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 106 Results

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

Physical activity volume and intensity distribution in relation to bone, lean and fat mass in children

Considering physical activity (PA) volume and intensity may provide novel insights into the relationships of PA with bone, lean, and fat mass. This study aimed to assess the associations of PA volume, PA intensity distribution, including moderate-to-vigorous PA (MVPA) with total-body-less-head bone mineral content (BMC), lean, and fat mass in children. A population sample of […]

Related Product: Actiheart

Publication Date: November 3, 2022

Effects of pre-meal whey protein consumption on acute food intake and energy balance over a 48-hour period

The effects of pre-meal whey protein consumption on acute food intake and subsequent energy balance measured over 48-h was investigated in males of healthy-weight (HW) or living with overweight and obesity (OV/OB). On two separate trial days, following a controlled breakfast (09:00) and lunch (13:00), 12 HW and 12 OV/OB males consumed either whey protein […]

Related Product: Actiheart

Publication Date: October 27, 2022

The association between sleep duration and detailed measures of obesity: A cross sectional analysis in the ADDITION‐PRO study

Background Sleep duration is associated with BMI and waist circumference. However, less is known about whether sleep duration affects different measurements of obesity differently. Objective To investigate the association between sleep duration and different measures of obesity. Methods In this cross-sectional analysis 1309, Danish, older adults (55% men) completed at least three days of wearing […]

Related Product: Actiheart

Publication Date: September 16, 2022

The Role of Sleep and Eating Patterns in Adiposity Gain among Preschool-Aged Children

Background Short sleep duration is related to risk for obesity in preschool children. However, the underlying mechanism(s) are not clear. Objective We evaluated the relationship between sleep characteristics with body composition, energetics and weight-regulating behaviors in preschool-aged children; and the longitudinal associations between children’s sleep and eating patterns with body composition at 1-year follow-up. Methods […]

Related Product: Actiheart

Publication Date: July 14, 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

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

Obesity due to Steroid Receptor Coactivator-1 deficiency is associated with endocrine and metabolic abnormalities

Context Genetic variants affecting the nuclear hormone receptor coactivator Steroid Receptor Coactivator, SRC-1, have been identified in people with severe obesity and impair melanocortin signaling in cells and mice. As a result, obese patients with SRC-1 deficiency are being treated with a Melanocortin 4 receptor agonist in clinical trials. Objective Here, our aim was to […]

Related Product: Actiheart

Publication Date: February 8, 2022

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

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

Related Product: MotionWatch

Publication Date: August 20, 2021

Effects of gastric bypass surgery on the brain; simultaneous assessment of glucose uptake, blood flow, neural activity and cognitive function during normo-and hypoglycemia

While Roux-en-Y Gastric Bypass (RYGB) surgery in obese individuals typically improves glycemic control and prevents diabetes, it also frequently causes hypoglycemia. Previous work showed attenuated counter-regulatory responses following RYGB. The underlying mechanisms as well as the clinical consequences are unclear.In this study, 11 non-diabetic subjects with severe obesity were investigated pre- and post-RYGB during hyperinsulinemic […]

Related Product: Actiheart

Publication Date: March 4, 2021

Associations of physical activity, sedentary time, and diet quality with biomarkers of inflammation in children

We investigated the associations of physical activity (PA), sedentary time (ST), and diet quality with biomarkers of inflammation in 390 children (192 girls, 198 boys) aged 6–8 years. PA energy expenditure (PAEE), light PA, moderate PA (MPA), vigorous PA (VPA), moderate-to-vigorous PA (MVPA), and ST were assessed by combined movement and heart rate sensor. Finnish […]

Related Product: Actiheart

Publication Date: February 19, 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

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

Infusion of donor feces affects the gut-brain axis in humans with metabolic syndrome

Objectives Increasing evidence indicates that intestinal microbiota play a role in diverse metabolic processes via intestinal butyrate production. Human bariatric surgery data suggest that the gut-brain axis is also involved in this process, but the underlying mechanisms remain unknown. Design We compared the effect of fecal microbiota transfer (FMT) from post-Roux-en-Y gastric bypass (RYGB) donors […]

Related Product: Actiheart

Publication Date: July 3, 2020

Effect of Plain Versus Sugar‐Sweetened Breakfast on Energy Balance and Metabolic Health

