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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MotionWatch 8 Wrist Activity and Light Analysis: from ambulatory recording toward real life monitoring
Background The Author’s interest is to apply physiological recordings for real-life, long-term and unsupervised monitoring as a complement to telemedicine and home care. This means the search for parameters that will be used to alert when some kind of support will be needed. To this end, the Author has recorded and published an appropriate Motionwatch8 […]
Related Product: MotionWatch
Publication Date: June 23, 2022
Inconsistency between objective and subjective comparisons of sleep quality is found between sea level and moderate terrestrial altitude (2,320 m) in high-performance swimmers
It is popular for high-performance athletes to attend training camps at natural moderate altitude (1800–2500m), which may have direct and indirect effects on the quantity and quality of sleep athletes obtain. This can potentially influence the ability to maximise training responses and optimise recovery from exercise. This study aimed to compare objective and subjective markers […]
Related Product: MotionWatch
Publication Date: June 20, 2022
Examining Individual Factors Influencing Adherence and Response to Wholegrains and Nuts in a Series of Interventional N-of-1 Studies
Objectives Inter-individual variations in response to dietary interventions are common, which can be affected by physiological and behavioural factors. N-of-1 studies, where a series of measurements are collected on an individual level over time, can provide insights into the factors which affect response for a single volunteer. The MI-DIET study is a series of N-of-1 […]
Related Product: PRO-Diary
Publication Date: June 14, 2022
Simultaneous recording of subcutaneous temperature and total locomotor activity in Bos-Taurus and Bos-Indicus raised in subtropical region of Argentina
In this study, total locomotor activity and subcutaneous temperature was evaluated in 18 clinically healthy females’ cows. All cows were divided in 3 groups: group A1 was constituted by 6 Holstein Bos-taurus, group A2 by 6 Herford females’ cows Bos-Taurus and group B was constituted by 6 females Bradford Bos-indicus cows. Data recording of total […]
Related Product: Actiwatch Mini
Publication Date: June 13, 2022
Bright Light Increases Alertness and Not Cortisol in Healthy Men: A Forced Desynchrony Study Under Dim and Bright Light
Light-induced improvements in alertness are more prominent during nighttime than during the day, suggesting that alerting effects of light may depend on internal clock time or wake duration. Relative contributions of both factors can be quantified using a forced desynchrony (FD) designs. FD designs have only been conducted under dim light conditions (
Related Product: MotionWatch
Publication Date: June 10, 2022
The temporal relationships between defeat, entrapment and suicidal ideation: ecological momentary assessment study
Background Psychological models of suicidal experiences are largely based on cross-sectional or long-term prospective data with follow-up intervals typically greater than 1 year. Recent time-series analyses suggest that these models may not account for fluctuations in suicidal thinking that occur within a period of hours and/or days. Aims We explored whether previously posited causal relationships […]
Related Product: PRO-Diary
Publication Date: June 3, 2022
Factors Associated with Sleep Quality in Hospitalized Persons with Dementia
Background: Factors associated with sleep quality have not been well examined in hospitalized older persons with dementia, who are at high risk for impaired sleep. The aim was to identify factors associated with sleep quality among hospitalized persons with dementia. Methods: This secondary analysis used baseline data from a cluster randomized trial. Factors examined included […]
Related Product: MotionWatch
Publication Date: June 1, 2022
Energy expenditure and time spent on physical activity in Costa Rican schoolchildren with overweight or obesity by means of the Actiheart accelerometer
Objective: To determine the energy expenditure and time spent on physical activities in Costa Rican overweight or obese schoolchildren in free-living conditions. Methodology: Participants were 31 boys and 13 girls aged 6 to 9 years old (7.6 ± 1.03 years) with overweight or obesity; nutritional status was established by BMI. The variables of the study […]
Related Product: Actiheart
Publication Date: June 1, 2022
Cognition and Music Performance
Because it involves a host of different perceptions, concepts and practices that are linked to particular social considerations, research in music is multifaceted and varied (Cross, 2001). The understanding of music cognition requires the contributions of psychological, neuropsychological, social, cultural, and educational perspectives to provide a full approximation to the phenomenon. Psychological and neuropsychological studies […]
