer

Objectives High rates of sleep difficulties have been found in patients with advanced cancer. However, not much is known about factors that are associated with sleep impairments in this population and that could constitute their potential risk factors or consequences. This study conducted in patients with cancer receiving palliative care aimed to evaluate the relationships […]

Related Product: MotionWatch

Publication Date: February 19, 2020


Sleep disruption after brain injury is associated with worse motor outcomes and slower functional recovery

Background and Aims: Sleep is important for consolidation of motor learning, but brain injury may affect sleep continuity and therefore rehabilitation outcomes. This study aims to assess the relationship between sleep quality and motor recovery in brain injury patients receiving inpatient rehabilitation. Methods: 59 patients with brain injury were recruited from two specialist inpatient rehabilitation […]

Related Product: MotionWatch

Publication Date: February 18, 2020


Scheduled afternoon–evening sleep leads to better night shift performance in older adults

Objectives This study investigated whether an intervention designed to reduce homeostatic sleep pressure would improve night shift performance and alertness in older adults. Methods Non-shift workers aged 57.9±4.6 (mean±SD) worked four day (07:00–15:00) and four night shifts (23:00–07:00). Two intervention groups were instructed to remain awake until ~13:00 after each night shift: the sleep timing group (ST; […]

Related Product: MotionWatch

Publication Date: February 13, 2020


Implementing a hybrid cognitive-behavioural therapy for pain-related insomnia in primary care: Lessons learned from a mixed-methods feasibility study

Objectives To test the feasibility of implementing a brief but intensive hybrid cognitive behavioural therapy (Hybrid CBT) for pain-related insomnia. Design Mixed-methods, with qualitative process evaluation on a two-arm randomised controlled feasibility trial. Setting Primary care. Participants Twenty-five adult patients with chronic pain and insomnia. Intervention Hybrid CBT or self-help control intervention. Primary and secondary outcome measures Primary outcomes measures were […]

Related Product: MotionWatch

Publication Date: February 1, 2020


Transitions in Depression (TRANS-ID) Recovery: Study protocol for a repeated intensive longitudinal n= 1 study design to search for personalized early warning signals of critical transitions towards improvement in depression

The Transitions in Depression (TRANS-ID) Recovery study is aimed at gathering intensive longitudinal data in a group of depressed patients during psychological therapy. Per person, we gathered between 500-600 momentary measurements of mood (5 times a day, for 4 months) using the Experience Sampling Method (ESM), as well as weekly symptom checklists and heart rate […]

Related Product: MotionWatch

Publication Date: February 1, 2020


Insomnia does not affect heart rate changes when young adults watch humorous films: An exploratory study

Emotional reactivity in insomnia is affected both subjectively and on a physiological level for negative emotional material, but little is known about reactions to positive stimuli. We here investigated whether in younger adult insomnia patients, presentation of short humorous films would lead to heart rate decreases during and after film viewing, as compared to heart […]

Related Product: MotionWatch

Publication Date: December 23, 2019


The Teensleep Study: the effectiveness of a school-based sleep education programme at improving early adolescent sleep.

Objective To evaluate the impact of a school-based sleep education programme on adolescent sleep and sleep knowledge. Methods This is the first outcome report on ‘Teensleep’: a novel, teacher-led programme, comprising ten lessons that can be delivered flexibly. Students in Year 10 (n = 1504; mean age = 14.14 ± 0.35 years) from ten UK […]

Related Product: MotionWatch

Publication Date: December 7, 2019


Sleepiness as motivation: a potential mechanism for how sleep deprivation affects behavior

Study Objectives To determine how sleepiness and sleep deprivation drive the motivation to engage in different behaviors. Methods We studied the sleepiness of 123 participants who had been randomized to sleep deprivation or normal sleep, and their willingness to engage in a range of everyday behaviors. Results Self-reported sleepiness was a strong predictor of the […]

Related Product: MotionWatch

Publication Date: November 29, 2019


Sleep quality and clinical and psychological manifestations in women with mild systemic lupus erythematosus activity compared to women with fibromyalgia: A preliminary study

Objectives: This study analyzed sleep quality in fibromyalgia (FM) and systemic lupus erythematosus (SLE) and explored its relationship with other clinical and psychological manifestations. Methods: Twenty women with FM, 19 women with SLE and 22 healthy women participated in the study. Subjective sleep quality, fatigue, pain, depression and anxiety were evaluated with self-reports, and objective […]

Related Product: MotionWatch

Publication Date: November 14, 2019


Dynamic metabolic changes in the human thalamus at the transition from waking to sleep-insights from simultaneous MR spectroscopy and polysomnography

An important contribution of the thalamus to the transition from wakefulness to sleep is a consistent finding in animal studies. In humans, only little is currently known about the specific role of the thalamus in regulating wake-sleep transitions. Although changes in thalamic blood flow and activity have been reported, the underlying molecular mechanisms have not […]