Objective This study investigated the effect of 3 weeks of high‐sugar (“Sweet”) versus low‐sugar (“Plain”) breakfast on energy balance, metabolic health, and appetite. Methods A total of 29 healthy adults (22 women) completed this randomized crossover study. Participants had pre‐ and postintervention appetite, health, and body mass outcomes measured, and they recorded diet, appetite (visual […]

Related Product: Actiheart

Publication Date: February 28, 2020

Child-related and parental predictors for thelarche in a general population of girls: the PANIC study

Background Obesity has been associated with earlier thelarche, whereas other predictors for it remain unclear. Methods We studied child-related and parental predictors for earlier thelarche in 195 girls aged 6–8 years followed up for 2 years. A physician evaluated breast development by inspection and palpation. Body fat percentage (BF%) was measured by dual-energy X-ray absorptiometry, […]

Related Product: Actiheart

Publication Date: February 20, 2020

Lipid metabolism links nutrient-exercise timing to insulin sensitivity in men classified as overweight or obese

Context Pre-exercise nutrient availability alters acute metabolic responses to exercise, which could modulate training responsiveness. Objective To assess acute and chronic effects of exercise performed before versus after nutrient ingestion on whole-body and intramuscular lipid utilization and postprandial glucose metabolism. Design (1) Acute, randomized, crossover design (Acute Study); (2) 6-week, randomized, controlled design (Training Study). […]

Related Product: Actiheart

Publication Date: January 30, 2020

Champ4life Study Protocol: A One-Year Randomized Controlled Trial of a Lifestyle Intervention for Inactive Former Elite Athletes with Overweight/Obesity

Preventive and educational programs directed to former elite athletes in the areas of healthy living are required. This is particularly relevant as obesity and health-related problems are observed in retired athletes, especially in those whose current levels of physical activity are below the recommendations. During their sports career, elite athletes are supported by a multidisciplinary […]

Related Product: Actiheart

Publication Date: January 21, 2020

Fundamental Movement Skill Approach to Combat Childhood Obesity in Surabaya, Indonesia: Potential Effects of Video Games Based Exercises (Exergaming)

The study aims to observe the effect of moderate intensity exergaming on mastering of fundamental movement skill and reduction in body mass index (BMI) in overweight and obese children in Surabaya, Indonesia. The participants were 17 primary school students, aged 6-12 years. All participants had a BMI above percentile 85 (overweight and obese) and performed […]

Related Product: Actiheart

Publication Date: January 1, 2020

How many calories do nurses burn at work? A real-time study of nurses’ energy expenditure

Background Nurses have high rates of overweight and obesity, and physical inactivity is one key determinant of weight gain. Aims The present study aims to quantify nurses’ energy expenditure over a standard 12-hour shift to establish whether activity levels at work are too low to maintain a healthy body weight. Methods Ward-based nurses (n = 96, 90 […]

Related Product: Actiheart

Publication Date: November 1, 2019

Development of an eating topography protocol and an investigation of its effects on body composition, appetite and mindfulness

Eating rate (ER) is part of the microstructure of meal ingestion and has been of increasing scientific interest due to manipulations being implicated in energy intake, appetite control and mindfulness. The current thesis aims to develop and test the slow eating rate (SER) protocol for use in overweight-free living adults and to investigate the protocol’s […]

Related Product: PRO-Diary

Publication Date: September 30, 2019

Combined GLP-1, oxyntomodulin, and peptide YY improves body weight and glycemia in obesity and prediabetes/type 2 diabetes: a randomized, single-blinded, placebo-controlled study

OBJECTIVE Roux-en-Y gastric bypass (RYGB) augments postprandial secretion of glucagon-like peptide 1 (GLP-1), oxyntomodulin (OXM), and peptide YY (PYY). Subcutaneous infusion of these hormones (“GOP”), mimicking postprandial levels, reduces energy intake. Our objective was to study the effects of GOP on glycemia and body weight when given for 4 weeks to patients with diabetes and […]

Related Product: Actiheart

Publication Date: July 27, 2019

Tracking snacking in real time: Time to look at individualised patterns of behaviour

Background: Identifying when and where people overeat is important for intervention design, yet little is known about how unhealthy behaviours unfold in real life. Aim: To track the activities, social contexts and locations that co-occur with unhealthy snacking. Methods: Sixty-four adults (49F, mean age = 38.6 years) used electronic diaries to record snacking, location, social […]

