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 1051 Results

Effectiveness of Minimal Contact Interventions: An RCT

Introduction Around 23% of adults worldwide are insufficiently active. Wearable devices paired with virtual coaching software could increase physical activity. The effectiveness of 3 minimal contact interventions (paper-based physical activity diaries, activity trackers, and activity trackers coupled with virtual coaching) in increasing physical activity energy expenditure and cardiorespiratory fitness were compared over 12 weeks among […]

Related Product: Actiheart

Publication Date: February 18, 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


Independent and combined associations between fast-food outlet exposure and genetic risk for obesity: a population-based, cross-sectional study in the UK

Background Characteristics of the built environment, such as neighbourhood fast-food outlet exposure, are increasingly recognised as risk factors for unhealthy diet and obesity. Obesity also has a genetic component, with common genetic variants explaining a substantial proportion of population-level obesity susceptibility. However, it is not known whether and to what extent associations between fast-food outlet […]

Related Product: Actiheart

Publication Date: February 15, 2021


Determinants of peak fat oxidation rates during cycling in healthy men and women

This study explored lifestyle and biological determinants of peak fat oxidation (PFO) during cycle ergometry, using duplicate measures to account for day-to-day variation. Seventy-three healthy adults (age range: 19–63 years; peak oxygen consumption [˙VO2peak]:42.4[10.1]ml⋅kgBM−1⋅min−1; n = 32 women]) completed trials 7–28 days apart that assessed resting metabolic rate, a resting venous blood sample, and PFO by indirect calorimetry during […]

Related Product: Actiheart

Publication Date: February 14, 2021


Isotemporal Substitution of Time Between Sleep and Physical Activity: Associations With Cardiovascular Risk Factors in Early Rheumatoid Arthritis

Objective We aimed to determine relationships between objectively measured nightly sleep, sedentary behavior (SB), light physical activity (LPA), and moderate to vigorous physical activity (MVPA) with risk factors for cardiovascular disease (CVD) in patients with early rheumatoid arthritis (RA). Furthermore, we aimed to estimate consequences for these risk factors of theoretical displacements of 30 minutes […]

Related Product: Actiheart

Publication Date: February 11, 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 independent and interactive associations of physical activity intensity and vitamin D status with bone mineral density in prepubertal children: the PANIC Study

Summary It is unclear how physical activity intensity and vitamin D status are related to bone health in prepubertal children. We found positive associations between vitamin D status and moderate-to-vigorous physical activity with bone in boys and girls. This highlights the importance of lifestyle factors for skeletal health prepuberty. Introduction The sex-specific independent and interactive […]

Related Product: Actiheart

Publication Date: February 5, 2021


Wearable Devices Suitable for Monitoring Twenty Four Hour Heart Rate Variability in Military Populations

Heart rate variability (HRV) measurements provide information on the autonomic nervous system and the balance between parasympathetic and sympathetic activity. A high HRV can be advantageous, reflecting the ability of the autonomic nervous system to adapt, whereas a low HRV can be indicative of fatigue, overtraining or health issues. There has been a surge in […]

Related Product: Actiheart

Publication Date: February 4, 2021


The travel demands of an elite rugby sevens team: Effects on objective and subjective sleep parameters

Purpose: To explore the effects of travel related to international rugby sevens competition on sleep patterns. Methods: A total of 17 international male rugby sevens players participated in this study. Actigraphic and subjective sleep assessments were performed daily during 2 separate Sevens World Series competition legs (Oceania and America). The duration of each competition leg […]

Related Product: MotionWatch

Publication Date: February 4, 2021


DPSleep: Open-Source Longitudinal Sleep Analysis From Accelerometer Data

Wearable devices are now widely available to collect continuous objective behavioral data from individuals and to measure sleep. Here we introduce a pipeline to infer sleep onset, duration, and quality from raw accelerometer data and then quantify relationships between derived sleep metrics and other variables of interest. The pipeline released here for the deep phenotyping […]

Related Product: MotionWatch

Publication Date: February 4, 2021


Can actigraphy be used to define lithium response dimensions in bipolar disorders?