Related Product: MotionWatch

Publication Date: October 30, 2019


Use of an ANN to Value MTF and Melatonin Effect on ADHD Affected Children

Sleep disorders is one of the most frequent child medical consultation, indeed the rate of children that suffer it in a transitory way is considerably high. Among the most common sleep disorders is named ”children behavioral insomnia”, many different drugs has been used as treatment with poor results with relevant secondary effects. We focus on […]

Related Product: MotionWatch

Publication Date: September 26, 2019


A Deep Learning Approach for Sleep-Wake Detection from HRV and Accelerometer Data

Sleep-wake classification is important for measuring the sleep quality. In this paper, we propose a novel deep learning framework for sleep-wake detection by using acceleration and heart rate variability (HRV) data. Firstly, considering the high sampling rate of acceleration data with temporal dependency, we propose a local feature based long short-term memory (LF-LSTM) approach to […]

Related Product: MotionWatch

Publication Date: September 12, 2019


A. Protocol: Using N-of-1 tests to identify responders to melatonin for sleep disturbance in Parkinson’s disease

Background 40% of Parkinson’s Disease (PD) sufferers experience insomnia, impacting health and quality of life for patients and family members, especially carers. There is little evidence that current treatments are effective. Objectives To determine the effectiveness of melatonin in reducing insomnia in 44 individuals with PD using N-of-1 trials. To aggregate group data to arrive […]

Related Product: MotionWatch

Publication Date: September 1, 2019


Validity of actigraphy compared to polysomnography for sleep assessment in children with autism spectrum disorder

Actigraphy (ACT) is a non-invasive objective assessment tool for the study of sleep–wake rhythms. It is of particular interest in children with autism spectrum disorder (ASD), as sleep disorders are highly prevalent and have a significant impact on both cognitive and behavioral functions. As polysomnography (PSG), the gold standard for the assessment of sleep, is […]

Related Product: MotionWatch

Publication Date: August 2, 2019


Prebiotic supplementation does not affect reading and cognitive performance in children: A randomised placebo-controlled study

Based on the emerging interest in the effects of gut microbiota on cognition, this proof-of-concept study assessed how children aged 7 to 9 with low reading scores responded to the ingestion of a 3-month prebiotic supplement versus a placebo. As a secondary aim, the effects of the prebiotic on cognition, sleep, behaviour, mood, anxiety, and […]

Related Product: MotionWatch

Publication Date: July 25, 2019


Neurobiological Basis of Sleep and Wake Dysfunction In AD and Other Tauopathies: The Role of the Neuromodulatory System

Wake, sleep and circadian disturbances are common occurrences in Alzheimer’ disease (AD) and other tauopathies often preceding disease-defining symptoms. Clinical data point to a divergent sleep-wake behavior profiles among tauopathies which probably reflects their differential pattern of neuronal vulnerability and spread and thus, have implications for developing symptomatic and disease-modifying treatments. Although some aspects of […]

Related Product: MotionWatch

Publication Date: July 14, 2019


Actigraphic Screening for Rapid Eye Movement Sleep Behavior Disorder

Background: The patients suffering of the rapid eye movement sleep behavior disorder (RBD) are in high risk of developing a neurodegenerative disorder, most frequently from the group of alpha-synucleinopathies, such as Parkinson’s disease (PD), Dementia with Lewy Bodies (DLB) or multiple system atrophy (MSA). The definitive diagnosis of RBD is based on polysomnographic investigation. Actigraphy […]

Related Product: MotionWatch

Publication Date: July 14, 2019


Sleep Quality and Quantity of International Rugby Sevens Players During Pre-season

The aim of this study was to investigate the influence of training load on objective and subjective sleep measures among elite rugby sevens players during pre-season. Nine international male rugby sevens players participated in this study. Actigraphic and subjective sleep assessment were performed on a daily basis to measure sleep parameters. Training load was measured […]

Related Product: MotionWatch

Publication Date: July 1, 2019


Wrist Actigraphy Analysis From MotionWatch 8 Data

This article expands the presentation made at SENSORDEVICES 2018. The Author makes available to the public one year of wrist actimetry in real life, stored at one second epochs. The technical details of the system used (Motionwatch8) are described and they show why quantitative methodologies applied to actigraphy are tied to the system used for […]

Related Product: MotionWatch

Publication Date: June 30, 2019


Visual imagery and visual perception induce similar changes in occipital slow waves of sleep

Related Product: MotionWatch

Publication Date: June 10, 2019


The effect of sleep deprivation on objective and subjective measures of facial appearance

The faces of people who are sleep deprived are perceived by others as looking paler, less healthy and less attractive compared to when well rested. However, there is little research using objective measures to investigate sleep‐loss‐related changes in facial appearance. We aimed to assess the effects of sleep deprivation on skin colour, eye openness, mouth […]

