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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Energy expenditure and intensity of ritual jumping–dancing in male Maasai
Objectives Traditional jumping–dance rituals performed by Maasai men involve prolonged physical exertion that may contribute significantly to overall physical activity level. We aimed to objectively quantify the metabolic intensity of jumping–dance activity and assess associations with habitual physical activity and cardiorespiratory fitness (CRF). Methods Twenty Maasai men (18–37 years) from rural Tanzania volunteered to participate in […]
Related Product: Actiheart
Publication Date: May 3, 2023
Exploring the Relationship between Disordered Sleep and Mood in Male Anorexia Nervosa: An Actigraphy Study
Eating disorders (EDs), including anorexia nervosa (AN), are severe psychological disorders that affect individuals’ eating behaviours and body perception. Previous research has shown that people with EDs often report poorer sleep. Some literature has suggested that it is mood dysregulation that mediates the link between EDs and sleep. However, the majority of previous studies only […]
Related Product: MotionWatch
Publication Date: May 2, 2023
Neurobehavioral Consequences of Early-Life Wildfire Smoke Exposure
Rationale: Wildfire smoke is recognized by the US Environmental Protection Agency as a major source of particulate matter under 2.5 microns diameter (PM2.5 ) emissions which is expected to increase in the future because of climate change. There is an abundance of epidemiologic and mechanistic data supporting the link between poor air quality and respiratory […]
Related Product: Actiwatch Mini
Publication Date: May 1, 2023
Multimodal investigation of melanopsin retinal ganglion cells in Alzheimer’s disease
Objective In Alzheimer’s disease (AD), the presence of circadian dysfunction is well-known and may occur early in the disease course. The melanopsin retinal ganglion cell (mRGC) system may play a relevant role in contributing to circadian dysfunction. In this study, we aimed at evaluating, through a multimodal approach, the mRGC system in AD at an […]
Related Product: MotionWatch
Publication Date: April 23, 2023
Cardiovascular risk and kidney function profiling using conventional and novel biomarkers in young adults: the African-PREDICT study
Background Low- and middle-income countries experience an increasing burden of chronic kidney disease. Cardiovascular risk factors, including advancing age, may contribute to this phenomenon. We (i) profiled cardiovascular risk factors and different biomarkers of subclinical kidney function and (ii) investigated the relationship between these variables. Methods We cross-sectionally analysed 956 apparently healthy adults between 20 […]
Related Product: Actiheart
Publication Date: April 13, 2023
Exercise and Artery Function in Twins: Sex Differences in a Cross-Over Trial
Background: Physical activity reduces cardiovascular risk, partly via direct effects on the arterial wall. We hypothesized that vascular function responses would be modality-specific, sex-dependent, and express a high degree of heritability. Methods: We recruited 90 same-sex twins (31 monozygotic, 14 dizygotic dizygotic pairs; 25.8±6.0 years) and randomized 70 (25 monozygotic, 10 dizygotic) to complete, as […]
Related Product: Actiheart
Publication Date: April 10, 2023
Assessment of Energy and Nutrient Intake and the Intestinal Microbiome (ErNst Study): Protocol and Methods of a Cross-sectional Human Observational Study
Background: On the national level, nutritional monitoring requires the assessment of reliable representative dietary intake data. To achieve this, standardized tools need to be developed, validated, and kept up-to-date with recent developments in food products and the nutritional behavior of the population. Recently, the human intestinal microbiome has been identified as an essential mediator between […]
Related Product: Actiheart
Publication Date: April 7, 2023
Development of a Web Interface for the Dynamic Visualization of Evaluation Test Results to Improve the Follow-up for French Elite Athletes
Currently, the SEP laboratory has developed a system to automatically generate PDF reports summarizing the results of evaluation tests. This system works well in production but has several limitations. In fact, the use of OriginPro software is an obstacle because of the need for a paid license and hence its use is often limited to […]
Related Product: MotionWatch
Publication Date: April 6, 2023
Improving sleep and learning in rehabilitation after stroke, part 2 (INSPIRES2): study protocol for a home-based randomised control trial of digital cognitive behavioural therapy (dCBT) for insomnia