Background: Actigraphy is commonly used in case-control studies to explore sleep-wake patterns and circadian rhythmicity in bipolar disorders (BD). However, there is limited ecological research regarding actigraphy parameters associated with response to lithium (Li_Resp). Methods: Outpatients with BD-I (n=70) and BD-II (n=20) who were all prescribed prophylactic Li undertook 21 consecutive days of actigraphy recording. […]

Related Product: MotionWatch

Publication Date: February 2, 2021


β-Lactoglobulin Elevates Insulin and Glucagon Concentrations Compared with Whey Protein—A Randomized Double-Blinded Crossover Trial in Patients with Type Two Diabetes Mellitus

Whey protein is an insulinotropic fraction of dairy that reduces postprandial glucose levels in patients with type 2 diabetes mellitus (T2DM). We have recently shown that β-lactoglobulin (BLG), the largest protein fraction of whey, elevates insulin concentrations compared with iso-nitrogenous whey protein isolate (WPI) in healthy individuals. We therefore hypothesized that BLG pre-meals would lower […]

Related Product: Actiheart

Publication Date: January 22, 2021


Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness

Smartphone usage strongly increased in the last decade, especially before bedtime. There is growing evidence that short-wavelength light affects hormonal secretion, thermoregulation, sleep and alertness. Whether blue light filters can attenuate these negative effects is still not clear. Therefore, here, we present preliminary data of 14 male participants (21.93 ± 2.17 years), who spent three […]

Related Product: MotionWatch

Publication Date: January 22, 2021


A brief report of sleep and circadian rhythm quotas in a population of dog owners in North Carolina USA

Objectives To characterize sleep and circadian rhythms of a sample population of healthy, dog-owning adults from North Carolina, USA. Methods Actigraphy was used to analyze sleep-wake patterns in forty-two dog owners from the Raleigh area in North Carolina. Sleep quotas, including sleep duration, efficiency, and fragmentation were measured alongside a Non-parametric Circadian Rhythms Analysis (NPCRA) […]

Related Product: MotionWatch

Publication Date: January 22, 2021


Sleep, Circadian Rhythmicity and Response to Chronotherapy in University Students: Tips from Chronobiology Practicals

Chronobiology is not routinely taught to biology or medical students in most European countries. Here we present the results of the chronobiology practicals of a group of students of the University of Padova, with a view to highlight some interesting features of this group, and to share a potentially interesting cross-faculty teaching experience. Thirty-eight students […]

Related Product: PRO-Diary

Publication Date: January 21, 2021


Shining the Light on the MotionWatch8 Light Sensor for Sleep and Aging Research: What Can We Measure and What Are We Missing?

Background: Poor sleep is common among older adults at risk for dementia and may be due to circadian dysregulation. Light is the most important external stimulus to the circadian clock and bright light therapy (BLT) has been used for >20 years to help realign circadian rhythms. However, the ability of field methods (e.g., actigraphy) to […]

Related Product: MotionWatch

Publication Date: January 20, 2021


The complexity of sleep disorders in dialysis patients

Background Dialysis patients experience a high burden of physical and emotional symptoms directly affecting their sleep and quality of life. In this study, objective and subjective measurements to quantify sleep were performed, compared with those of healthy controls, and associated with burden of comorbidity and uraemic toxicity. Methods A total of 64 dialysis patients were […]

Related Product: MotionWatch

Publication Date: January 19, 2021


Excessive sleepiness in patients with psychosis: An initial investigation

Clinical experience indicates that excessive sleepiness and hypersomnia may be a common issue for patients with psychosis. Excessive sleepiness is typically ascribed to the sedating effects of antipsychotic medications but there may be other potential contributors such as sleep disorders and depression. Furthermore, the impact of excessive sleepiness itself on patients’ symptoms and general wellbeing […]

Related Product: MotionWatch

Publication Date: January 15, 2021


Pharmacokinetics And Clinical Effects Of A Single Oral Dose Of Trazodone In The Domestic Goat (Capra Hircus) As A Model For Wild Ruminants

Trazodone is an antianxiety medication commonly used in human and veterinary medicine. Stress-related trauma is the leading cause of morbidity and mortality in wild ruminant species. Trazodone could reduce stress and allow safer capture and handling, thus having a positive effect on their welfare. The objective of this study was to describe the clinical effects […]

