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 80 Results

Associations of contemporaneous bmi and obesity history with daily patterns of physical activity at age 60–64 years

Background Links between physical activity and body mass index (BMI) are well-recognised. However, the evidence used to quantify this relationship and inform physical activity guidelines is largely based on self-reported activity data. This usually captures specific types of moderate to vigorous activity, less commonly undertaken at older ages, and is subject to reporting bias. In […]

Related Product: Actiheart

Publication Date: August 31, 2015

Objectively measured physical activity and longitudinal changes in adolescent body fatness: an observational cohort study

Background The data regarding prospective associations between physical activity (PA) and adiposity in youth are inconsistent. Objective The objective of this study was to investigate associations between baseline levels of objectively measured PA and changes in adiposity over 2.5 years from mid‐to‐late adolescence. Methods This was an observational cohort study in 728 school students (43% […]

Related Product: Actiheart

Publication Date: May 27, 2015

A cluster-randomised controlled trial to assess the effectiveness and cost-effectiveness of a childhood obesity prevention programme delivered through schools, targeting 6–7 year old children: the WAVES study protocol

Background There is some evidence that school-based interventions are effective in preventing childhood obesity. However, longer term outcomes, equity of effects and cost-effectiveness of interventions have not been assessed. The aim of this trial is to assess the clinical and cost-effectiveness of a multi-component intervention programme targeting the school and family environment through primary schools, […]

Related Product: Actiheart

Publication Date: May 13, 2015

Skeletal muscle ceramide species in men with abdominal obesity

Obesity is a risk factor for diabetes and its consequences, including accelerated ageing and mortality. The underlying factor could be accumulation of certain lipid moieties, such as ceramides (CER) and diacylgycerol (DAG) within muscle tissue, which are known to promote insulin resistance (IR), induce inflammation and oxidative injury, ultimately altering muscle function. Aim First, to […]

Related Product: Actiheart

Publication Date: April 1, 2015

Controlled exposure to particulate matter from urban street air is associated with decreased vasodilation and heart rate variability in overweight and older adults

Background Exposure to particulate matter (PM) is generally associated with elevated risk of cardiovascular morbidity and mortality. Elderly and obese subjects may be particularly susceptible, although short-term effects are poorly described. Methods Sixty healthy subjects (25 males, 35 females, age 55 to 83 years, body mass index > 25 kg/m2) were included in a cross-over study with […]

Related Product: Actiheart

Publication Date: March 19, 2015

Energetic adaptations persist after bariatric surgery in severely obese adolescents

Objective Energetic adaptations induced by bariatric surgery have not been studied in adolescents or for extended periods postsurgery. Energetic, metabolic, and neuroendocrine responses to Roux‐en‐Y gastric bypass (RYGB) surgery were investigated in extremely obese adolescents. Methods At baseline and at 1.5, 6, and 12 months post‐baseline, 24‐h room calorimetry, body composition, and fasting blood biochemistries […]

Related Product: Actiheart

Publication Date: February 24, 2015

Does a higher incidence of break times in primary schools result in children being more physically active?

BACKGROUND Regular physical activity (PA) has multiple benefits to health; however, the majority of schoolchildren do not reach PA guidelines of 60 minutes of moderate to vigorous PA (MVPA) daily. During the school day, break times are often the only opportunity for children to be physically active. This study investigated PA levels during school breaks […]

Related Product: Actiheart

Publication Date: January 21, 2015

Physical activity monitoring in extremely obese adolescents from the Teen-LABS study

Background The accuracy of physical activity (PA) monitors to discriminate between PA, sedentary behavior, and non-wear in extremely obese (EO) adolescents is unknown. Methods Twenty-five subjects (9 male/16 female; age=16.5±2.0 y; BMI=51±8 kg/m2) wore three activity monitors (StepWatch [SAM], Actical [AC], Actiheart [AH]) during a 400 meter walk test (400MWT), two standardized PA bouts of […]

Related Product: Actiheart

Publication Date: January 12, 2015

Effects of physical education on objectively determined physical activity in primary school children—which proportioning is best?