Related Product: PRO-Diary

Publication Date: July 26, 2019

Objectively assessed physical activity and weight status of primary school children in Germany with and without migration backgrounds. Public health

Objectives Many children are insufficiently active, and children with a migration background appear to be even less active and at a higher risk of developing obesity. This study evaluated the weight status, and the frequencies and intensities of objectively assessed physical activity (PA) of children with and without a migration background. Study design Cross-sectional study. […]

Related Product: Actiheart

Publication Date: June 27, 2019

Decreased lipogenesis-promoting factors in adipose tissue in postmenopausal women with overweight on a Paleolithic-type diet

Purpose We studied effects of diet-induced postmenopausal weight loss on gene expression and activity of proteins involved in lipogenesis and lipolysis in adipose tissue. Methods Fifty-eight postmenopausal women with overweight (BMI 32.5 ± 5.5) were randomized to eat an ad libitum Paleolithic-type diet (PD) aiming for a high intake of protein and unsaturated fatty acids or a […]

Related Product: Actiheart

Publication Date: December 1, 2018

Ovarian estradiol supports sexual behavior but not energy homeostasis in female marmoset monkeys

Objective In adult female rodents, ovarian estradiol (E2) regulates body weight, adiposity, energy balance, physical activity, glucose-insulin homeodynamics, and lipid metabolism, while protecting against diet-induced obesity. The same E2 actions are presumed to occur in primates, but confirmatory studies have been lacking. Methods We investigated the consequences of ovariectomy (OVX) and E2 replacement in female […]

Related Product: Actiwatch Mini

Publication Date: July 18, 2018

Dietary sodium intake and its relationship to adiposity in young black and white adults: The African‐PREDICT study

Obesity and salt intake are both established factors contributing to cardiovascular disease development. Recently, studies found a controversial positive relationship between dietary salt and obesity. Therefore, the authors investigated whether obesity‐related measures are associated with 24‐hour urinary sodium in a healthy biethnic population. The study included 761 adults (20‐30 years) with complete 24‐hour urinary sodium, […]

Related Product: Actiheart

Publication Date: July 1, 2018

Self-reported physical activity is not a valid method for measuring physical activity in 15-year-old South African boys and girls

Physical activity plays an important role in the prevention of chronic lifestyle-related diseases. The development of valid instruments for the assessment of physical activity remains a challenge in field studies. The purpose of the present study was therefore to determine the level of agreement between physical activity objectively measured by the ActiHeart® (Cambridge Neurotechnology Ltd, […]

Related Product: Actiheart

Publication Date: June 6, 2018

Physical Activity in Pre-school Children: Role of the Teacher during Free Play

It has become evident over the past decade that the lack of PA (physical activity) is a major concern for the population at large CDC (Center for Disease Control). This lack is a major reason for the increase in overweight and obese children (USDHHS, 2014). The CDC and the American Heart Association recommend children need […]

Related Product: Actiheart

Publication Date: June 1, 2018

A heterogeneous response of liver and skeletal muscle fat to the combination of a Paleolithic diet and exercise in obese individuals with type 2 diabetes: a randomised controlled trial

Aims/hypothesis The aim of the study was to investigate ectopic fat deposition and insulin sensitivity, in a parallel single-blinded randomised controlled trial, comparing Paleolithic diet alone with the combination of Paleolithic diet and exercise in individuals with type 2 diabetes. Methods Thirty-two individuals with type 2 diabetes with BMI 25–40 kg/m2 and 30–70 years of […]

Related Product: Actiheart

Publication Date: April 26, 2018

Mediating effects of motor performance, cardiorespiratory fitness, physical activity, and sedentary behaviour on the associations of adiposity and other cardiometabolic risk factors with academic achievement in children

We investigated the associations of cardiometabolic risk factors with academic achievement and whether motor performance, cardiorespiratory fitness, physical activity, or sedentary behaviour mediated these associations. Altogether 175 children 6–8 years-of-age participated in the study. We assessed body fat percentage (BF%), waist circumference, insulin, glucose, triglycerides, HDL cholesterol, and systolic and diastolic blood pressure, leptin, alanine […]

