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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Subjective and objective sleep in young people with borderline personality disorder features
Characterising sleep in young people (aged 15–25 years) with borderline personality disorder (BPD) features is crucial given the association between BPD features and sleep disturbance, negative consequences of poor sleep, and normative developmental sleep changes that occur in this age group. The present study aimed to characterise the sleep profile of young people with BPD […]
Related Product: MotionWatch
Publication Date: August 19, 2021
Intravesical Bacillus Calmette-Guerin treatment-induced sleep quality deterioration in patients with non-muscle invasive bladder cancer: functional outcome assessment based on a questionnaire survey and actigraphy
Purpose We investigated sleep parameters and patient-reported outcomes before, during, and after induction Bacillus Calmette-Guerin therapy using questionnaires and actigraphy in patients with non-muscle invasive bladder cancer. Methods We investigated 10 patients who received Bacillus Calmette-Guerin therapy once weekly for 8 weeks. The International Prostate Symptom Score, European Organization for Research and Treatment of Cancer […]
Related Product: MotionWatch
Publication Date: August 16, 2021
Gender differences in BaYaka forager sleep-wake patterns in forest and village contexts
Sleep studies in small-scale subsistence societies have broadened our understanding of cross-cultural sleep patterns, revealing the flexibility of human sleep. We examined sleep biology among BaYaka foragers from the Republic of Congo who move between environmentally similar but socio-ecologically distinct locations to access seasonal resources. We analyzed the sleep–wake patterns of 51 individuals as they […]
Related Product: MotionWatch
Publication Date: July 1, 2021
Self-Reported and Objective Sleep Measures in Stroke Survivors With Incomplete Motor Recovery at the Chronic Stage
Background. Stroke survivors commonly complain of difficulty sleeping. Poor sleep is associated with reduced quality of life and more understanding of long-term consequences of stroke on sleep is needed. Objective. The primary aims were to (1) compare sleep measures between chronic stroke survivors and healthy controls and (2) test for a relationship between motor impairment, […]
Related Product: MotionWatch
Publication Date: July 1, 2021
Emotion Regulation Failures Are Preceded by Local Increases in Sleep-like Activity
Emotion self-regulation relies both on cognitive and behavioral strategies implemented to modulate the subjective experience and/or the behavioral expression of a given emotion. Although it is known that a network encompassing fronto-cingulate and parietal brain areas is engaged during successful emotion regulation, the functional mechanisms underlying failures in emotion suppression (ES) are still unclear. In […]
Related Product: MotionWatch
Publication Date: June 22, 2021
Validity and reliability of the Suggested Immobilization Test for measurement of restless legs syndrome severity in adults with multiple sclerosis
Objective/Background Adults with multiple sclerosis (MS) often present with conditions that mimic restless legs syndrome (RLS), thereby adding complexity into the assessment of RLS severity. The current gold-standard measures of RLS severity rely on a fixed seven-day time frame, which limits the ability of these measures for studying acute changes in RLS severity. The present […]
Related Product: MotionWatch
Publication Date: June 16, 2021
Individual differences in the temporal relationship between sleep and agitation: a single-subject study in nursing home residents with dementia experiencing sleep disturbance and agitation
Objectives Previous studies on the interrelationship between sleep and agitation relied on group-aggregates and so results may not be applicable to individuals. This proof-of-concept study presents the single-subject study design with time series analysis as a method to evaluate the association between sleep and agitation in individual nursing home residents using actigraphy. Method To record […]
Related Product: MotionWatch
Publication Date: June 15, 2021