Introduction Consolidation of motor skill learning, a key component of rehabilitation post-stroke, is known to be sleep dependent. However, disrupted sleep is highly prevalent after stroke and is often associated with poor motor recovery and quality of life. Previous research has shown that digital cognitive behavioural therapy (dCBT) for insomnia can be effective at improving […]
Related Product: MotionWatch
Publication Date: April 6, 2023
The evolving role of quantitative actigraphy in clinical sleep medicine
Actigraphy has a consolidated role in Insomnia and Circadian Rhythm Sleep-Wake Disorders (CRSWD) and recent studies have highlighted the use of actigraphy for narcolepsy and REM sleep behaviour disorder (RBD). This review aims at summarising the results of studies published over the last decade regarding the use of actigraphy. Thirty-five studies proved eligible, and results […]
Related Product: MotionWatch
Publication Date: April 1, 2023
Effectiveness of home-based videoconference interventions through Physical Exercise Training, Bright Light Exposure and Galvanic Vestibular Stimulation on Sleep in Older Adults: Study Protocol for a Randomized Controlled Trial
Background: Aging is characterized by substantial changes in sleep architecture that negatively impact physical fitness, quality of life, mood or cognitive functioning. Older adults often fail to reach the recommended amount of physical activity to prevent the age-related decline sleep function, partly because of geographical barriers. Home-based interventions could overcome these barriers preventing older adults […]
Related Product: MotionWatch
Publication Date: March 30, 2023
Behavior Modeling Approach for Forecasting Physical Functioning of People with Multiple Sclerosis
Forecasting physical functioning of people with Multiple Sclerosis (MS) can inform timely clinical interventions and accurate “day planning” to improve their well-being. However, people’s physical functioning often remains unchecked in between infrequent clinical visits, leading to numerous negative healthcare outcomes. Existing Machine Learning (ML) models trained on in-situ data collected outside of clinical settings (e.g., […]
Related Product: PRO-Diary
Publication Date: March 28, 2023
Risk Ahead: Actigraphy-based early-warning signals of increases in depressive symptoms during antidepressant discontinuation
Antidepressant discontinuation increases the risk of experiencing depressive symptoms. In a repeated single-subject design, we tested whether transitions in depression were preceded by increases in actigraphy-based critical-slowing-down-based early-warning signals (EWSs; variance, kurtosis, autocorrelation), circadian-rhythm-based indicators, and decreases in mean activity levels. Four months of data from 16 individuals with a transition in depression and nine […]
Related Product: MotionWatch
Publication Date: March 25, 2023
Identifying a urinary peptidomics profile for hypertension in young adults: The African‐PREDICT study
Hypertension is one of the most important and complex risk factors for cardiovascular diseases (CVDs). By using urinary peptidomics analyses, we aimed to identify peptides associated with hypertension, building a framework for future research towards improved prediction and prevention of premature development of CVD. We included 78 hypertensive and 79 normotensive participants from the African-PREDICT […]
Related Product: Actiheart
Publication Date: March 21, 2023
The effect of caloric restriction on genetical pathways
Energy restriction is defined as reducing nutrient intake without dragging the organism into malnutrition. Energy restriction is preferred because it is a non-genetic intervention that increases life expectancy. Nicotinamide adenine dinucleotide (NAD+) and adenosine monophosphate (AMP) levels, which are the indicators of intracellular energy deficiency, increase with energy restriction. The increase in NAD+ level stimulates […]
Related Product: Actiheart
Publication Date: March 21, 2023
Light-induced Melatonin Suppressions by 1000-Hz Flickering and Nonflickering Blue Light Conditions
Night bright light is known to suppress melatonin secretion. However, novel photoreceptors, named intrinsically photosensitive retinal ganglion cells, are mainly responsible for projecting dark/bright information to the superchiasmatic nucleus and thus regulating the circadian system. It has been shown that a 100-Hz flickering light suppresses melatonin secretion more than the nonflickering one even if the […]
Related Product: MotionWatch
Publication Date: March 15, 2023
How Does Occupational Lifting Affect Ambulatory Blood Pressure, Relative Aerobic Workload and Level of Physical Activity?