Related Product: Actiwatch Mini

Publication Date: January 12, 2021


Circadian Patterns of Patients with Type 2 Diabetes and Obstructive Sleep Apnea

Sleep apnea, a condition that modifies sleep and circadian rhythms, is highly prevalent in patients with diabetes. However, it is not known if there is an association between sleep apnea, circadian alterations and glycemic regulation in this type of patient. Here, a polysomnographic study was carried out on 21 women and 25 men (mean age […]

Related Product: MotionWatch

Publication Date: January 11, 2021


Sleep, Prospective Memory, and Immune Status among People Living with HIV

Background: Persons living with HIV (PLWH) frequently report sleep complaints, but objective measurements are still lacking regarding sleep continuity, total sleep time per 24 h, and the links with both prospective memory performance and HIV infection parameters. Methods: PLWH (n = 96) and control (n = 96) groups (balanced for gender and age) were monitored […]

Related Product: MotionWatch

Publication Date: January 8, 2021


Measuring Physical Activity Levels During instructional Settings for Children with Autism Spectrum Disorder

A growing number of children with autism spectrum disorder (ASD) may not possess the motor skills needed to be physically active. In order to address these needs, Camp Nugget is held each summer with the goal of providing quality individualized physical activity instruction to children with disabilities 5 through 12 years of age. The program […]

Related Product: Actiheart

Publication Date: January 1, 2021


Physiological Data Models to Understand the Effectiveness of Drone Operation Training in Immersive Virtual Reality

Data collection using unmanned aerial vehicles (UAVs) in construction and heavy civil projects is subject to compliance with strict operational rules and safety regulations. Both the US Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) require drone operators to keep the drone in sight and avoid flying near people or other […]

Related Product: Actiheart

Publication Date: January 1, 2021


Sleep and Activity Patterns Are Altered During Early Critical Illness in Mechanically Ventilated Adults

Background Mechanically ventilated (MV) patients in the intensive care unit (ICU) often experience disturbed sleep and profound inactivity. Objectives The aim of this study was to report 5 consecutive days’ descriptive analyses on sleep efficiency (SE), total sleep time (TST), daytime activity ratio (DAR), and hourly activity counts among critically ill MV adults from 9 […]

Related Product: MotionWatch

Publication Date: January 1, 2021


Feasibility, Reliability, and Validity of the MotionWatch 8 to Evaluate Physical Activity Among Older Adults With and Without Cognitive Impairment in Assisted Living Settings

This study tested the feasibility, reliability, and validity of the MotionWatch 8 among assisted living residents with and without cognitive impairment. Data from the Dissemination and Implementation of Function Focused Care in Assisted Living Using the Evidence Integration Triangle study were used. The sample included 781 individuals from 85 facilities with a mean age of […]

Related Product: MotionWatch

Publication Date: December 25, 2020


Variation in Heart-Rate Profile During a Prolonged, Submaximal Swim Bout

Purpose: To describe the heart-rate (HR) response during a prolonged, submaximal, multirepetition swimming bout (ie, typical early-season swimming training), as there is currently little or no literature on this topic. Methods: A total of 12 collegiate swimmers were instructed to complete sixty 91.4-m (100-yd) freestyle repetitions at their fastest sustainable pace, allowing between 5 and […]

Related Product: Actiheart

Publication Date: December 16, 2020


The acute effects of sleep restriction therapy for insomnia on circadian timing and vigilance

Sleep‐restriction therapy (SRT) has been shown to improve insomnia symptoms by restricting sleep opportunity. Curtailment of time in bed affects the duration and consolidation of sleep, but also its timing. While recent work suggests that people with insomnia are characterised by misalignment between circadian and behavioural timing of sleep, no study has investigated if SRT […]

Related Product: PRO-Diary

Publication Date: December 13, 2020


pyActigraphy: open-source python package for actigraphy data visualisation and analysis

Over the past 40 years, actigraphy has been used to study rest-activity patterns in circadian rhythm and sleep research. Furthermore, considering its simplicity of use, there is a growing interest in the analysis of large population-based samples, using actigraphy. Here, we introduce pyActigraphy, a comprehensive toolbox for data visualization and analysis including multiple sleep detection […]

Related Product: MotionWatch

Publication Date: December 3, 2020


Enhancing daily light exposure increases the antibody response to influenza vaccination in patients with dementia