The CHD8/CHD7/Kismet family links blood-brain barrier glia and serotonin to ASD-associated sleep defects
Sleep disturbances in autism and neurodevelopmental disorders are common and adversely affect patient’s quality of life, yet the underlying mechanisms are understudied. We found that individuals with mutations in CHD8, among the highest-confidence autism risk genes, or CHD7 suffer from disturbed sleep maintenance. These defects are recapitulated in Drosophila mutants affecting kismet, the sole CHD8/CHD7 […]
Related Product: MotionWatch
Publication Date: June 4, 2021
Sleepiness is a signal to go to bed: data and model simulations
Study Objectives Assess the validity of a subjective measure of sleepiness as an indicator of sleep drive by quantifying associations between intraindividual variation in evening sleepiness and bedtime, sleep duration, and next morning and subsequent evening sleepiness, in young adults. Methods Sleep timing and sleepiness were assessed in 19 students in late autumn and late […]
Related Product: MotionWatch
Publication Date: May 15, 2021
Effects of Saffron Extract on Sleep Quality: A Randomized Double-Blind Controlled Clinical Trial
A saffron extract has been found to be effective in the context of depression and anxiety, but its effect on sleep quality has not been investigating yet using objective approaches. For this purpose, a randomized double-blind controlled study was conducted in subjects presenting mild to moderate sleep disorder associated with anxiety. Sixty-six subjects were randomized […]
Related Product: MotionWatch
Publication Date: April 27, 2021
Protocol for Light-Dark and Activity Rhythm Therapy for sleep: Feasibility and acceptability in Schizophrenia spectrum disorders (L-DART FitSz)
Sleep problems are common in people with diagnoses of schizophrenia spectrum disorders (> 50%), even during periods of relative stability of psychotic symptoms. Evidence suggests that people living with schizophrenia spectrum disorders are often keen to improve their sleep, but few non-pharmacological sleep treatments are available to patients in specialist mental health services. It has been […]
Related Product: MotionWatch
Publication Date: April 19, 2021
Association of Sleep Quality With Greater Left Ventricular Mass in Children Aged 9 to 11 Years
Objective Research has consistently found associations between sleep characteristics and cardiovascular disease risk in children, adolescents, and adults. Although primarily investigated in clinical samples (e.g., in those with sleep disorders), greater left ventricular mass is associated with poor sleep quality in nonclinical adult populations as well; however, this has not been evaluated in children or […]
Related Product: MotionWatch
Publication Date: April 1, 2021
Effect of the depth of cold water immersion on sleep architecture and recovery among well-trained male endurance runners.
Introduction: The aim of the present study was to investigate the effect of the depth of cold water immersion (CWI) (whole-body with head immersed and partial-body CWI) after high-intensity, intermittent running exercise on sleep architecture and recovery kinetics among well-trained runners. Methods: In a randomized, counterbalanced order, 12 well-trained male endurance runners (V.O2max = 66.0 […]
Related Product: MotionWatch
Publication Date: March 31, 2021
Brain reactivity to humorous films is affected by insomnia
Study objectives Emotional reactivity to negative stimuli has been investigated in insomnia, but little is known about emotional reactivity to positive stimuli and its neural representation. Methods We used 3T fMRI to determine neural reactivity during the presentation of standardized short, 10-40-s, humorous films in insomnia patients (n=20, 18 females, aged 27.7 +/- 8.6 years) […]
Related Product: MotionWatch
Publication Date: March 27, 2021
Lights Out: Examining Sleep in Children with Vision Impairment
Sleep is crucial for development across cognitive, physical, and social-emotional domains. Sleep quality and quantity impact domains of daytime functioning, attainment, and global development. Previous work has explored sleep profiles in typically developing children and children with developmental disorders such as Down syndrome and Williams Syndrome, yet there is a complete absence of published work […]