Introduction Occupational physical activity (OPA), including occupational lifting (OL), seems to increase the risk of cardiovascular disease (CVD). Knowledge about the association between OL and risk of CVD is sparse, but repeated OL is assumed to result in prolonged raised blood pressure and heart rate (HR) eventually augmenting the risk of CVD. To disentangle parts […]
Related Product: Actiheart
Publication Date: March 11, 2023
Rest-Activity Rhythm, Pain, and Motor Activity in Multiple Sclerosis
BACKGROUND Although the relationships among physical disability, mood disorders, and pain are well described in multiple sclerosis (MS), little is known about whether those symptoms are associated with sleep disturbances. METHODS Forty-six patients with MS experiencing pain participated. Sleep was indirectly measured by assessing rest-activity rhythm via actigraphy: interdaily stability, intradaily variability, and relative amplitude. […]
Related Product: MotionWatch
Publication Date: March 8, 2023
Impact of minimally invasive surgery on surgeon health (ISSUE) study: protocol of a single-arm observational study conducted in the live surgery setting
Introduction The rapid evolution of minimally invasive surgery has had a positive impact on patient outcomes; however, it is reported to be associated with work-related musculoskeletal symptoms (WMS) in surgeons. Currently there is no objective measure to monitor the physical and psychological impact of performing a live surgical procedure on the surgeon. Methods and analysis […]
Related Product: Actiheart
Publication Date: March 7, 2023
Investigating mental defeat in individuals with chronic pain: Protocol for a longitudinal experience sampling study
Introduction Previous qualitative and cross-sectional research has identified a strong sense of mental defeat in people with chronic pain who also experience the greatest levels of distress and disability. This study will adopt a longitudinal experience sampling design to examine the within-person link between the sense of mental defeat and distress and disability associated with […]
Related Product: MotionWatch
Publication Date: March 6, 2023
Lack of Diurnal Variation in Salivary Cortisol Is Linked to Sleep Disturbances and Heightened Anxiety in Adolescents with Williams Syndrome
Objective: The aim of the current study was to examine the potential relationship between sleep patterns, cortisol levels, and anxiety profiles in adolescents with Williams Syndrome (WS) compared to typically developing adolescents. Method: Thirteen adolescents with WS and thirteen TD adolescents (age range 12–18 years) were recruited. Participants were provided with a “testing kit”, containing […]
Related Product: MotionWatch
Publication Date: March 3, 2023
Genetic background to attention deficit and hyperactivity disorder and attention deficit and hyperactivity disorder symptoms at the age of 5 years: the role of sleep duration
Study Objectives We studied the associations between polygenic risk score (PRS) for attention deficit and hyperactivity disorder (ADHD) and (1) ADHD symptoms in 5-year-old children, (2) sleep duration throughout childhood, and (3) the interaction between PRS for ADHD and short sleep duration relative to ADHD symptoms at 5 years. Methods This study is based on […]
Related Product: MotionWatch
Publication Date: March 1, 2023
Internal desynchronization of circadian rhythms in 14 “free run” people living in a cave – Mission Deep Time
Objective Since the 1960s, it has been established that the endogenous rhythm of the circadian clock is approximately 24.5 h in the absence of any time donor. The objective of our study is to determine if a group of people living out of time will present the same rhythm as previously observed and if this […]
Related Product: MotionWatch
Publication Date: March 1, 2023
Phenotypic divergence in sleep and circadian cycles linked by affective state and environmental risk related to psychosis
Study Objectives Environmental cues influence circadian rhythm timing and neurochemicals involved in the regulation of affective behavior. How this interplay makes them a probable nonspecific risk factor for psychosis is unclear. We aimed to identify the relationship between environmental risk for psychosis and circadian timing phenotypes sampled from the general population. Methods Using an online […]
Related Product: MotionWatch
Publication Date: March 1, 2023
Changes in nocturnal heart rate variability in people living with HIV during the first year of antiretroviral therapy compared to HIV-uninfected community controls