Related Product: Actiheart

Publication Date: March 9, 2018

Sleep extension is a feasible lifestyle intervention in free-living adults who are habitually short sleepers: a potential strategy for decreasing intake of free sugars? A randomized controlled pilot study

Background Evidence suggests that short sleep duration may be a newly identified modifiable risk factor for obesity, yet there is a paucity of studies to investigate this. Objective We assessed the feasibility of a personalized sleep extension protocol in adults aged 18–64 y who are habitually short sleepers (5 to <7 h), with sleep primarily […]

Related Product: MotionWatch

Publication Date: January 10, 2018

Associations of active commuting with body fat and visceral adipose tissue: a cross-sectional population based study in the UK

The promotion of active travel (walking and cycling) is one promising approach to prevent the development of obesity and related cardio-metabolic disease. However the associations between active travel and adiposity remain uncertain. We used the Fenland study (a population based-cohort study; Cambridgeshire, UK, 2005–15) to describe the association of commuting means with DEXA measured body […]

Related Product: Actiheart

Publication Date: January 1, 2018

Rest-activity circadian rhythm and sleep quality in patients with binge eating disorder

Recent findings suggest that altered rest-activity circadian rhythms (RARs) are associated with a compromised health status. RARs abnormalities have been observed also in several pathological conditions, such as cardiovascular, neurological, and cancer diseases. Binge eating disorder (BED) is the most common eating disorder, with a prevalence of 3.5% in women and 2% in men. BED […]

Related Product: MotionWatch

Publication Date: November 16, 2017

Characterization of skin function associated with obesity and specific correlation to local/systemic parameters in American women

Background Obesity is considered problematic not only as a major cause of diabetes, hypertension, and dyslipidemia, but also as a risk of intractable dermatosis; however influence of obesity on skin function has not been clarified. To clarify the mechanism of obesity-associated skin disorders, we aimed to characterize the skin function of subjects with obesity, and […]

Related Product: Actiheart

Publication Date: November 13, 2017

Subjectively and objectively assessed social and physical environmental correlates of preschoolers’ accelerometer-based physical activity

Background Overweight and low levels of physical activity (PA) in preschoolers are major public health concerns. However, to date only few studies have investigated subjective and objective correlates of PA across different socioecological domains in preschoolers. We therefore simultaneously investigate associations between preschoolers’ objectively measured leisure-time PA and a comprehensive set of subjective and objective […]

Related Product: Actiheart

Publication Date: November 7, 2017

Interplay of socioeconomic status and supermarket distance is associated with excess obesity risk: a UK cross-sectional study

U.S. policy initiatives have sought to improve health through attracting neighborhood supermarket investment. Little evidence exists to suggest that these policies will be effective, in particular where there are socioeconomic barriers to healthy eating. We measured the independent associations and combined interplay of supermarket access and socioeconomic status with obesity. Using data on 9702 UK […]

Related Product: Actiheart

Publication Date: October 25, 2017

Sedentary time among primary school children in south-West Germany: amounts and correlates

Background Sedentary behaviour in children is related to different health consequences such as overweight and cardio-metabolic diseases that can track into adulthood. Previous studies have shown that children spend hours being sedentary, but no data of sedentary time (ST) among German children has been available, yet. Therefore, this study investigated objectively measured amounts and correlates […]

Related Product: Actiheart

Publication Date: October 12, 2017

Validation of MotionWatch8 accelerometer intensity cutpoints in children

Objective. Excess body weight in children has become a serious public health concern worldwide. The Centers for Disease Control and Prevention (CDC) demonstrated that childhood obesity has tripled since the 1970s in the United States. To prevent childhood obesity, the CDC recommends that children achieve 60 minutes of moderate to vigorous physical activity each day. […]

Related Product: MotionWatch

Publication Date: June 1, 2017

Ramadan model of intermittent fasting for 28 d had no major effect on body composition, glucose metabolism, or cognitive functions in healthy lean men

Objectives There has been a parallel increase in the incidence of obesity and diabetes as well as the number of daily meals. However, evidence is lacking regarding the role of intermittent fasting. The aim of this study was to determine the effects of a Ramadan model of intermittent fasting (RIF; 14 h of daytime abstinence […]

Related Product: Actiheart

Publication Date: May 1, 2017

Relationship between volition, physical activity and weight loss maintenance: Study rationale, design, methods and baseline characteristics