Related Product: Actiheart
Publication Date: June 1, 2022
Evaluating Patterns and Factors Related to Sleep Disturbances in Prostate Cancer Patients
Prostate cancer patients may experience disturbed sleep as a result of their diagnosis or treatment. This study sought to evaluate disturbed sleep and excessive daytime sleepiness in newly diagnosed patients and those receiving androgen deprivation therapy (ADT). This study was conducted with 74 patients. Subjective data using the Pittsburgh Sleep Quality Index (PSQI) and Epworth […]
Related Product: MotionWatch
Publication Date: May 30, 2022
The relationship between physical activity, body fatness and metabolic syndrome in urban South African school teachers: The sympathetic activity and ambulatory blood pressure in Africans study
Background: Globally, the prevalence of metabolic syndrome (MS) is rising because of increased levels of physical inactivity and obesity. In South Africa, information about teachers’ physical activity (PA), body fatness and MS is limited. Aim: To assess the relationship between PA, body fatness and MS in urban South African teachers. Setting: The study setting was […]
Related Product: Actiheart
Publication Date: May 30, 2022
Associations between circadian misalignment and telomere length in BD: an actigraphy study
Background Life expectancy is significantly decreased in bipolar disorder (BD). This is associated with accelerated cellular aging which can be estimated by telomere length (TL). However, specific determinants of shorter TL in BD are under-explored. This study examines whether circadian misalignment (i.e. mismatch between preferred and actual phase of circadian activity rhythms) is associated with […]
Related Product: MotionWatch
Publication Date: May 27, 2022
Associations among pre-sleep arousal, facets of emotion dysregulation, and sleep quality and efficiency during pregnancy
Introduction Pre-sleep arousal contributes to over 50% of pregnant people experiencing poor sleep quality and clinical insomnia. Given that poor sleep during pregnancy is associated with depression and suicide ideation, there is a critical need to identify intervention targets, such as difficulties with emotion regulation. However, emotion dysregulation is multifaceted and warrants further investigation in […]
Related Product: MotionWatch
Publication Date: May 25, 2022
Dynamics of metabolic rate in male individuals due to the meal and regular office activities
Metabolic rate is one of the main parameters affecting the thermal balance of the human body and perception of thermal comfort. Typically, we consider a constant value for a specific type of activity (sitting quiet, standing, etc.) despite the time of the day and body built of a person. In this study, we challenged this […]
Related Product: Actiheart
Publication Date: May 25, 2022
The Exponentially Weighted Moving Average Procedure for Detecting Changes in Intensive Longitudinal Data in Psychological Research in Real-Time: A Tutorial Showcasing Potential Applications
Affect, behavior, and severity of psychopathological symptoms do not remain static throughout the life of an individual, but rather they change over time. Since the rise of the smartphone, longitudinal data can be obtained at higher frequencies than ever before, providing new opportunities for investigating these person-specific changes in real-time. Since 2019, researchers have started […]
Related Product: MotionWatch
Publication Date: May 22, 2022
Work schedule and seasonal influences on sleep and fatigue in helicopter and fixed-wing aircraft operations in extreme environments
Sleep and fatigue were investigated in aviation search and rescue, firefighting, emergency medical services and offshore transfer operations in 210 participants, for 21 days each, across 17 datasets in seven countries. Sleep data were collected using wrist-worn actigraphs and sleep diaries. Sustained attention was assessed using a 5-min Psychomotor Vigilance Task (PVT). Duty information was […]
Related Product: MotionWatch
Publication Date: May 18, 2022
Device-measured sleep onset and duration in the development of depressive symptoms in adolescence
Background Sleep deprivation in adolescence is increasing in prevalence and may be linked to subsequent depression. Findings regarding associations between sleep duration, sleep onset time, and the development of depressive symptoms over time in adolescents are mixed, and rely on subjective measures of sleep. Methods Sleep onset and duration were assessed using a combined heart […]
Related Product: Actiheart
Publication Date: May 17, 2022
The association between sleep disturbance and suicidality in psychiatric inpatients transitioning to the community: protocol for an ecological momentary assessment study