Related Product: MotionWatch
Publication Date: March 26, 2021
Efficacy of triprolidine in the treatment of temporary sleep disturbance
Triprolidine, a first-generation antihistamine for allergic rhinitis, has a shorter half-life and fewer persistent effects relative to other antihistamines and may be useful in the treatment of temporary sleep disturbance. Patients aged ≥18 years old were randomized 1:1:1 to receive either triprolidine 2.5 mg (n = 65), triprolidine 5 mg (n = 66), or placebo […]
Related Product: MotionWatch
Publication Date: March 25, 2021
Effect of COVID-19 home confinement on sleep monitorization and cardiac autonomic function in people with multiple sclerosis: A prospective cohort study
Background Low sleep quality, cardiac autonomic dysfunction and poor quality of life are some of the most prevalent symptoms in people with Multiple Sclerosis (MS). In addition to the progression of the disease, these symptoms are aggravated by physical inactivity. Therefore, home confinement due to COVID-19 pandemic restrictions could further worsen these symptoms. This study […]
Related Product: MotionWatch
Publication Date: March 19, 2021
Reshaping the path of vascular cognitive impairment with resistance training: a study protocol for a randomized controlled trial
Background Subcortical ischemic vascular cognitive impairment (SIVCI) is the most common form of vascular cognitive impairment. Importantly, SIVCI is considered the most treatable form of cognitive impairment in older adults, due to its modifiable risk factors such as hypertension, diabetes mellitus, and hypercholesterolemia. Exercise training is a promising intervention to delay the progression of SIVCI, […]
Related Product: MotionWatch
Publication Date: March 18, 2021
Sleep characteristics of highly trained wheelchair rugby athletes with and without a cervical spinal cord injury during the competitive season
Sleep behaviours although significantly relevant to exercise recovery are poorly characterised in Para-sport athletes. Therefore, the main aims were to describe sleep quality and quantity of highly trained wheelchair rugby (WR) athletes during the competitive season, and to investigate whether impairment type or attending a training camp influenced sleep outcomes. Eighteen male WR athletes (mean […]
Related Product: MotionWatch
Publication Date: March 17, 2021
Understanding fatigue in a naval submarine: Applying biomathematical models and workload measurement in an intensive longitudinal design
Fatigue is a critically important aspect of crew endurance in submarine operations, with continuously high fatigue being associated with increased risk of human error and long-term negative health ramifications. Submarines pose several unique challenges to fatigue mitigation, including requirements for continuous manning for long durations, a lack of access to critical environmental zeitgebers (stimuli pertinent […]
Related Product: MotionWatch
Publication Date: March 16, 2021
Alterations of the cardiovascular rhythms and sleep quality in esophageal cancer patients
In humans, there is a daily rhythm in blood pressure and is one of the known risk factors for different types of cardiovascular diseases. Sleep quality is an important clinical construct. Daytime sleepiness is common sleep related clinical problem, suggesting a serious underlying physiological anomaly. Most of the studies have been done in reference to […]
Related Product: MotionWatch
Publication Date: March 16, 2021
Temporal dynamics of depression, cognitive performance and sleep in older persons with depressive symptoms and cognitive impairments: a series of eight single-subject studies
Objectives: To investigate the presence, nature and direction of the daily temporal association between depressive symptoms, cognitive performance and sleep in older individuals. Design, setting, participants: Single-subject study design in eight older adults with cognitive impairments and depressive symptoms. Measurements: For 63 consecutive days, depressive symptoms, working memory performance and night-time sleep duration were daily […]
Related Product: MotionWatch
Publication Date: March 15, 2021
Accuracy of Actigraphy Compared to Concomitant Ambulatory Polysomnography in Narcolepsy and Other Sleep Disorders