Aims: To investigate the relationship between volition, physical activity and weight loss maintenance. Methods: We recruited 84 sedentary (maximal oxygen uptake: 25 ± 5 ml/min), overweight and obese (Body mass index (BMI) 38 ± 7 m/h2, fat 44 ± 7 %) women ( n = 55) and men ( n = 29) for an interdisciplinary […]

Related Product: Actiheart

Publication Date: May 1, 2017

Attenuated Low‐Grade Inflammation Following Long‐Term Dietary Intervention in Postmenopausal Women with Obesity

Objective Abdominal fat accumulation after menopause is associated with low‐grade inflammation and increased risk of metabolic disorders. Effective long‐term lifestyle treatment is therefore needed. Methods Seventy healthy postmenopausal women (age 60 ± 5.6 years) with BMI 32.5 ± 5.5 were randomized to a Paleolithic‐type diet (PD) or a prudent control diet (CD) for 24 months. Blood samples and fat […]

Related Product: Actiheart

Publication Date: April 25, 2017

Relationship between physical activity, body fatness and cardiorespiratory fitness in South African adolescents: The PAHL Study

Low cardiorespiratory fitness and inactivity are strong health predictors associated with excessive fatness. The objective of this study was to determine the associations between physical activity (PA) and cardiorespiratory fitness and body fatness in South African adolescents. A cross-sectional study was performed with a subsample of 149 school-going adolescents (58 boys and 91 girls) with […]

Related Product: Actiheart

Publication Date: March 2, 2017

Exploring childhood obesity prevention among diverse ethnic groups in schools and places of worship: recruitment, acceptability and feasibility of data collection and intervention components

Small-scale, detailed exploration of the recruitment, assessment, and evaluation processes of obesity intervention among minority ethnic children. The study took place in schools and places of worship during 2008–2010 in London, UK. Measures included 3-day food diaries, 24 h dietary recalls, the Youth Physical Activity Questionnaire, accelerometry, and diet and physical activity self-efficacy questionnaires. Potential […]

Related Product: Actiheart

Publication Date: February 24, 2017

Design, Implementation, and Study Protocol of a Kindergarten-Based Health Promotion Intervention

Inactivity and an unhealthy diet amongst others have led to an increased prevalence of overweight and obesity even in young children. Since most health behaviours develop during childhood health promotion has to start early. The setting kindergarten has been shown as ideal for such interventions. “Join the Healthy Boat” is a kindergarten-based health promotion programme […]

Related Product: Actiheart

Publication Date: February 20, 2017

Obesity history and daily patterns of physical activity at age 60–64 years: findings from the MRC National Survey of Health and Development.

Background The aim of this study was to investigate associations of current body mass index (BMI) and obesity history with daily patterns of physical activity. Methods At age 60–64, participants from a British birth cohort study wore accelerometers for 5 days. Accelerometry counts were log-transformed and mean log-counts were used to derive a summary variable […]

Related Product: Actiheart

Publication Date: February 18, 2017

Usefulness of motion sensors to estimate energy expenditure in children and adults: a narrative review of studies using DLW

It is well documented that meeting moderate-to-vigorous physical activity guidelines of 150 min per week is protective against chronic disease, and this is likely explained by higher energy expenditure (EE). In opposition, sedentary behavior (low EE) seems to impair health outcomes. There are gold standard methods to measure EE such as the doubly labeled water (DLW) […]

Related Product: Actiheart

Publication Date: February 1, 2017

Ethnic differences in anthropometric measures and abdominal fat distribution: a cross-sectional pooled study in Inuit, Africans and Europeans.

Background Ethnic variation in abdominal fat distribution may explain differences in cardiometabolic risk between populations. However, the ability of anthropometric measures to quantify abdominal fat is not clearly understood across ethnic groups. The aim of this study was to investigate the associations between anthropometric measures and visceral (VAT) and subcutaneous abdominal adipose tissue (SAT) in […]

Related Product: Actiheart

Publication Date: January 13, 2017

Physical activity of German children during different segments of the school day

Aim This study objectively investigated the amount and intensity of German primary school children’s physical activity (PA) during different segments of the school day and explored the contribution of physical education (PE) and break times to daily moderate to vigorous PA (MVPA). Subject and methods PA of 294 children (7.1 ± 0.7 years, 48 % […]

Related Product: Actiheart

Publication Date: January 1, 2017

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