Background: Patients are at high risk of suicidal behavior and death by suicide immediately following discharge from inpatient psychiatric hospitals. Furthermore, there is a high prevalence of sleep problems in inpatient settings, which is associated with worse outcomes following hospitalization. However, it is unknown whether poor sleep is associated with suicidality following initial hospital discharge. […]
Related Product: PRO-Diary
Publication Date: May 17, 2022
The effect of sleep continuity disruption on multimodal emotion processing and regulation: a laboratory‐based, randomised, controlled experiment in good sleepers
Previous research shows that experimental sleep deprivation alters emotion processing, suggesting a potential mechanism linking sleep disruption to mental ill-health. Extending previous work, we experimentally disrupted sleep continuity in good sleepers and assessed next-day emotion processing and regulation using tasks with established sensitivity to depression. In a laboratory-based study, 51 good sleepers (37 female; mean […]
Related Product: MotionWatch
Publication Date: May 16, 2022
Effect of Light Exposure on Serum Melatonin Levels of ICU Patients: A Preliminary Observational Study
Aim: To examine whether the serum melatonin levels in ICU patients are affected by light exposure in the “light” and “dark” parts of the ICU. Method: We measured serum melatonin levels of 10 ICU patients having their bed positioned in the “light part” (artificial and natural light) and “dark part” (only artificial light) of the […]
Related Product: MotionWatch
Publication Date: May 16, 2022
Night‐to‐night variation in sleep associates with day‐to‐day variation in vigilance, cognition, memory, and behavioral problems in Alzheimer’s disease
Introduction Sleep disturbances are commonly reported in people living with Alzheimer’s disease (AD), but it is currently unknown whether night-to-night variation in sleep predicts day-to-day variation in vigilance, cognition, mood, and behavior (daytime measures). Methods Subjective and objective sleep and daytime measures were collected daily for 2 weeks in 15 participants with mild AD, eight […]
Related Product: MotionWatch
Publication Date: May 16, 2022
A window into the tired brain: neurophysiological dynamics of visuospatial working memory under fatigue
Objective We examine the spatiotemporal dynamics of neural activity and its correlates in heart rate and its variability (HR/HRV) during a fatiguing visuospatial working memory task. Background The neural and physiological drivers of fatigue are complex, coupled, and poorly understood. Investigations that combine the fidelity of neural indices and the field-readiness of physiological measures can […]
Related Product: Actiheart
Publication Date: May 14, 2022
The activity patterns of nonworking and working sled dogs
There are limited studies investigating the combined effects of biological, environmental, and human factors on the activity of the domestic dog. Sled dogs offer a unique opportunity to examine these factors due to their close relationship with handlers and exposure to the outdoors. Here, we used accelerometers to measure the activity of 52 sled dogs […]
Related Product: MotionWatch
Publication Date: May 14, 2022
Studies of twin responses to understand exercise THerapy (STRUETH): Cerebrovascular function
We studied monozygotic (MZ) and dizygotic (DZ) twin pairs following resistance (RES) and endurance (END) training to assess genetic and environmental contributions to cerebrovascular function. Cerebrovascular function (rest, autoregulation, hypercapnia, exercise) was assessed in 86 healthy same-sex MZ (30 pairs) and DZ (13 pairs) twins, who underwent 3 months of END and RES. Carbon dioxide […]
Related Product: Actiheart
Publication Date: May 13, 2022
Longitudinal associations of absolute versus relative moderate-to-vigorous physical activity with brain microstructural decline in aging
Higher moderate-to-vigorous intensity (MVPA) may preserve brain structural integrity, but evidence is mostly cross-sectional and relies on absolute PA measures. We examined longitudinal associations of absolute MVPA using population-level activity count thresholds and relative MVPA using individual heart rate reserve (HRR) via Actiheart with subsequent changes in brain diffusion tensor imaging (DTI) over average of […]
Related Product: Actiheart
Publication Date: May 8, 2022
Longitudinal cardio-respiratory fitness prediction through free-living wearable sensors
Cardiorespiratory fitness is an established predictor of metabolic disease and mortality. Fitness is directly measured as maximal oxygen consumption (VO2max), or indirectly assessed using heart rate response to a standard exercise test. However, such testing is costly and burdensome, limiting its utility and scalability. Fitness can also be approximated using resting heart rate and self-reported […]
Related Product: Actiheart
Publication Date: May 6, 2022
