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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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
Circadian rhythm and quality of life in older adults
Sleep is critical to physical and mental health for people of all ages, but older adults are particularly vulnerable to the consequences of poor sleep health. The purpose of this pilot study was to explore patterns of sleep and the relationships between circadian rhythm disorders and quantity of life in 34 community-dwelling older adults. Participants […]
Related Product: MotionWatch
Publication Date: June 17, 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
Time-of-day effects on objective and subjective short-term memory task performance
The time-of-day along with the synchrony effect (better performance at optimal times of the day according to the chronotype) on the cognitive performance has been well established in previous research. This influence is mediated by both circadian and homeostatic processes consistent with the Borbély two-process model. This experiment focused on the objective and subjective performance […]
Related Product: MotionWatch
Publication Date: June 14, 2021
Efficacy of early warning signals and spectral periodicity for predicting transitions in bipolar patients: An actigraphy study
Early-warning signals (EWS) have been successfully employed to predict transitions in research fields such as biology, ecology, and psychiatry. The predictive properties of EWS might aid in foreseeing transitions in mood episodes (i.e. recurrent episodes of mania and depression) in bipolar disorder (BD) patients. We analyzed actigraphy data assessed during normal daily life to investigate […]
Related Product: MotionWatch
Publication Date: June 7, 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
MotionWatch 8 Wrist Actimetry Data Analysis: from ambulatory recording to real life monitoring
On the National Sleep Research Resource (NSRR) platform, there’s a year’s worth in real-life wrist actigraphy data using a Motionwatch8. The data analysis suggested in this paper reveals a data structure that allows the design of parameters to be used in real life monitoring and may drive the developments of devices. The analysis is totally […]
Related Product: MotionWatch
Publication Date: May 13, 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
The courses of objective physical activity and the association with sleepiness during a 2-week-on/2-week-off offshore shift rotation: an observational repeated-measures study
Background Offshore workers are assumed to have poor health behaviours, but no studies have yet examined physical activity (PA) during a full offshore shift rotation period, including both work and at home periods. Furthermore, the relationship of PA with sleepiness, a prevalent safety hazard offshore, is not known. This study aimed to examine (1) the […]
Related Product: MotionWatch
Publication Date: April 17, 2021
Different Circadian Rest-Active Rhythms in Kleine-Levin Syndrome: A prospective and case-control study
Study objectives Kleine-Levin-syndrome (KLS) is a rare recurrent hypersomnia. Our study aimed at monitoring the movements of patients with KLS using actigraphy and evaluating their circadian rhythm. Methods Twenty young patients with KLS and 14 age-matched controls were recruited. Each individual wore an actigraphy for more than 6 months to monitor at least two attacks. […]
Related Product: MotionWatch
Publication Date: April 14, 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
Sleep deprivation therapy to reset the circadian pacemaker in a non-24-hour sleep-wake disorder: a case report
Non-24-hour sleep-wake disorder (N24SWD) is one of several chronic circadian rhythm sleep-wake disorders (CRSWDs). It is defined as progressive daily shifts in sleep onset and wake times. It mainly affects sight-impaired persons, is relatively rare in sighted patients, and is difficult to treat, with no guidelines. We report a case of N24SWD in a sighted […]
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
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
Quantifying Circadian Aspects of Mobility-Related Behavior in Older Adults by Body-Worn Sensors—An “Active Period Analysis”
Disruptions of circadian motor behavior cause a significant burden for older adults as well as their caregivers and often lead to institutionalization. This cross-sectional study investigates the association between mobility-related behavior and subjectively rated circadian chronotypes in healthy older adults. The physical activity of 81 community-dwelling older adults was measured over seven consecutive days and […]
Related Product: MotionWatch
Publication Date: March 18, 2021
Sex Differences in Rest-Activity Circadian Rhythm in Patients With Metabolic Syndrome
Rest-Activity circadian Rhythm (RAR) can be used as a marker of the circadian timing system. Recent studies investigated the relationship between irregular circadian rhythms and cardiovascular risk factors such as hypertension, obesity, and dyslipidemia. These factors are related to the Metabolic Syndrome (MS), a clustering of metabolic risk factors that increases the risk of several […]
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
Physical activity is associated with lower pulsatile stress but not carotid stiffness in children
The cardiovascular disease (CVD) process may begin early in life when accompanied by atherosclerotic risk factors. CVD risk factors in children are associated with stiffening of the large elastic arteries, a reflection of subclinical atherosclerosis. Physical activity is a preventative lifestyle strategy that may benefit arterial stiffness by attenuating the hemodynamic stress on the artery […]
Related Product: MotionWatch
Publication Date: March 12, 2021
Personalized ESM monitoring and feedback to support psychological treatment for depression: a pragmatic randomized controlled trial (Therap-i)
Background Major depressive disorder (MDD) is a highly prevalent mental disorder with large disease burden, high levels of relapse or persistence, and overall suboptimal outcomes of protocolized pharmacological and psychotherapeutic treatments. There is an urgent need to improve treatment effectiveness, possibly through systematic treatment personalization. In psychotherapeutic treatments this can be achieved by case conceptualization. […]
Related Product: MotionWatch
Publication Date: March 10, 2021
Longitudinal observational study to prevent fractures in older individuals with musculoskeletal ambulatory disability symptom complex: the first-year data and effects in the COVID-19 pandemic
We evaluated physical function, physical activity, and sleep status in five elderly individuals with musculoskeletal ambulatory disability symptom complex (MADS) for one year, and examined their influential factors associated with sarcopenia. Compared with the baseline, the results did not show significant differences in every item. Notably, the COVID-19 pandemic had occurred throughout Japan for nearly […]
Related Product: MotionWatch
Publication Date: March 9, 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
Differences in Daytime Activity Levels and Daytime Sleep Between Night and Day Duty: An Observational Study in Italian Orthopedic Nurses
Working nonstandard work schedules is often associated with increased sedentary behavior and risk of sleep disorders. Night shift workers are prone to accumulating sleep debt, which they recover by sleeping during the day. The effect on daytime activity levels is unknown. The present study aims to objectively assess whether daytime sleep could affect daytime activity […]
Related Product: MotionWatch
Publication Date: February 26, 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
Weekly, seasonal and chronotype‐dependent variation of Dim‐Light Melatonin Onset
In humans, the most important zeitgeber for entrainment is light. Laboratory studies have shown that meaningful changes in light exposure lead to phase shifts in markers of the circadian clock. In natural settings, light is a complex signal varying with external conditions and individual behaviors; nonetheless, phase of entrainment is assumed to be fairly stable. […]
Related Product: MotionWatch
Publication Date: February 20, 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
Can actigraphy be used to define lithium response dimensions in bipolar disorders?
