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 72 Results

Does the moon influence sleep in small-scale societies?

Objectives The lunar cycle is expected to influence sleep-wake patterns in human populations that have greater exposure to the environment, as might be found in forager populations that experience few environmental buffers. We investigated this “moonlight” hypothesis in two African populations: one composed of hunter-gatherers (with minimal environmental buffering) and the other rural agriculturalists (with […]

Related Product: MotionWatch

Publication Date: October 4, 2018

Sleep and neurobehavioral performance vary by work start time during non-traditional day shifts

Introduction It is established that shiftwork causes sleep loss and circadian misalignment. Individuals who work non-traditional day shifts that encroach into typical sleep times, such as those in the service and transportation sectors, may also experience sleep and circadian disruption. We aimed to determine how neurobehavioral performance and sleep would be affected by work start […]

Related Product: MotionWatch

Publication Date: October 1, 2018

Daytime sleepiness, salivary cortisol and melatonin levels during four-week blue light blockade. Do we adapt?

Blue light (BL, short wavelength, ca. 480 nm) is known to influence circadian rhythm system, alertness, cognitive and affective functioning of humans (see e.g. Fisk et al., 2018). In this experiment we limited the BL exposure to approximately 10%, by providing the participants with amber contact lenses – to be used continuously during four weeks. […]

Related Product: MotionWatch

Publication Date: September 25, 2018

Buying time: a proof-of-concept randomized controlled trial to improve sleep quality and cognitive function among older adults with mild cognitive impairment

Current evidence suggests that good quality sleep is associated with preserved cognitive function and reduced dementia risk in older adults. Sleep complaints are especially common among older adults with mild cognitive impairment (MCI), and this may contribute to their increased risk for progression to dementia. Thus, improving their sleep may be important for maintaining their […]

Related Product: MotionWatch

Publication Date: August 17, 2018

High-accuracy determination of internal circadian time from a single blood sample

BACKGROUND. The circadian clock is a fundamental and pervasive biological program that coordinates 24-hour rhythms in physiology, metabolism, and behavior, and it is essential to health. Whereas therapy adapted to time of day is increasingly reported to be highly successful, it needs to be personalized, since internal circadian time is different for each individual. In […]

Related Product: MotionWatch

Publication Date: June 28, 2018

Actimetric Day/Night Index as a Predictor of Treatment Response in Depression

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Related Product: MotionWatch

Publication Date: June 1, 2018

Examining courses of sleep quality and sleepiness in full 2 weeks on/2 weeks off offshore day shift rotations

To better understand sleep quality and sleepiness problems offshore, we examined courses of sleep quality and sleepiness in full 2-weeks on/2-weeks off offshore day shift rotations by comparing pre-offshore (1 week), offshore (2 weeks) and post-offshore (1 week) work periods. A longitudinal observational study was conducted among N=42 offshore workers. Sleep quality was measured subjectively […]

Related Product: MotionWatch

Publication Date: May 16, 2018

Investigating daily fatigue scores during two-week offshore day shifts

Objectives This study examined daily scores of fatigue and circadian rhythm markers over two-week offshore day shift periods. Methods A prospective cohort study among N = 60 offshore day-shift workers working two-week offshore shifts was conducted. Offshore day shifts lasted from 07:00 – 19:00 h. Fatigue was measured objectively with pre- and post-shift scores of […]

Related Product: MotionWatch

Publication Date: April 27, 2018

Can short-wavelength depleted bright light during single simulated night shifts prevent circadian phase shifts?

In single night shifts, extending habitual wake episodes leads to sleep deprivation induced decrements of performance during the shift and re-adaptation effects the next day. We investigated whether short-wavelength depleted (=filtered) bright light (FBL) during a simulated night shift would counteract such effects. Twenty-four participants underwent a simulated night shift in dim light (DL) and […]

Related Product: MotionWatch

Publication Date: May 1, 2017

Daily light exposure patterns reveal phase and period of the human circadian clock

Light is the most potent time cue that synchronizes (entrains) the circadian pacemaker to the 24-h solar cycle. This entrainment process is an interplay between an individual’s daily light perception and intrinsic pacemaker period under free-running conditions. Establishing individual estimates of circadian phase and period can be time-consuming. We show that circadian phase can be […]

Related Product: MotionWatch

Publication Date: April 28, 2017

Mechanisms of Non-photic Entrainment

This chapter reviews how non-photic cues like temperature, food, anxiety and induced activity lead to circadian rhythm entrainment in mammals. Generally speaking, when dealing with entrainment by different photic and non-photic zeitgebers, we are only able to show that a certain type of stimulus can or cannot entrain the circadian system, therefore, the comparison is […]

Related Product: MotionWatch

Publication Date: February 16, 2017

Segmented sleep in a nonelectric, small‐scale agricultural society in Madagascar

Objectives We studied sleep in a rural population in Madagascar to (i) characterize sleep in an equatorial small-scale agricultural population without electricity, (ii) assess whether sleep is linked to noise levels in a dense population, and (iii) examine the effects of experimentally introduced artificial light on sleep timing. Methods Using actigraphy, sleep–wake patterns were analyzed […]