Pediatric Appropriate Prolonged-Release Melatonin Minitablet for Insomnia in Children and Adolescents with Autism Spectrum Disorder
Despite high rates of comorbid insomnia among children and adolescents with Autism Spectrum Disorder (ASD), and its negative impact on child development, health and quality of life, there is limited awareness among clinicians of screening for, and treatment of, insomnia in this population. Prolonged-Release Melatonin (PedPRM, available commercially as Slenyto®) is the first authorized drug […]
Related Product: MotionWatch
Publication Date: May 2, 2022
Assessment of impact of stress on objectively and subjectively measured sleep quality in the working population
I N T R O D U C T I ON: Stress is ubiquitous and has a multidirectional impact on our health. One of the most visible problems caused by stress is sleep disturbance. The aim of the study was to evaluate the impact of subjectively assessed stress on objectively and subjectively measured sleep quality […]
Related Product: MotionWatch
Publication Date: May 1, 2022
The Effect of Assessor Presence on Stress and Anxiety Experienced During Clinical Simulation-Based Assessment
Background: Emergency medical care (EMC) has been recognised as an important sector within public health care by the World Health Organisation. Emergency medical care refers to the provision of initial resuscitation, stabilisation, and treatment to acutely ill and injured patients and delivering those patients to the best available definitive care (AFEM Consensus Conference, 2013). As […]
Related Product: Actiheart
Publication Date: May 1, 2022
Sleep behavior and chronotype before and throughout pregnancy
Study objective To compare sleep behavior before and during pregnancy. Methods In this prospective cohort study, healthy women were followed from pre-pregnancy until delivery. At pre-pregnancy and each trimester, participants completed validated questionnaires of chronotype and sleep quality and timing, including the Munich ChronoType Questionnaire, Epworth Sleepiness Scale, and Pittsburgh Sleep Quality Index. The primary […]
Related Product: MotionWatch
Publication Date: April 27, 2022
Soluble (Pro) renin Receptor Is Adversely Associated with Indices of Left Ventricular Structure and Function: The African-PREDICT Study
This study aims to compare soluble (pro)renin receptor [s(P)RR] levels between black and white adults and to explore the associations of left ventricular (LV) structure and function with s(P)RR in the total and ethnicity-stratified groups. The study sample included 1172 apparently healthy black (n = 587) and white (n = 585) participants of the African-PREDICT […]
Related Product: Actiheart
Publication Date: April 25, 2022
Sleep Disturbance and Quality of Life in Rheumatoid Arthritis: Prospective mHealth Study
Background: Sleep disturbances and poor health-related quality of life (HRQoL) are common in people with rheumatoid arthritis (RA). Sleep disturbances, such as less total sleep time, more waking periods after sleep onset, and higher levels of nonrestorative sleep, may be a driver of HRQoL. However, understanding whether these sleep disturbances reduce HRQoL has, to date, […]
Related Product: MotionWatch
Publication Date: April 22, 2022
Aromatase Inhibition Eliminates Sexual Receptivity Without Enhancing Weight Gain in Ovariectomized Marmoset Monkeys
Context Ovarian estradiol supports female sexual behavior and metabolic function. While ovariectomy (OVX) in rodents abolishes sexual behavior and enables obesity, OVX in nonhuman primates decreases, but does not abolish, sexual behavior, and inconsistently alters weight gain. Objective We hypothesize that extra-ovarian estradiol provides key support for both functions, and to test this idea, we […]
Related Product: Actiwatch Mini
Publication Date: April 22, 2022
Rest-Activity Circadian Rhythm and Light Exposure Using Wrist Actigraphy in ICU Patients
Actigraphy (ACTG) is easy to use and has proved reliable in non-critical populations of patients. It has been used to track circadian rest-activity cycles and to identify states of wakefulness and sleep [1]. A more recent study has found that ACTG have a moderate level of agreement with PSG in distinguishing between sleep and wakeful […]
Related Product: MotionWatch
Publication Date: April 18, 2022
Globus Pallidus internus deep brain stimulation: An alternative treatment for Epilesia partialis continua
Resective surgery may involve an unacceptable risk of permanent neurological deficits in drug-resistant epilepsies so alternative strategies are required. In this regard, palliative neuromodulation has shown promise [[1]]. Epilepsia partialis continua (EPC) is an epileptic syndrome defined as a subclass of focal motor status epilepticus manifesting with frequent repetitive epileptic myoclonia affecting the limbs and/or […]
Related Product: MotionWatch
Publication Date: April 17, 2022
Is the skull responsive to bone mineralisation stimuli in children?