Background: Higher nocturnal heart rate and lower nocturnal heart rate variability (HRV) is associated with increased cardiovascular disease mortality. Longitudinal studies on nocturnal HRV in people living with HIV (PLWH) are lacking. Methods: We conducted a one-year prospective cohort study of adult PLWH and HIV-uninfected community controls in north-western Tanzania. At enrollment, we collected data […]
Related Product: Actiheart
Publication Date: March 1, 2023
A feasibility study of pre-sleep audio and visual alpha brain entrainment for people with chronic pain and sleep disturbance
Introduction: Chronic pain and sleep disturbance are bi-directionally related. Cortical electrical activity in the alpha frequency band can be enhanced with sensory stimulation via the phenomenon of entrainment, and may reduce pain perception. A smartphone based programme which delivers 10 Hz stimulation through flickering light or binaural beats was developed for use at night, pre-sleep, with […]
Related Product: MotionWatch
Publication Date: February 23, 2023
Combining actigraphy and experience sampling to assess physical activity and sleep in patients with psychosis: A feasibility study
Background: Sleep disorders and reduced physical activity are common in patients with psychosis and can be related to health-related outcomes such as symptomatology and functioning. Mobile health technologies and wearable sensor methods enable continuous and simultaneous monitoring of physical activity, sleep, and symptoms in one’s day-to-day environment. Only a few studies have applied simultaneous assessment […]
Related Product: MotionWatch
Publication Date: February 23, 2023
Dynamics of working memory process revealed by independent component analysis in an fMRI study
Human memory is prone to errors in many everyday activities but also when cultivating hobbies such as traveling and/or learning a new language. For instance, while visiting foreign countries, people erroneously recall foreign language words that are meaningless to them. Our research simulated such errors in a modified Deese-Roediger-McDermott paradigm for short-term memory with phonologically […]
Related Product: MotionWatch
Publication Date: February 18, 2023
Evidence for protein leverage in a general population sample of children and adolescents
Background/Objectives The strong regulation of protein intake can lead to overconsumption of total energy on diets with a low proportion of energy from protein, a process referred to as protein leverage. The protein leverage hypothesis posits that protein leverage explains variation in energy intake and potentially obesity in ecological settings. Here, we tested for protein […]
Related Product: Actiheart
Publication Date: February 16, 2023
Improving sleep after stroke: a randomised controlled trial of digital cognitive behavioural therapy for insomnia
Stroke is frequently accompanied by long-term sleep disruption. We therefore aimed to assess the efficacy of digital cognitive behavioural therapy (dCBT) for insomnia to improve sleep after stroke. A parallel group randomised controlled trial was conducted remotely in participant’s homes/online. Randomisation was online with minimisation of between-group differences in age and baseline Sleep Condition Indicator […]
Related Product: MotionWatch
Publication Date: February 8, 2023
Sleep problems in children with Angelman Syndrome: The effect of a behavioral intervention program
Background & aims The aim of this study was to investigate the effect of a behavioral intervention on sleep problems, which are significant and an unmet clinical need in children with Angelman Syndrome (AS). Methods & procedures Children (2–18 years) with AS and sleep problems were randomized to a behavioral intervention program or a control […]
Related Product: MotionWatch
Publication Date: February 6, 2023
Open-source Python routines for the analysis of personalized light exposure data
Light exposure fundamentally influences human physiology and behavior, with light being the most important zeitgeber of the circadian system. Throughout the day, people are exposed to various scenes differing in light level, spectral composition and spatiotemporal properties. Personalized light exposure can be measured through wearable light loggers and dosimeters, including wrist-worn actimeters containing light sensors, […]
Related Product: MotionWatch
Publication Date: February 1, 2023
An Interventional Response Phenotyping Study in Chronic Low Back Pain: Protocol for a Mechanistic Randomized Controlled Trial
Evidence-based treatments for chronic low back pain (cLBP) typically work well in only a fraction of patients, and at present there is little guidance regarding what treatment should be used in which patients. Our central hypothesis is that an interventional response phenotyping study can identify individuals with different underlying mechanisms for their pain who thus […]
Related Product: PRO-Diary