Physical Education (PE) can foster regular physical activity (PA) in children. However, children engage in insufficient moderate to vigorous PA (MVPA) during PE. This study objectively investigated MVPA of children during a single, compared with double PE-period. In 294 children (7.1 ± 0.7 years) PA was objectively assessed. PE periods were determined and PA was […]

Related Product: Actiheart

Publication Date: January 1, 2015

Linking diet, physical activity, cardiorespiratory fitness and obesity to serum metabolite networks: findings from a population-based study

Objective: It is not yet resolved how lifestyle factors and intermediate phenotypes interrelate with metabolic pathways. We aimed to investigate the associations between diet, physical activity, cardiorespiratory fitness and obesity with serum metabolite networks in a population-based study. Methods: The present study included 2380 participants of a randomly drawn subcohort of the European Prospective Investigation […]

Related Product: Actiheart

Publication Date: November 1, 2014

Associations between sleep and memory in a clinical sample of obese children and adolescents

Today more than one third of U. S. children and adolescents are classified as overweight or obese. While interventions have produced short term improvements in weight status, treatment effects are infrequently maintained. Standard interventions may not be well-suited for the cognitive profile associated with obesity, which is characterized by impaired executive functioning. The literature on […]

Related Product: MotionWatch

Publication Date: September 5, 2014

Specific appetite, energetic and metabolomics responses to fat overfeeding in resistant-to-bodyweight-gain constitutional thinness

Background: Contrasting with obesity, constitutional thinness (CT) is a rare condition of natural low bodyweight. CT exhibits preserved menstruation in females, no biological marker of undernutrition, no eating disorders but a bodyweight gain desire. Anorexigenic hormonal profile with high peptide tyrosine tyrosine (PYY) was shown in circadian profile. CT could be considered as the opposite […]

Related Product: Actiheart

Publication Date: July 14, 2014

Energy expenditure in physical activity of pre-school children measured by means of ActiHeart sensors

ActiHeart®© movement sensors used for measuring physical activity integrate records of cardiac frequency with those obtained by accelerometry from displacement, while disregarding wrong values that can be separately generated by either method. ActiHeart sensors®© were used for measuring daily energy expenditure of 56 pre-school children (Girls: 62.5%; Age: 5.9 ± 0.3 years) every 15 seconds […]

Related Product: Actiheart

Publication Date: June 1, 2014

National Survey of Health and Development Scientific and Data Collection Team. Physical activity across adulthood in relation to fat and lean body mass in early old age: findings from the Medical Research Council National Survey of Health and Development, 1946–2010

Fat and lean body mass have important implications for health and physical functioning in older age, and physical activity is purported to be an important modifiable determinant. However, our evidence-based understanding of its role is limited. We examined the associations of physical activity, assessed both by self-report (using data on leisure time physical activity (LTPA) […]

Related Product: Actiheart

Publication Date: May 15, 2014

Physical activity and sedentary behaviour in relation to cardiometabolic risk in children: cross-sectional findings from the Physical Activity and Nutrition in Children (PANIC) Study

Background Lower levels of physical activity (PA) and sedentary behaviour (SB) have been associated with increased cardiometabolic risk among children. However, little is known about the independent and combined associations of PA and SB as well as different types of these behaviours with cardiometabolic risk in children. We therefore investigated these relationships among children. Methods […]

Related Product: Actiheart

Publication Date: April 26, 2014

Preventing childhood obesity, phase II feasibility study focusing on South Asians: BEACHeS

Objective To assess feasibility and acceptability of a multifaceted, culturally appropriate intervention for preventing obesity in South Asian children, and to obtain data to inform sample size for a definitive trial. Design Phase II feasibility study of a complex intervention. Setting 8 primary schools in inner city Birmingham, UK, within populations that are predominantly South […]

Related Product: Actiheart

Publication Date: April 10, 2014

Is there spontaneous energy expenditure compensation in response to intensive exercise in obese youth?

Background Physical activity is mainly used in weight control strategies to favour energy expenditure. Some evidence suggests that exercise might not have the expected impact on energy balance, and may actually cause a decrease in the subsequent physical activity energy expenditure. Objective To question the impact of an acute exercise session of varying intensities on […]

Related Product: Actiheart

Publication Date: April 1, 2014

Associations between exposure to takeaway food outlets, takeaway food consumption, and body weight in Cambridgeshire, UK: population based, cross sectional study

Objectives To examine the association between environmental exposure to takeaway food outlets, takeaway food consumption, and body weight, while accounting for home, work place, and commuting route environments. Design Population based, cross sectional study, using data on individual participants’ diet and weight, and objective metrics of food environment exposure. Participants Working adults participating in the […]

Related Product: Actiheart

Publication Date: March 13, 2014

Lower resting and total energy expenditure in postmenopausal compared with premenopausal women matched for abdominal obesity

Abstract The menopause is accompanied by increased risk of obesity, altered body fat distribution and decreased skeletal muscle mass. The resulting decrease in RMR should be accompanied by a compensatory change in energy balance to avoid weight gain. We aimed to investigate habitual energy intake and expenditure in pre- and postmenopausal women matched for abdominal […]

Related Product: Actiheart

Publication Date: February 13, 2014

Associations between children’s independent mobility and physical activity

Background Independent mobility describes the freedom of children to travel and play in public spaces without adult supervision. The potential benefits for children are significant such as social interactions with peers, spatial and traffic safety skills and increased physical activity. Yet, the health benefits of independent mobility, particularly on physical activity accumulation, are largely unexplored. […]

