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 100 Results

The causal role of breakfast in energy balance and health: a randomized controlled trial in obese adults

Background: The causal nature of associations between breakfast and health remain unclear in obese individuals. Objective: We sought to conduct a randomized controlled trial to examine causal links between breakfast habits and components of energy balance in free-living obese humans. Design: The Bath Breakfast Project is a randomized controlled trial with repeated measures at baseline […]

Related Product: Actiheart

Publication Date: February 10, 2016

Strong and persistent effect on liver fat with a Paleolithic diet during a two-year intervention

Background/Objectives: Our objective was to investigate changes in liver fat and insulin sensitivity during a 2-year diet intervention. An ad libitum Paleolithic diet (PD) was compared with a conventional low-fat diet (LFD). Subjects/Methods: Seventy healthy, obese, postmenopausal women were randomized to either a PD or a conventional LFD. Diet intakes were ad libitum. Liver fat […]

Related Product: Actiheart

Publication Date: January 20, 2016

Validation of total daily energy expenditure calculated with Actiheart against doubly labeled water method in Costa Rican schoolchildren

The purpose of this study was to use the measurement of the PAEE taken from Actiheart in order to calculate the TEE in Costa Rican schoolchildren, and at the same time, to determine the effectiveness when it is compared against the TEE obtained by the DLW. A total of sixteen male schoolchildren were measured for […]

Related Product: Actiheart

Publication Date: October 8, 2015

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

KSR2 mutations are associated with obesity, insulin resistance, and impaired cellular fuel oxidation

Kinase suppressor of Ras 2 (KSR2) is an intracellular scaffolding protein involved in multiple signaling pathways. Targeted deletion of Ksr2 leads to obesity in mice, suggesting a role in energy homeostasis. We explored the role of KSR2 in humans by sequencing 2,101 individuals with severe early-onset obesity and 1,536 controls. We identified multiple rare variants […]

Related Product: Actiheart

Publication Date: October 24, 2013

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

Physical activity energy expenditure is associated with 2-h insulin independently of obesity among Inuit in Greenland

Aims Indigenous populations throughout the Arctic are experiencing a rapid increase in the prevalence of obesity and type 2 diabetes. The role of physical activity in relation to glucose metabolism in Arctic populations is not well studied. We examined the association between objectively measured physical activity energy expenditure (PAEE) and glucose metabolism in a population-based […]

Related Product: Actiheart

Publication Date: October 7, 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

Rare variants in single-minded 1 (SIM1) are associated with severe obesity

Single-minded 1 (SIM1) is a basic helix-loop-helix transcription factor involved in the development and function of the paraventricular nucleus of the hypothalamus. Obesity has been reported in Sim1 haploinsufficient mice and in a patient with a balanced translocation disrupting SIM1. We sequenced the coding region of SIM1 in 2,100 patients with severe, early onset obesity […]

Related Product: Actiheart

Publication Date: June 17, 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

Physical activity intensity, sedentary time, and body composition in preschoolers

Background: Detailed associations between physical activity (PA) subcomponents, sedentary time, and body composition in preschoolers remain unclear. Objective: We examined the magnitude of associations between objectively measured PA subcomponents and sedentary time with body composition in 4-y-old children. Design: We conducted a cross-sectional study in 398 preschool children recruited from the Southampton Women’s Survey. PA […]

Related Product: Actiheart

Publication Date: April 3, 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

Acute Exercise and Subsequent Nutritional Adaptations

The imbalance between energy expenditure and energy intake is the main factor accounting for the progression of obesity. For many years, physical activity has been part of weight-loss programmes to increase energy expenditure. It is now recognized that exercise can also affect appetite and energy consumption. In the context of seeking new obesity treatments, it […]

Related Product: Actiheart

Publication Date: December 23, 2012

Fat free mass explains the relationship between stunting and energy expenditure in urban Mexican Maya children

Background: Childhood stunting has been associated with an increased risk of obesity in adulthood, but the causes are unclear. This study hypothesizes that stunting significantly reduces both resting and activity energy expenditure. Aim: To assess and describe energy expenditure of low socio-economic Maya children and to determine whether stunting is independently related to energy expenditure […]

Related Product: Actiheart

Publication Date: October 4, 2012

Evaluation of a health promotion program in children: study protocol and design of the cluster-randomized Baden-Württemberg primary school study

Background Increasing prevalences of overweight and obesity in children are known problems in industrialized countries. Early prevention is important as overweight and obesity persist over time and are related with health problems later in adulthood. “Komm mit in das gesunde Boot – Grundschule” is a school-based program to promote a healthier lifestyle. Main goals of […]