Publication Date: January 27, 2023
Effects of short naps during simulated night shifts on alertness and cognitive performance in young adults
While short daytime naps have been found to provide alertness and performance benefits without inducing sleep inertia, the effects of a similar napping strategy during nights shifts are largely unknown. This study examined the effects of a 20-min nap (scheduled at 2:00 a.m.) during night shifts among 16 participants (mean [SD] age 22.0 [1.08] years) who […]
Related Product: MotionWatch
Publication Date: January 26, 2023
Peripheral blood flow estimated by laser doppler flowmetry provides additional information about sleep state beyond that provided by pulse rate variability
Pulse rate variability (PRV), derived from Laser Doppler flowmetry (LDF) or photoplethysmography, has recently become widely used for sleep state assessment, although it cannot identify all the sleep stages. Peripheral blood flow (BF), also estimated by LDF, may be modulated by sleep stages; however, few studies have explored its potential for assessing sleep state. Thus, […]
Related Product: MotionWatch
Publication Date: January 26, 2023
The association between plasma zinc concentrations and markers of glucose metabolism in adults in Cameroon
An abnormal Zn status has been suggested to play a role in the pathogenesis of type 2 diabetes. However, epidemiological studies of the relationship between plasma Zn concentrations and diabetes are sparse and inconclusive. We aimed to investigate the association between plasma Zn concentrations and glycaemic markers (fasting glucose, 2-h glucose and homeostatic model assessment […]
Related Product: Actiheart
Publication Date: January 25, 2023
Coping as a Moderator of Associations Between Symptoms and Functional and Affective Outcomes in the Daily Lives of Individuals With Multiple Sclerosis
Background Pain and fatigue are highly prevalent in multiple sclerosis (MS) and are associated with adverse physical, social, and psychological outcomes. There is a critical need to identify modifiable factors that can reduce the impact of these symptoms on daily life. Purpose This study examined the moderating role of dispositional coping in the relationships between […]
Related Product: PRO-Diary
Publication Date: January 22, 2023
Suckling lamb presence influences the daily rhythm of total locomotor activity in grazing Pampinta dairy ewes
The objective of this study was to investigate the influence of different reproductive stages and livestock management conditions on the pattern of the daily rhythm of total locomotor activity in Pampinta dairy ewes. We recorded 24 hour(h)/day of total locomotor activity in 10 Pampinta dairy ewes during 2 different stages of 60 days each: in […]
Related Product: Actiwatch Mini
Publication Date: January 16, 2023
Case Report: Effect of low energy availability and training load on sleep in a male combat sport athlete
Purpose: The aim of this case report was to describe the sleep responses in a male combat sport athlete, who was engaging in both chronic (CWL) and acute (AWL) weight loss practices in order to reduce body mass for a national competition. Methods: During the first seven weeks of training (Phases 1 and 2), the […]
Related Product: Actiheart
Publication Date: January 6, 2023
Breaking up sitting with short frequent or long infrequent physical activity breaks does not lead to compensatory changes in appetite, appetite-regulating hormones or energy intake
The aim of this study was to determine the appetite-related responses to breaking up prolonged sitting with physical activity bouts differing in frequency and duration among adult females. Fourteen sedentary females aged 34 ± 13 years with a body mass index of 27.1 ± 6.3 kg/m2 (mean ± SD) took part in a randomised crossover […]
Related Product: Actiheart
Publication Date: January 4, 2023
Feeling and mental stress when wearing an oral appliance for obstructive sleep apnea syndrome: Comparison of mono-block type and two-piece type
One of the treatments for obstructive sleep apnea syndrome (OSAS) is the use of an oral appliance (OA). Although many papers have shown a certain degree of effectiveness in treating OA, one of the drawbacks of the device is the discomfort and mental burden it causes when worn. One of the reasons for this is […]
Related Product: MotionWatch
Publication Date: January 1, 2023
Sedentary Lifestyle Implication on Cardio-Autonomic Function and Adaptation to Archery as a Reversible Intervention
The study’s objectives were to investigate the effects of a 12-week sedentary lifestyle on heart rate variability (HRV) and the effectiveness of archery as an intervention in a sedentary young population. 34 young people were divided into the sedentary group (SG) and the archery group at random (IG). While IG underwent a 12-week archery intervention […]