Background Whole-body-less-head (WBLH) is the recommended skeletal region of interest (ROI) for dual-energy X-ray absorptiometry (DXA) assessment of bone mineral density (BMD) in children. Historically it has been suggested that the skull is less responsive than the rest of the skeleton to stimuli that affect BMD but there are few published data to support this […]
Related Product: Actiheart
Publication Date: April 12, 2022
Breastfeeding is related to atypical autonomic and behavior regulation in infants with a history of excessive crying
The study investigated autonomic regulation during feeding in six-month old infants with a history of excessive crying (EC) and social-behavioral development at 12 and 24 months. When contrasted with non-EC infants (NEC), EC infants had atypical autonomic responses observed as dampened reductions in respiratory sinus arrhythmia (RSA) and decreases in heart period (HP) during feeding. […]
Related Product: Actiheart
Publication Date: April 11, 2022
On the Road to Camarón: The Sleep of an Ultra-Endurance Athlete Cycling 10,000 km in 24 Days
The impact of sleep on performance is fundamental for ultra-endurance athletes, but studies on this issue are rare. The current investigation examined the sleep and performance of a cyclist engaged in a simulated 10,000 km tour. The sleep behavior of the athlete (age, 57; height, 1.85 m; mass, 81 kg) before, during (i.e., 23 nights), […]
Related Product: MotionWatch
Publication Date: April 9, 2022
The influence of clinic care on perceptions and knowledge of non-communicable diseases and physical activity from a low-resourced community: a mixed-method study
Background Health promotion for the management of risk factors for non-communicable diseases (NCDs) is an integral part of standard care in South Africa. Most persons presenting with NCDs utilise public primary health care centres for disease management. This mixed-methods study aimed at expanding current understanding of the the influence of standard clinic care (usual care) […]
Related Product: Actiheart
Publication Date: April 7, 2022
Neural spatio-temporal patterns of information processing related to cognitive conflict and correct or false recognitions
Using a visual short-term memory task and employing a new methodological approach, we analyzed neural responses from the perspective of the conflict level and correctness/erroneous over a longer time window. Sixty-five participants performed the short-term memory task in the fMRI scanner. We explore neural spatio-temporal patterns of information processing in the context of correct or […]
Related Product: MotionWatch
Publication Date: March 28, 2022
Effects of experimental sleep restriction on energy intake, energy expenditure, and visceral obesity
Background Although the consequences of sleep deficiency for obesity risk are increasingly apparent, experimental evidence is limited and there are no studies on body fat distribution. Objectives The purpose of this study was to investigate the effects of experimentally-induced sleep curtailment in the setting of free access to food on energy intake, energy expenditure, and […]
Related Product: MotionWatch
Publication Date: March 28, 2022
The contribution of latent factors of executive functioning to mind wandering: An experience sampling study
Accumulating evidence suggests that individuals with greater executive resources spend less time mind wandering. Independent strands of research further suggest that this association depends on concentration and a guilty-dysphoric daydreaming style. However, it remains unclear whether this association is specific to particular features of executive functioning or certain operationalizations of mind wandering, including task-unrelated thoughts […]
Related Product: PRO-Diary
Publication Date: March 28, 2022
An Exploratory Study on the Physical Activity Health Paradox—Musculoskeletal Pain and Cardiovascular Load during Work and Leisure in Construction and Healthcare Workers