Enhancing lighting conditions in institutions for individuals with dementia improves their sleep, circadian rhythms and well-being. Here, we tested whether a greater long-term daily light exposure supports the immune response to the annual influenza vaccination. Eighty older institutionalised patients suffering from dementia (54 women and 26 men) continuously wore an activity tracker for 8 weeks […]

Related Product: MotionWatch

Publication Date: December 2, 2020


Sleep− wake cycle dysregulation in idiopathic REM sleep behaviour disorder

Alteration of the circadian sleep−wake rhythm has been suggested in patients affected by idiopathic rapid eye movement sleep behaviour disorder. Because actigraphy is the validated instrument to monitor the sleep−wake cycle, the aim of the present study was to investigate the circadian sleep−wake rhythm in patients with idiopathic rapid eye movement sleep behaviour disorder compared […]

Related Product: MotionWatch

Publication Date: December 1, 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


Day and night changes in energy expenditure of patients on automated peritoneal dialysis

Rationale Automated peritoneal dialysis (APD) treatment for end-stage kidney disease affords patients a degree of autonomy in everyday life. Clinical investigations of their energy expenditure (EE) are usually based on resting EE, which could mask day and night variations in EE. The aim of this study, therefore, was to compare the components of EE in […]

Related Product: Actiheart

Publication Date: November 28, 2020


Cognitive dietary restraint score is associated with lower energy, carbohydrate, fat, and grain intake among female adolescent endurance runners

This cross-sectional study investigated associations between cognitive dietary restraint (CDR), energy, macronutrient and food group intake, menstrual function, and bone density in female adolescent endurance runners. Participants were forty female adolescent endurance runners. The independent variable was CDR, as assessed by the Three Factor Eating Questionnaire (TFEQ). Runners with CDR subscale scores ≥11 were classified […]

Related Product: Actiheart

Publication Date: November 25, 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


Cardiovascular responses to stress utilizing anticipatory singing tasks

Models of psychobiological stress reactivity have a foundation in the measurement of responses to standardized stress tasks. Tasks with anticipatory phases have been proposed as an effective method of stress induction, either as a stand-alone task or replacement constituent elements for existing stressor paradigms. Tasks utilizing singing as a primary stressor have been proposed but […]

Related Product: Actiheart

Publication Date: November 16, 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


The relationship of sleep duration and quality to energy expenditure and physical activity in children

Background Shorter sleep duration has been linked to the risk for obesity in children. The pathways linking sleep duration and quality to the risk of obesity are unclear, particularly the effect of sleep on energetics. Objective We investigated the relationship between sleep duration, quality and timing in children, to the basal metabolic rate (BMR), total […]

Related Product: Actiheart

Publication Date: November 15, 2020


Effects of Inspiratory Muscle Training on Heart Rate Variability in Children with Cystic Fibrosis: A Pilot Study

Purpose Cystic Fibrosis (CF) is a multisystem disease associated with symptoms such as dyspnoea, tachycardia and tachypnea that may be related to changes in autonomic function and sensitive to improvement following inspiratory muscle training (IMT). The aim of the present study was to investigate the effect of IMT on heart rate variability (HRV) and respiratory […]

Related Product: Actiheart

Publication Date: November 9, 2020


Cardiorespiratory fitness, occupational aerobic workload and age: workplace measurements among blue-collar workers

Background The knowledge, from laboratory studies dating back to the 1950s on the importance of the association between cardiorespiratory fitness and aerobic workload for workers health, is fundamental for promoting sustainable healthy employability among ageing blue-collar workers today. However, the association between cardiorespiratory fitness and aerobic workload has not yet been documented during daily work, […]

Related Product: Actiheart

Publication Date: November 8, 2020


From Dawn to Dusk–Mimicking Natural Daylight Exposure Improves Circadian Rhythm Entrainment in Patients with Severe Brain Injury

Background: Better integrity of circadian rhythms has been shown to relate to a richer behavioral repertoire in patients with disorders of consciousness (DOC). As light exposure has proven successful in treating circadian rhythm disorders, we sought to investigate whether simulating natural daylight in a clinical setting can entrain circadian rhythms in patients with DOC, and […]