Related Product: Actiheart

Publication Date: March 6, 2012

Objectively Measured Total Physical Activity Rather Than Moderate-to-Vigorous Activity is Associated with Cardiovascular Risk Factors in Yup’ik Eskimo People

Regular physical activity is associated with reduced cardiovascular risk. Most physical activity recommendations to reduce cardiovascular risk focus on moderate-to-vigorous physical activity (MVPA) like brisk walking for 30 minutes per day. Physical activity is a complex exposure consisting of multiple subcomponents. The purpose of our analysis was to determine how subcomponents of physical activity measured […]

Related Product: Actiheart

Publication Date: November 22, 2011

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

Impact of a combined diet and progressive exercise intervention for overweight and obese children: the BEHIP study

The Biochemical Evaluation of a Health Intervention Programme (B.E. H.I.P.) investigated the impact of progressive exercise intensity in overweight and obese children. A 5-month prospective randomized crossover design (XA, immediate intervention; OB, control group; XB, delayed intervention, OA, postintervention follow-up) with a 10-week health intervention programme was employed. The intervention utilized a progressive increase in […]

Related Product: Actiheart

Publication Date: August 17, 2011

One-year Changes in Activity and in Inactivity Objectively Measured Among Overweight and Obese Children

Participation in physical activity (PA) during childhood can help to reduce the onset of risk factors associated with ill health. Seasonal influences play a large role in determining PA behaviors. Lack of information about overweight (OW) and obese (OB) children PA and sedentary (SED) behaviors, evaluated during a whole year, has made it difficult to […]

Related Product: Actiheart

Publication Date: June 4, 2011

Video game playing increases food intake in adolescents: a randomized crossover study

Background: Video game playing has been linked to obesity in many observational studies. However, the influence of this sedentary activity on food intake is unknown. Objective: The objective was to examine the acute effects of sedentary video game play on various components of energy balance. Design: With the use of a randomized crossover design, 22 […]

Related Product: Actiheart

Publication Date: April 13, 2011

Intensive exercise: a remedy for childhood obesity?

Background Acute exercise can affect the energy intake regulation, which is of major interest in terms of obesity intervention and weight loss. Objective To test the hypothesis that intensive exercise can affect the subsequent energy intake and balance in obese adolescents. Design The study was conducted in 2009 and enrolled 12 obese pubertal adolescents ages […]

Related Product: Actiheart

Publication Date: February 1, 2011

Assessment of acute and chronic pharmacological effects on energy expenditure and macronutrient oxidation in humans: responses to ephedrine

Evidence of active brown adipose tissue in human adults suggests that this may become a pharmacological target to induce negative energy balance. We have explored whole-body indirect calorimetry to detect the metabolic effects of thermogenic drugs through administration of ephedrine hydrochloride and have assessed ephedrine’s merits as a comparator compound in the evaluation of novel […]

Related Product: Actiheart

Publication Date: January 1, 2011

Combining accelerometry and HR for assessing preschoolers’ physical activity

Purpose With rising obesity and rapidly decreasing levels of physical activity (PA) in young children, accurate PA measurement is needed for early screening and intervention evaluation. Although the combination of accelerometry (ACC) with HR recordings is accurate in assessing PA intensity in older children, its utility in correctly classifying PA in preschoolers is unknown. Methods […]

Related Product: Actiheart

Publication Date: December 1, 2010

Developing obesity prevention interventions among minority ethnic children in schools and places of worship: The DEAL (DiEt and Active Living) study

Background Childhood obesity is a major public health concern with serious implications for the sustainability of healthcare systems. Studies in the US and UK have shown that ethnicity is consistently associated with childhood obesity, with Black African origin girls in particular being more vulnerable to overweight and obesity than their White peers. Little is known, […]

Related Product: Actiheart

Publication Date: December 21, 2009

Prediction of Energy Expenditure from Heart Rate and Accelerometry in Children and Adolescents using Multivariate Adaptive Regression Splines Modeling

Free-living measurements of 24-h total energy expenditure (TEE) and activity energy expenditure (AEE) are required to better understand the metabolic, physiological, behavioral, and environmental factors affecting energy balance and contributing to the global epidemic of childhood obesity. The specific aim of this study is to develop a model based on direct ambulatory monitoring of heart […]

Related Product: Actiheart

Publication Date: November 1, 2009

The Actiheart accelerometer as a method to record energy expenditure of preschool children

In the past three decades, the number of overweight children aged 6-12 years has tripled and the number of overweight adolescents aged 12-19 years has doubled. The underlying reason for the obesity epidemic is complex, but reduced physical activity is likely a major contributor. Therefore, while quantifying energy expenditure is important, relatively little research has […]

Related Product: Actiheart

Publication Date: May 1, 2009

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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