Using a novel approach, this exploratory study investigated whether the physical activity (PA) paradox extends to cardiovascular load and musculoskeletal pain. At baseline, 1–2 days of 24 h heart rate was assessed in 72 workers from construction and healthcare. Workers then reported pain intensity in 9 body regions (scale 0–3) every 6 months for two […]
Related Product: Actiheart
Publication Date: March 26, 2022
Efficacy of light therapy for cancer-related fatigue in (non-) Hodgkin Lymphoma survivors: results of a randomized controlled trial
Cancer-related fatigue is one of the most frequently reported symptoms after treatment for (non-)Hodgkin lymphoma. This dissertation describes the procedure and results of the SPARKLE trial which primarily aimed to investigate whether light therapy can be used as a treatment for chronic cancer-related fatigue since the diagnosis of Hodgkin lymphoma or diffuse large B-cell lymphoma. […]
Related Product: MotionWatch
Publication Date: March 24, 2022
Time Course of Motor Sleep Inertia Dissipation According to Age
Sleep inertia (SI) refers to a complex psychophysiological phenomenon observed after morning awakening that can be described as the gradual recovery of waking-like status after a night of sleep. The time course of SI dissipation in an everyday life condition is little studied. The present study aims to investigate the SI dissipation in motor activity, […]
Related Product: MotionWatch
Publication Date: March 23, 2022
Timely sleep coupling: spindle-slow wave synchrony is linked to early amyloid-β burden and predicts memory decline
Sleep alteration is a hallmark of ageing and emerges as a risk factor for Alzheimer’s disease (AD). While the fine-tuned coalescence of sleep microstructure elements may influence age-related cognitive trajectories, its association with AD processes is not fully established. Here, we investigated whether the coupling of spindles and slow waves is associated with early amyloid-beta […]
Related Product: MotionWatch
Publication Date: March 19, 2022
Exercise Intervention Changes the Perceptions and Knowledge of Non-Communicable Disease Risk Factors among Women from a Low-Resourced Setting
We employed the Health Belief Model (HBM) as a theoretical lens to explore the influence of an exercise intervention on the perceptions and knowledge of modifiable risk factors for non-communicable diseases (NCDs) among women from a low-resource setting in South Africa. We used a mixed-methods design, gathering qualitative and quantitative data at baseline (n = […]
Related Product: Actiheart
Publication Date: March 15, 2022
Exploring the relationship of sleep, cognition, and cortisol in sickle cell disease
Background Neurocognitive impairment is common in people with Sickle Cell Disease (SCD) and evidence is accumulating that sleep disturbances play a role. The interaction between cortisol and sleep in the general population is associated with cognition as well as general wellbeing but there are few data in SCD. We aimed to understand the relationship between […]
Related Product: MotionWatch
Publication Date: March 12, 2022
Testing Function Focused Care for Acute Care using the Evidence Integration Triangle: Protocol description
This manuscript provides the protocol for a National Institute of Aging-funded cluster randomized clinical trial that focuses on helping nurses in acute care to engage patients with dementia in physical activity while hospitalized using an approach referred to as function-focused care. Physical activity is defined as bodily movement produced by skeletal muscles resulting in the […]
Related Product: MotionWatch
Publication Date: March 11, 2022
Impact of sleep timing on attention, sleepiness, and sleep quality among real-life night shift workers with shift work disorder: a cross-over clinical trial
Study objectives: To examine the effect of sleep timing intervention on sleep quality, attention, and sleepiness at work among night shift workers with shift work disorder. Methods: We recruited 60 real-life night shift workers through advertisements to participate this cross-over clinical trial. Shift work disorder was confirmed with interview and sleep log. Participants were designated […]
Related Product: MotionWatch
Publication Date: March 10, 2022
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