Actigraphy provides longitudinal sleep data over multiple nights. It is a less expensive and less cumbersome method for measuring sleep than polysomnography. Studies assessing accuracy of actigraphy compared to ambulatory polysomnography in different sleep-disordered patients are rare. We aimed to compare the concordance between these methods in clinical setting. We included 290 clinical measurements of […]
Related Product: MotionWatch
Publication Date: March 4, 2021
A Sleep Analysis of Elite Female Soccer Players During a Competition Week
Purpose: (1) To compare the sleep of female players from a professional soccer team to nonathlete controls across an in-season week and (2) to compare the sleep of core and fringe players from the same team on the night after a match to training nights. Methods: Using an observational design, 18 professional female soccer players […]
Related Product: MotionWatch
Publication Date: March 3, 2021
The self-reported causes of sleepiness in shift-working tram and truck drivers
Identifying the causes of sleepiness in various safety-critical work environments is necessary for implementing more efficient fatigue management strategies. In transportation, little is known about drivers’ own perceptions of these causes. Therefore, we instructed shift-working tram (n = 23) and long-haul truck drivers (n = 52) to report at the end of their shifts what […]
Related Product: MotionWatch
Publication Date: March 2, 2021
Effects of resistance training intensity on sleep quality and strength recovery in trained men: a randomized cross-over study
Resistance training (RT) variables can affect sleep quality, strength recovery and performance. The aim of this study was to examine the acute effect of RT leading to failure vs. non-failure on sleep quality (SQ), heart rate variability (HRV) overnight and one-repetition maximum (1-RM) performance 24 hours after training. Fifteen resistance-trained male athletes (age: 23.4 ± […]
Related Product: MotionWatch
Publication Date: March 1, 2021
How do the officials sleep? The assessment of sleep of the public administration workers using objective and subjective methods
Sleep impacts our functioning, both on a physical and mental level. This study aimed to assess the officials’ sleep using objective (actigraphic examination) and subjective evalutation methods (self-administered questionnaire and sleep diary). The analysis revealed that among the officials, sleep deprivation was common. The average actual sleep time in this group was 1-hour shorter than […]
Related Product: MotionWatch
Publication Date: March 1, 2021
The impact of daily caffeine intake on nighttime sleep in young adult men
Acute caffeine intake can delay sleep initiation and reduce sleep intensity, particularly when consumed in the evening. However, it is not clear whether these sleep disturbances disappear when caffeine is continuously consumed during daytime, which is common for most coffee drinkers. To address this question, we investigated the sleep of twenty male young habitual caffeine […]
Related Product: MotionWatch
Publication Date: February 25, 2021
The Relationships Between Training Load, Type of Sport, and Sleep Among High-Level Adolescent Athletes
Purpose: To evaluate the effects of sporting activities, training loads, and athletes’ characteristics on sleep among high-level adolescent athletes, in a controlled training and academic environment. Methods: A total of 128 high-level adolescent athletes (age = 15.2 [2.0] y), across 9 different sports, completed common sleep questionnaires and were monitored daily (7.3 [2.7] d) during a typical […]
Related Product: MotionWatch
Publication Date: February 25, 2021
The Effects of Genetic Background for Diurnal Preference on Sleep Development in Early Childhood
Purpose No previous research has examined the impact of the genetic background of diurnal preference on children´s sleep. Here, we examined the effects of genetic risk score for the liability of diurnal preference on sleep development in early childhood in two population-based cohorts from Finland. Participants and Methods The primary sample (CHILD-SLEEP, CS) comprised 1420 […]
Related Product: MotionWatch
Publication Date: February 16, 2021
Periodic Leg Movements’ Diagnosis in Spinal Cord Injury: Actigraphy as an Alternative for Polysomnography?