Related Product: MotionWatch

Publication Date: April 21, 2019


The effects of brief chat-based and face-to-face psychotherapy for insomnia: A randomized waiting list controlled trial

Background Recent studies have directly compared the effects of Internet-based self-help interventions with face-to-face (FtF) treatment, but groups may also differ regarding other aspects, aside from the fact that the former is online and the latter offline. Thus, we examined the effects of a brief three-session psychotherapy for insomnia that was delivered FtF or through […]

Related Product: MotionWatch

Publication Date: April 19, 2019


Time-of-day and days-on-shift predict increased fatigue over two-week offshore day-shifts

Objectives The purpose of this study was to investigate the accumulation of fatigue over a two-week offshore period. In particular, the effects of (1) time-of-day and days-on-shift as well as (2) acute and chronic sleep loss on the rate at which fatigue accumulates were investigated. Methods 42 day-shift offshore workers were examined. Fatigue was measured […]

Related Product: MotionWatch

Publication Date: March 20, 2019


Melatonin, temazepam and placebo in hospitalised older patients with sleeping problems (MATCH): a study protocol of randomised controlled trial

Hospitalised older patients frequently suffer from inadequate sleep, which can lead to patient distress and delayed recovery from acute illness or surgical procedure. Currently, no evidence-based treatments exist for sleeping problems in hospitalised older patients. Benzodiazepines, such as temazepam, are regularly prescribed by physicians, although they have serious side effects; for older patients in particular. […]

Related Product: MotionWatch

Publication Date: March 19, 2019


Sleep deprivation and its effects on communication during individual and collaborative tasks

Sleep loss has been shown to cause impairments in a number of aspects central for successful communication, ranging from poorer linguistic comprehension to alterations in speech prosody. However, the effect of sleep loss on actual communication is unknown. This study investigated how a night of sleep deprivation affected performance during multiple tasks designed to test […]

Related Product: MotionWatch

Publication Date: February 28, 2019


Sleep and cognitive function in chronic stroke: a comparative cross-sectional study

Poor sleep is common following stroke, limits stroke recovery, and can contribute to further cognitive decline post-stroke. However, it is unclear what aspects of sleep are different in older adults with stroke compared with those without, and whether the relationship between sleep and cognitive function differs by stroke history. We investigated whether older adults with […]

Related Product: MotionWatch

Publication Date: February 26, 2019


Brain and cognitive correlates of sleep fragmentation in elderly subjects with and without cognitive deficits

Introduction Sleep disturbances are increasingly recognized as a risk factor for Alzheimer’s disease. However, no study has assessed the relationships between objective sleep fragmentation (SF) and brain and cognitive integrity across different cognitive stages, from cognitively unimpaired elderly subjects to patients with subjective cognitive decline and/or mild cognitive impairment. Methods 30 cognitively unimpaired elderly participants […]

Related Product: MotionWatch

Publication Date: February 8, 2019


DREAMS-START (Dementia RElAted Manual for Sleep; STrAtegies for RelaTives) for people with dementia and sleep disturbances: a single-blind feasibility and acceptability randomized controlled trial.

40% of people with dementia have disturbed sleep but there are currently no known effective treatments. Studies of sleep hygiene and light therapy have not been powered to indicate feasibility and acceptability and have shown 40–50% retention. We tested the feasibility and acceptability of a six-session manualized evidence-based non-pharmacological therapy; Dementia RElAted Manual for Sleep; […]

Related Product: MotionWatch

Publication Date: January 1, 2019


Sleep-Wake and Sleep Stage Detection from Wrist-Worn Actigraphy

Please consult pdf

Related Product: MotionWatch

Publication Date: January 1, 2019


Aircraft noise exposure and objective sleep quality in the population living near airports in France

Background: Aircraft noise has been shown to have adverse effects on health and particularly on sleep. The aim of the study was to investigate the association between aircraft noise exposure and objective sleep quality in the population living near airports in France. Methods: Actimetric measurements were performed during eight nights to evaluate sleep quality of […]

Related Product: MotionWatch

Publication Date: December 18, 2018


Deep clinical and biological phenotyping of the preterm birth and small for gestational age syndromes: The INTERBIO-21 st Newborn Case-Control Study protocol

Background: INTERBIO-21 st is Phase II of the INTERGROWTH-21 st Project, the population-based, research initiative involving nearly 70,000 mothers and babies worldwide coordinated by Oxford University and performed by a multidisciplinary network of more than 400 healthcare professionals and scientists from 35 institutions in 21 countries worldwide. Phase I, conducted 2008-2015, consisted of nine complementary […]

Related Product: MotionWatch

Publication Date: December 10, 2018


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