Background: Actigraphy is commonly used in case-control studies to explore sleep-wake patterns and circadian rhythmicity in bipolar disorders (BD). However, there is limited ecological research regarding actigraphy parameters associated with response to lithium (Li_Resp). Methods: Outpatients with BD-I (n=70) and BD-II (n=20) who were all prescribed prophylactic Li undertook 21 consecutive days of actigraphy recording. […]
Related Product: MotionWatch
Publication Date: February 2, 2021
Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness
Smartphone usage strongly increased in the last decade, especially before bedtime. There is growing evidence that short-wavelength light affects hormonal secretion, thermoregulation, sleep and alertness. Whether blue light filters can attenuate these negative effects is still not clear. Therefore, here, we present preliminary data of 14 male participants (21.93 ± 2.17 years), who spent three […]
Related Product: MotionWatch
Publication Date: January 22, 2021
A brief report of sleep and circadian rhythm quotas in a population of dog owners in North Carolina USA
Objectives To characterize sleep and circadian rhythms of a sample population of healthy, dog-owning adults from North Carolina, USA. Methods Actigraphy was used to analyze sleep-wake patterns in forty-two dog owners from the Raleigh area in North Carolina. Sleep quotas, including sleep duration, efficiency, and fragmentation were measured alongside a Non-parametric Circadian Rhythms Analysis (NPCRA) […]
Related Product: MotionWatch
Publication Date: January 22, 2021
Sleep, Circadian Rhythmicity and Response to Chronotherapy in University Students: Tips from Chronobiology Practicals
Chronobiology is not routinely taught to biology or medical students in most European countries. Here we present the results of the chronobiology practicals of a group of students of the University of Padova, with a view to highlight some interesting features of this group, and to share a potentially interesting cross-faculty teaching experience. Thirty-eight students […]
Related Product: PRO-Diary
Publication Date: January 21, 2021
Shining the Light on the MotionWatch8 Light Sensor for Sleep and Aging Research: What Can We Measure and What Are We Missing?
Background: Poor sleep is common among older adults at risk for dementia and may be due to circadian dysregulation. Light is the most important external stimulus to the circadian clock and bright light therapy (BLT) has been used for >20 years to help realign circadian rhythms. However, the ability of field methods (e.g., actigraphy) to […]
Related Product: MotionWatch
Publication Date: January 20, 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
Circadian Patterns of Patients with Type 2 Diabetes and Obstructive Sleep Apnea
Sleep apnea, a condition that modifies sleep and circadian rhythms, is highly prevalent in patients with diabetes. However, it is not known if there is an association between sleep apnea, circadian alterations and glycemic regulation in this type of patient. Here, a polysomnographic study was carried out on 21 women and 25 men (mean age […]
Related Product: MotionWatch
Publication Date: January 11, 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
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
Feasibility, Reliability, and Validity of the MotionWatch 8 to Evaluate Physical Activity Among Older Adults With and Without Cognitive Impairment in Assisted Living Settings
This study tested the feasibility, reliability, and validity of the MotionWatch 8 among assisted living residents with and without cognitive impairment. Data from the Dissemination and Implementation of Function Focused Care in Assisted Living Using the Evidence Integration Triangle study were used. The sample included 781 individuals from 85 facilities with a mean age of […]
Related Product: MotionWatch
Publication Date: December 25, 2020
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
Enhancing daily light exposure increases the antibody response to influenza vaccination in patients with dementia
Enhancing lighting conditions in institutions for individuals with dementia improves their sleep, circadian rhythms and well-being. Here, we tested whether a greater long-term daily light exposure supports the immune response to the annual influenza vaccination. Eighty older institutionalised patients suffering from dementia (54 women and 26 men) continuously wore an activity tracker for 8 weeks […]
Related Product: MotionWatch
Publication Date: December 2, 2020
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