Periodic Limb Movements during Sleep (PLMs) are episodes of repetitive, stereotypical, hallux or foot movements. They could induce sleep disturbance, fatigue, daytime sleepiness and impaired quality of life but also increased cardiovascular risk by rising heart rate and blood pressure at night. Gold standard for PLMs diagnosis is based on electromyographic recording of tibialis anterior […]
Related Product: MotionWatch
Publication Date: February 11, 2021
The travel demands of an elite rugby sevens team: Effects on objective and subjective sleep parameters
Purpose: To explore the effects of travel related to international rugby sevens competition on sleep patterns. Methods: A total of 17 international male rugby sevens players participated in this study. Actigraphic and subjective sleep assessments were performed daily during 2 separate Sevens World Series competition legs (Oceania and America). The duration of each competition leg […]
Related Product: MotionWatch
Publication Date: February 4, 2021
DPSleep: Open-Source Longitudinal Sleep Analysis From Accelerometer Data
Wearable devices are now widely available to collect continuous objective behavioral data from individuals and to measure sleep. Here we introduce a pipeline to infer sleep onset, duration, and quality from raw accelerometer data and then quantify relationships between derived sleep metrics and other variables of interest. The pipeline released here for the deep phenotyping […]
Related Product: MotionWatch
Publication Date: February 4, 2021
The complexity of sleep disorders in dialysis patients
Background Dialysis patients experience a high burden of physical and emotional symptoms directly affecting their sleep and quality of life. In this study, objective and subjective measurements to quantify sleep were performed, compared with those of healthy controls, and associated with burden of comorbidity and uraemic toxicity. Methods A total of 64 dialysis patients were […]
Related Product: MotionWatch
Publication Date: January 19, 2021
Excessive sleepiness in patients with psychosis: An initial investigation
Clinical experience indicates that excessive sleepiness and hypersomnia may be a common issue for patients with psychosis. Excessive sleepiness is typically ascribed to the sedating effects of antipsychotic medications but there may be other potential contributors such as sleep disorders and depression. Furthermore, the impact of excessive sleepiness itself on patients’ symptoms and general wellbeing […]
Related Product: MotionWatch
Publication Date: January 15, 2021
Sleep, Prospective Memory, and Immune Status among People Living with HIV
Background: Persons living with HIV (PLWH) frequently report sleep complaints, but objective measurements are still lacking regarding sleep continuity, total sleep time per 24 h, and the links with both prospective memory performance and HIV infection parameters. Methods: PLWH (n = 96) and control (n = 96) groups (balanced for gender and age) were monitored […]
Related Product: MotionWatch
Publication Date: January 8, 2021
Alzheimer’s disease genetic risk and sleep phenotypes in healthy young men: association with more slow waves and daytime sleepiness
Study Objectives Sleep disturbances and genetic variants have been identified as risk factors for Alzheimer’s disease (AD). Our goal was to assess whether genome-wide polygenic risk scores (PRS) for AD associate with sleep phenotypes in young adults, decades before typical AD symptom onset. Methods We computed whole-genome PRS for AD and extensively phenotyped sleep under […]
Related Product: MotionWatch
Publication Date: January 1, 2021
Sleep and Activity Patterns Are Altered During Early Critical Illness in Mechanically Ventilated Adults
Background Mechanically ventilated (MV) patients in the intensive care unit (ICU) often experience disturbed sleep and profound inactivity. Objectives The aim of this study was to report 5 consecutive days’ descriptive analyses on sleep efficiency (SE), total sleep time (TST), daytime activity ratio (DAR), and hourly activity counts among critically ill MV adults from 9 […]
Related Product: MotionWatch
Publication Date: January 1, 2021
pyActigraphy: open-source python package for actigraphy data visualisation and analysis
Over the past 40 years, actigraphy has been used to study rest-activity patterns in circadian rhythm and sleep research. Furthermore, considering its simplicity of use, there is a growing interest in the analysis of large population-based samples, using actigraphy. Here, we introduce pyActigraphy, a comprehensive toolbox for data visualization and analysis including multiple sleep detection […]
Related Product: MotionWatch
Publication Date: December 3, 2020
Taking the sleep lab to the field: Biometric techniques for quantifying sleep and circadian rhythms in humans
Objectives Remarkably, the specifics of sleep along the human lineage have been slow to emerge, which is surprising given our distinct mental and behavioral capacity and the importance of sleep for individual health and cognitive performance. Largely due to difficultly of measuring sleep outside a controlled, clinical, and laboratory study in ambulatory individuals, human biologists […]
Related Product: MotionWatch
Publication Date: November 30, 2020