Related Product: MotionWatch

Publication Date: February 9, 2017

Activity/rest cycle and disturbances of structural backbone of cerebral networks in aging

Objective Although aging is associated with alterations of both activity/rest cycle and brain structure, few studies have evaluated associations between these processes. The aim of this study was to examine relationship between activity/rest cycle quality and brain structural integrity in aging subjects by exploring both grey and white matter compartments. Material and methods Fifty-eight elderly […]

Related Product: MotionWatch

Publication Date: February 1, 2017

Hadza sleep biology: Evidence for flexible sleep‐wake patterns in hunter‐gatherers.

Objectives Cross-cultural sleep research is critical to deciphering whether modern sleep expression is the product of recent selective pressures, or an example of evolutionary mismatch to ancestral sleep ecology. We worked with the Hadza, an equatorial, hunter-gatherer community in Tanzania, to better understand ancestral sleep patterns and to test hypotheses related to sleep segmentation. Methods […]

Related Product: MotionWatch

Publication Date: January 7, 2017

Scheduled evening sleep and enhanced lighting improve adaptation to night shift work in older adults

Objectives We tested whether a sleep and circadian-based treatment shown to improve circadian adaptation to night shifts and attenuate negative effects on alertness, performance and sleep in young adults would also be effective in older adults. Methods We assessed subjective alertness, sustained attention (psychomotor vigilance task, PVT), sleep duration (actigraphy) and circadian timing (salivary dim-light […]

Related Product: MotionWatch

Publication Date: November 16, 2016

Validation of the Munich ChronoType Questionnaire against actigraphy

Munich ChronoType Questionnaire (MCTQ) is a relatively new self-report instrument to measure chronotype and social jetlag. Despite its increasing use in research, validation studies against objectively measured circadian rhythm are scarce. This study aimed to analyze associations of the MCTQ parameters with those of restactivity cycle (indicator of sleep-wake rhythm) delivered from accelerometry. It was […]

Related Product: MotionWatch

Publication Date: October 14, 2016

The Relationship between Circadian Dysfunction and Cognitive Impairment in Individuals with Parkinson’s Disease

Parkinson’s Disease (PD) is a brain disorder associated with a variety of motor (e.g., rigidity, tremor) and nonmotor (e.g., cognitive impairment, sleep dysfunction) symptoms. Recent evidence suggests that PD patients may also have dysfunctional circadian rhythms: oscillators responsible for many behavioral and physiological functions (e.g., sleep-wake cycle, cognitive performance). No study to date has measured […]

Related Product: MotionWatch

Publication Date: September 5, 2016

O35-2 Current and cumulative night shift work and subclinical atherosclerosis–results of the gutenberg health study

Objectives Research on shift work and cardiovascular health is challenging because of the long follow-up time that is needed to cover late outcomes such as myocardial morbidity (e.g., myocardial infarction), or mortality. The aim of this cross-sectional analysis was to investigate associations and dose-response relationships between (1) current and (2) cumulative exposure to night shift […]

Related Product: MotionWatch

Publication Date: September 1, 2016

O35-4 Course of sleepiness and sleep parameters in 2-2 offshore rotations

Introduction Sleep and fatigue problems are among the most common health and safety concerns in the offshore oil and gas industry. To understand sleep and fatigue problems offshore, we examined the course of sleepiness and sleep parameters across 2-2 offshore rotations and compared pre-departure (1 week), offshore work (2 weeks) and recovery (1 week) periods. […]

Related Product: MotionWatch

Publication Date: September 1, 2016

Disruption of The Presumed Circadian Sleep Maintenance Zone Predicts Cognitive Impairment in Older Adults.

Background Age-related changes in sleep quality are associated with cognitive impairment in older adults and may play a role in the trajectory of cognitive decline in Alzheimer’s disease. Circadian dysregulation of the sleep maintenance zone could in part explain these changes in sleep quality and might be associated with cognitive impairment observed in older adults. […]

Related Product: MotionWatch

Publication Date: July 12, 2016

The investigation of chronobiological aspects of non-visual effects of light in humans.

The chronobiological studies on non-visual lighting effects presented in this postdoctoral thesis show qualitative differences of the same depending on age, long- and short-term adaptation. Chromatic pupillometry was also used to examine the extent to which the pupil reflex on light is suitable for use as a marker for melanopsin-dependent functions in healthy people and […]

Related Product: MotionWatch

Publication Date: January 25, 2016

Circadian sleep/wake rhythm abnormalities as a risk factor of a poststroke apathy

Background Poststroke apathy affects 19–55% of patients following stroke and has a negative impact on functional recovery, general health, and quality of life, as well as being a source of significant burden for caregivers. Aims A major clinical issue is the delayed diagnosis of post-stroke apathy, and so the aim of our study is to […]

Related Product: MotionWatch

Publication Date: July 1, 2015

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