Related Product: Actiheart
Publication Date: January 1, 2023
Real-Time Measurement of the Daily Total Locomotor Behavior in Calves Reared in an Intensive Management System for the Possible Application in Precision Livestock Farming
Intensive farm conditions have an impact on welfare and can reduce the locomotor behavior of calves. The Actiwatch-Mini® (Cambridge Neurotechnology Ltd., Cambridg, UK), an actigraphy-based data logger was used to record the total locomotor behavior of 30-day-old calves, which showed diurnal daily rhythmicity. An individual daily rhythm of total locomotor behavior has also been found […]
Related Product: Actiwatch Mini
Publication Date: January 1, 2023
Heart Rate Variability and Stress in the Intensive Care Unit Nursing Workplace
Intensive care unit (ICU) nurses work in a demanding environment, facing repeated encounters with trauma and ethical issues when caring for patients. Psychological stressors can include death of patients, violent acts by patients or their families, caring for suffering patients, and moral distress from performing futile care. These factors place ICU nurses at increased risk […]
Related Product: Actiheart
Publication Date: January 1, 2023
Effects of Near-Infrared Light on Well-Being and Health in Human Subjects with Mild Sleep-Related Complaints: A Double-Blind, Randomized, Placebo-Controlled Study
In Western societies, people spend most of their waking hours indoors, exposing themselves to virtually no sunlight. Natural sunlight contains all visible and non-visible spectral characteristics of light. Both play key roles in human health and well-being. In this particular context, the non-visible near-infrared light has been shown to be beneficial for a wide range […]
Related Product: MotionWatch
Publication Date: December 29, 2022
Short, frequent high-intensity physical activity breaks reduce appetite compared with a continuous moderate-intensity exercise bout
A single exercise session can affect appetite-regulating hormones and suppress appetite. The effects of short, regular physical activity breaks across the day on appetite are unclear. This study investigated the effects of breaking up sitting with high-intensity physical activity vs a single bout of moderate-intensity exercise and prolonged sitting on appetite control. In this randomised […]
Related Product: Actiheart
Publication Date: December 22, 2022
Function Focused Care For Acute Care: Overcoming Recruitment, Measurement, And Implementation Post-Covid-19
To help patients spend more time engaged in physical activities and avoid the complications that occur Function Focused Care for Acute Care was developed (FFC-AC-EIT). FFC-AC-EIT includes the implementation of four steps: (1) Environment and policy assessments; (2) Education of staff; (3) Establishing patient goals; and (4) Mentoring and motivating of staff, patients, and families. […]
Related Product: MotionWatch
Publication Date: December 20, 2022
Theoretical construct into blocks of actigraphic-derived sleep parameters
Actigraphic parameters can provide indication of people’s sleep quality during their daily lives. However, there is a need for clear guidelines on the understanding of the different actigraphic parameters. The present study aims to propose a conceptual and theoretical framework for known actigraphic-derived parameters, which is able to describe the alternation between rest and wake […]
Related Product: MotionWatch
Publication Date: December 19, 2022
The effects of individual music therapy in nursing home residents with dementia to improve general well-being: study protocol of a randomized controlled trial
Background: Dementia is often associated with Neuropsychiatric Symptoms (NPS) such as agitation, depression, hallucinations, anxiety, that can cause distress for the resident with dementia in long-term care settings and can impose emotional burden on the environment. NPS are often treated with psychotropic drugs, which, however, frequently cause side effects. Alternatively, non-pharmacological treatments approaches can improve […]
Related Product: MotionWatch
Publication Date: December 16, 2022
Circadian phase advances in children during camping life according to the natural light-dark cycle
Background It is known that the circadian rhythm phase in adults can be advanced in a natural light-dark cycle without electrical lighting. However, the effect of advanced sleep-wake timing according to the natural light-dark cycle on children’s circadian phase is unclear. We investigated the effects of approximately 2 weeks of camping life with little access […]
Related Product: MotionWatch
Publication Date: December 16, 2022
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