Cross-participant prediction of vigilance stages through the combined use of wPLI and wSMI EEG functional connectivity metrics
Functional connectivity (FC) metrics describe brain inter-regional interactions and may complement information provided by common power-based analyses. Here we investigated whether the FC-metrics weighted Phase Lag Index (wPLI) and weighted Symbolic Mutual Information (wSMI) may unveil functional differences across four stages of vigilance – wakefulness (W), NREM-N2, NREM-N3 and REM sleep – with respect to […]
Related Product: MotionWatch
Publication Date: November 21, 2020
Sleep and Cognition in Children with Fetal Alcohol Spectrum Disorders (FASD) and Children with Autism Spectrum Disorders (ASD)
Children with Fetal Alcohol Spectrum Disorders (FASD) and Autism Spectrum Disorders (ASD) experience significantly higher rates of sleep disturbances than their typically developing peers. However, little is known about the association between sleep and the cognitive phenotype in these clinical populations. Structural damage affecting cortical and subcortical connectivity occurs as a result of prenatal alcohol […]
Related Product: MotionWatch
Publication Date: November 16, 2020
Objective sleep patterns and validity of self-reported sleep monitoring across different playing levels in rugby union
BACKGROUND: Growing evidence highlights that elite rugby union players experience poor sleep quality and quantity which can be detrimental for performance OBJECTIVES: This study aimed to i) compare objective sleep measures of rugby union players between age categories over a one week period, and ii) compare self-reported measures of sleep to wristwatch actigraphy as the […]
Related Product: MotionWatch
Publication Date: October 1, 2020
Use of actigraphy and sleep diaries to assess sleep and academic performance in pharmacy students
Introduction Sleep parameters have been shown to correlate with academic performance. Current studies assessing sleep in doctor of pharmacy (PharmD) students rely on self-reported sleep parameters and academic performance. The objectives of this study were to describe and compare sleep parameters in pharmacy students using actigraphy and sleep diaries and to assess the correlation of […]
Related Product: MotionWatch
Publication Date: August 30, 2020
An Automatic Estimation of the Rest-Interval for MotionWatch8© Using Uniaxial Movement and Lux Data
Poor sleep is linked with chronic conditions common in older adults, including diabetes, heart disease, and dementia. Valid and reliable field methods to objectively measure sleep are thus greatly needed to examine how poor sleep impacts older adults. Wrist-worn actigraphy (WWA) is a common objective measure of sleep that uses motion and illuminance data to […]
Related Product: MotionWatch
Publication Date: August 24, 2020
Binocular Vision, Visual Function, and Pupil Dynamics in People Living With Dementia and Their Relation to the Rate of Cognitive Decline and Structural Changes Within the Brain: Protocol for an Observational Study
Background: Visual impairment is a common comorbidity in people living with dementia. Addressing sources of visual difficulties can have a significant impact on the quality of life for people living with dementia and their caregivers. Depth perception problems are purportedly common in dementia and also contribute to falls, visuomotor task difficulties, and poorer psychosocial well-being. […]
Related Product: MotionWatch
Publication Date: August 10, 2020
Local increases in sleep-like activity predict the occurrence of emotion suppression failures
Emotion self-regulation relies both on cognitive and behavioral strategies implemented to modulate the subjective experience and/or the behavioral expression of a given emotion. While it is known that a network encompassing fronto-cingulate and parietal brain areas is engaged during successful emotion regulation, the functional mechanisms underlying failures in emotion suppression are still unclear. In order […]
Related Product: MotionWatch
Publication Date: August 5, 2020
Reduced Neuromuscular Performance in Night Shift Orthopedic Nurses: New Insights From a Combined Electromyographic and Force Signals Approach
The effect of sleep–wake rhythm disruption on neuromuscular control and muscle fatigue has received little attention. Because nurse shift work is so varied, including overnight duty, rotating shift schedules, early awakening, and interrupted nocturnal sleep, it offers an interesting model to study this paradigm. It has been investigated so far using only subjective markers. A […]
Related Product: MotionWatch
Publication Date: June 30, 2020
The clinical relevance of early identification and treatment of sleep disorders in mental health care: protocol of a randomized control trial
Background Sleep disorders are a risk factor for developing a variety of mental disorders, have a negative impact on their remission rates and increase the risk of relapse. Early identification and treatment of sleep disorders is therefore of paramount importance. Unfortunately, in mental health care sleep disorders are often poorly recognized and specific treatment frequently […]
Related Product: MotionWatch
Publication Date: June 24, 2020
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
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