Related Product: Actiheart

Publication Date: January 29, 2014

Long-term effects of a Palaeolithic-type diet in obese postmenopausal women: a 2-year randomized trial

Background/Objectives: Short-term studies have suggested beneficial effects of a Palaeolithic-type diet (PD) on body weight and metabolic balance. We now report the long-term effects of a PD on anthropometric measurements and metabolic balance in obese postmenopausal women, in comparison with a diet according to the Nordic Nutrition Recommendations (NNR). Subjects/Methods: Seventy obese postmenopausal women (mean […]

Related Product: Actiheart

Publication Date: January 29, 2014

Guide to the assessment of physical activity: clinical and research applications: a scientific statement from the American Heart Association

The deleterious health consequences of physical inactivity are vast, and they are of paramount clinical and research importance. Risk identification, benchmarks, efficacy, and evaluation of physical activity behavior change initiatives for clinicians and researchers all require a clear understanding of how to assess physical activity. In the present report, we have provided a clear rationale […]

Related Product: Actiheart

Publication Date: October 14, 2013

Objectively determined physical activity levels of primary school children in south-west Germany

Background Only a small proportion of children and adolescents meet current recommendations of at least 60 min of moderate to vigorous physical activity (MVPA) daily. Most of the available data, however, relies on subjective reports; there is limited objective data on physical activity (PA) levels in German primary school children. The purpose of this study, […]

Related Product: Actiheart

Publication Date: September 28, 2013

Correlates of light and moderate-to-vigorous objectively measured physical activity in four-year-old children

Background Correlates of physical activity (PA) are hypothesized to be context and behaviour specific, but there is limited evidence of this in young children. The aim of the current study is to investigate associations between personal, social and environmental factors and objectively measured light and moderate-to-vigorous PA (LPA and MVPA, respectively) in four-year-old children. Methods […]

Related Product: Actiheart

Publication Date: September 5, 2013

Modeling energy expenditure in children and adolescents using quantile regression

Advanced mathematical models have the potential to capture the complex metabolic and physiological processes that result in energy expenditure (EE). Study objective is to apply quantile regression (QR) to predict EE and determine quantile-dependent variation in covariate effects in nonobese and obese children. First, QR models will be developed to predict minute-by-minute awake EE at […]

Related Product: Actiheart

Publication Date: July 15, 2013

The Netherlands Epidemiology of Obesity (NEO) study: study design and data collection

Obesity is a well-established risk factor for many chronic diseases. Incomplete insight exists in the causal pathways responsible for obesity-related disorders and consequently, in the identification of obese individuals at risk of these disorders. The Netherlands Epidemiology of Obesity (NEO) study is designed for extensive phenotyping to investigate pathways that lead to obesity-related diseases. The […]

Related Product: Actiheart

Publication Date: April 11, 2013

Body fat, inflammation and gut microbiota in Cuban adolescents

Background and objectives: Body fat excess is associated with insulin resistance, hyperlipemia, inflammation and gut microbiota changes. The aim of this study was to identify these associations in adolescents. Methods: From 420 subjects in study (12-15 years), 26 with overweight, randomly selected, and paired by age and sex with 26 normal adolescents were submitted to […]

Related Product: Actiheart

Publication Date: January 1, 2013

Physical Activity in Preschool Children Measured With Actiheart Monitors

Background and objectives: There are scarce records of physical activity in children of developing countries. Methods: With this objective, 77 preschoolers (5.9 y of age, 37 girls, 40 boys) were evaluated according to WHO growth standards; total daily energy expenditure (TEE) was measured by Actiheart monitors, each 15 seconds during two week-days and 1 week-end-day, […]

Related Product: Actiheart

Publication Date: January 1, 2013

Workplace Stress & Eating Behaviour

There is an obesity epidemic occurring with the UK, so gaining an understanding of the factors which may contribute to overeating is therefore important. •People encounter daily hassles and stressors throughout their day, particularly in the workplace. •80% of individuals are believed to change their caloric intake in response to stress, particularly increasing consumption of […]

Related Product: PRO-Diary

Publication Date: November 1, 2011

Oxyntomodulin increases energy expenditure in addition to decreasing energy intake in overweight and obese humans: a randomised controlled trial

Background: Oxyntomodulin has recently been found to decrease body-weight in obese humans and may be a potential anti-obesity therapy. Objective: To determine whether oxyntomodulin alters energy expenditure, in addition to reducing energy intake, in ‘free-living’ overweight and obese volunteers. Design: Randomized double-blind controlled cross-over trial. Setting: Community and hospital-based. Participants: Fifteen healthy overweight and obese […]

Related Product: Actiheart

Publication Date: December 1, 2006

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