Related Product: MotionWatch

Publication Date: November 2, 2020


Testing the Implementation of Function-focused Care in Assisted Living Settings

Objectives The purpose of this study was to evaluate the Function-Focused Care for Assisted Living Using the Evidence Integration Triangle (FFC-AL-EIT) intervention. Design FFC-AL-EIT was a randomized controlled pragmatic trial including 85 sites and 794 residents. Intervention FFC-AL-EIT was implemented by a Research Nurse Facilitator working with a facility champion and stakeholder team for 12 […]

Related Product: MotionWatch

Publication Date: October 31, 2020


Physiological Data Models to Understand the Effectiveness of Drone Operation Training in Immersive Virtual Reality

Data collection using unmanned aerial vehicles (UAVs) in construction and heavy civil projects is subject to compliance with strict operational rules and safety regulations. Both the US Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) require drone operators to keep the drone in sight and avoid flying near people or other […]

Related Product: Actiheart

Publication Date: October 29, 2020


The Psychological and Physiological Consequences of Low Energy Availability in a Male Combat Sport Athlete

Purpose: To evaluate the effects of low energy availability (EA) on health and performance indices associated with the Male Athlete Triad and Relative Energy Deficiency in Sports (RED-S) models. Methods: Over an 8 week period, a male combat sport athlete adhered to a phased body mass (BM) loss plan consisting of 7 weeks energy intake […]

Related Product: Actiheart

Publication Date: October 22, 2020


Towards a Closed-Loop Neurostimulation Platform for Augmenting Operator Vigilance

Vigilance is a primary job-performance requirement for human operators in domains that demand sustained attention, including air traffic control (ATC), surveillance, emergency response and many others. In this pilot study we introduce the prerequisites and conditions that facilitate a novel closed-loop, adaptive neurostimulation system to alleviate vigilance decrements during prolonged time-on-task efforts. Here, we investigate […]

Related Product: Actiheart

Publication Date: October 11, 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


The influence of low-intensity resistance training combined with neuromuscular electrical stimulation on autonomic activity in healthy adults: A randomized controlled cross-over trial

Background: Low-intensity resistance training (RT) combined with neuromuscular electrical stimulation (NMES) is one method of exercise to improve the deterioration of physical function. However, it is unclear whether low-intensity RT combined with NMES (RT + NMES) can be safely implemented. Objective: This study aimed to examine the influence of low-intensity RT + NMES on autonomic […]

Related Product: Actiheart

Publication Date: September 30, 2020


Effect of vestibular stimulation using a rotatory chair in human rest/activity rhythm

The vestibular system is responsible for sensing every angular and linear head acceleration, mainly during periods of motor activity. Previous animal and human experiments have shown biological rhythm disruptions in small rodents exposed to a hypergravity environment, but also in patients with bilateral vestibular loss compared to a control population. This raised the hypothesis of […]

Related Product: MotionWatch

Publication Date: September 26, 2020


Timed physical exercise does not influence circadian rhythms and glucose tolerance in rotating night shift workers: The EuRhythDia study

Objectives: Night shift workers are at cardiometabolic risk due to circadian misalignment. We investigated whether infrequent exercise before each night shift that intentionally would not improve physical performance improves glucose tolerance and 24-h blood pressure profiles and synchronizes circadian rhythms of melatonin and cortisol in rotating night shift workers. Methods: A total of 24 rotating […]

Related Product: MotionWatch

Publication Date: September 25, 2020


A phase 2a randomised, double-blind, placebo-controlled, parallel-group, add-on clinical trial of ebselen (SPI-1005) as a novel treatment for mania or hypomania

Rationale Lithium is an effective prophylactic and anti-manic treatment in bipolar disorder; however, its use is declining through perceived poor tolerance and toxicity. Lithium inhibits inositol monophosphatase (IMPase), a probable key therapeutic mechanism. The anti-inflammatory drug, ebselen, also inhibits IMPase and appears well-tolerated and safe. Objectives To assess the efficacy of adjunctive ebselen in mania […]

Related Product: MotionWatch

Publication Date: September 9, 2020


Test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities

The current study determined the test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities. Before filling in the Adapted-SQUASH twice with a recall period of two weeks, participants wore the Actiheart activity monitor up to one week. For the test-retest reliability (N=68), Intraclass correlation […]

Related Product: Actiheart

Publication Date: September 9, 2020


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