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 146 Results

Sleep assessment in patients with Cluster headache – self reported vs observed data

Objective: Cluster Headache (CH) is a primary headache disorder often characterized by a circadian timing of headache attacks. The hypothalamus is reported to be activated during attacks, and several genes involved in the regulation of the molecular clock have been linked to CH. To investigate this further, we analyzed sleep patterns in CH patients compared […]

Related Product: MotionWatch

Publication Date: September 8, 2021


Sleep extension and metabolic health in male overweight/obese short sleepers: A randomised controlled trial

While limited evidence suggests that longer sleep durations can improve metabolic health in habitual short sleepers, there is no consensus on how sustained sleep extension can be achieved. A total of 18 men (mean [SD] age 41 [ 9] years), who were overweight/obese (mean [SD] body mass index 30 [3] kg/m2) and short sleepers at […]

Related Product: MotionWatch

Publication Date: August 20, 2021


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


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


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


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 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


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


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


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