Epigenetic reprogramming in metabolic disorders: nutritional factors and beyond.

Environmental factors (e.g., malnutrition and physical inactivity) contribute largely to metabolic disorders including obesity, type 2 diabetes, cardiometabolic disease and nonalcoholic fatty liver diseases.

Skeletal muscle autophagy and mitophagy in endurance-trained runners before and after a high-fat meal.

Objective: We tested the hypothesis that skeletal muscle of endurance-trained male runners would exhibit elevated autophagy and mitophagy markers, which would be associated with greater metabolic flexibility following a high-fat meal (HFM).

Methods: Muscle biopsies were collected to determine differences in autophagy and mitophagy protein markers and metabolic flexibility under fasting conditions and 4 h following a HFM between endurance-trained male runners (n = 10) and sedentary, non-obese controls (n = 9).

Results: Maximal oxygen consumption (ml·kg·min) was approximately 50% higher (p < 0.

Autophagy in Adipocyte Differentiation.

Adipose tissue regulates metabolic homeostasis by acting as an endocrine organ and energy reservoir. Adipose tissue development and functional maintenance are dependent on adipocyte differentiation, in which autophagy plays an important role. It has been shown that autophagy deficiency dampens adipocyte differentiation, compromises adipose tissue development, dysregulates adipocytokine secretion, and even causes sudden death in young animals.

Improving physical activity program adoption using integrated research-practice partnerships: an effectiveness-implementation trial.

Integrated research-practice partnerships (IRPPs) may improve adoption of evidence-based programs. The aim of this study is to compare adoption of an IRPP-developed physical activity (PA) program (Fit Extension, FitEx) to a typical efficacy-effectiveness-dissemination pipeline model program (Active Living Every Day, ALED). Guided by the Reach Effectiveness Adoption Implementation Maintenance (RE-AIM) framework, a randomized controlled trial assigned health educators (HEs) to FitEx (n = 18) or ALED (n = 18).

Uptake of evidence-based physical activity programs: comparing perceptions of adopters and nonadopters.

Translating evidence-based physical activity interventions into practice have been problematic. Limited research exists on the adoption decision-making process. This study explored health educator perceptions of two evidence-based, physical activity programs-one was developed through an integrated research-practice partnership approach (FitEx) and the other was research-developed, Active Living Every Day (ALED).

Resistance exercise training and in vitro skeletal muscle oxidative capacity in older adults.

Whether resistance exercise training (RET) improves skeletal muscle substrate oxidative capacity and reduces mitochondrial production of reactive oxygen species in older adults remains unclear. To address this, 19 older males (≥60 years) were randomized to a RET (n = 11) or to a waitlist control group (n = 8) that remained sedentary for 12 weeks. RET was comprised of three upper body and four lower body movements on resistance machines.

Mitochondrial Epigenetic Changes Link to Increased Diabetes Risk and Early-Stage Prediabetes Indicator.

Type 2 diabetes (T2D) is characterized by mitochondrial derangement and oxidative stress. With no known cure for T2D, it is critical to identify mitochondrial biomarkers for early diagnosis of prediabetes and disease prevention. Here we examined 87 participants on the diagnosis power of fasting glucose (FG) and hemoglobin A1c levels and investigated their interactions with mitochondrial DNA methylation.

Brief self-efficacy scales for use in weight-loss trials: Preliminary evidence of validity.

Self-efficacy is a commonly included cognitive variable in weight-loss trials, but there is little uniformity in its measurement. Weight-loss trials frequently focus on physical activity (PA) and eating behavior, as well as weight loss, but no survey is available that offers reliable measurement of self-efficacy as it relates to each of these targeted outcomes. The purpose of this study was to test the psychometric properties of brief, pragmatic self-efficacy scales specific to PA, healthful eating and weight-loss (4 items each).

The effect of prebiotic supplementation with inulin on cardiometabolic health: Rationale, design, and methods of a controlled feeding efficacy trial in adults at risk of type 2 diabetes.

Prediabetes is associated with low-grade chronic inflammation that increases the risk for developing type 2 diabetes (T2D) and cardiovascular disease (CVD). An elevated lipopolysaccharide concentration, associated with dysbiosis of the intestinal microbiota, has been implicated in the development of both T2D and CVD. Selective modulation of the intestinal microbiota with prebiotics reduces intestinal permeability and endotoxin concentrations, inflammation, and metabolic dysfunction in rodents.

Probiotic supplementation attenuates increases in body mass and fat mass during high-fat diet in healthy young adults.

Objective: The objective was to determine the effects of the probiotic, VSL#3, on body and fat mass, insulin sensitivity, and skeletal muscle substrate oxidation following 4 weeks of a high-fat diet.

Methods: Twenty non-obese males (18-30 years) participated in the study. Following a 2-week eucaloric control diet, participants underwent dual X-ray absorptiometry to determine body composition, an intravenous glucose tolerance test to determine insulin sensitivity, and a skeletal muscle biopsy for measurement of in vitro substrate oxidation.

Probiotic supplementation and trimethylamine-N-oxide production following a high-fat diet.

Objective: The objective of this study was to test the hypothesis that the multi-strain probiotic VSL#3 would attenuate the increase in fasting plasma concentrations of trimethylamine-N-oxide (TMAO) following a high-fat diet.

Methods: Nineteen healthy, non-obese males (18-30 years) participated in the present study. Following a 2-week eucaloric control diet, subjects were randomized to either VSL#3 (900 billion live bacteria) or placebo (cornstarch) during the consumption of a hypercaloric (+1,000 kcal day(-1) ), high-fat diet (55% fat) for 4 weeks.

Examining the Feasibility of Smartphone Game Applications for Physical Activity Promotion in Middle School Students.

Objective: The objective of this study was to determine the feasibility (i.e., limited efficacy testing, practicality, and acceptability) of a 6-week smartphone game-based applications program for promoting physical activity (PA) in adolescents in an afterschool program.

Short-term high-fat diet increases postprandial trimethylamine-N-oxide in humans.

The gut microbiota plays an obligatory role in the metabolism of nutrients containing trimethylamine moieties, such as L-carnitine and choline, leading to the production of the proatherogenic trimethylamine-N-oxide (TMAO). We hypothesized that a short-term, high-fat diet would increase fasting and postprandial plasma concentrations of TMAO in response to a high-fat meal challenge. Following a 2-week eucaloric control diet, 10 nonobese men (18-30 years) consumed a eucaloric, high-fat diet (55% fat) for 5 days.

FoxO1: mute for a tuned metabolism?

The transcription factor forkhead box O1 (FoxO1) plays pleiotropic roles in insulin-mediated glucose and lipid metabolism. In the liver, glucose production is finely controlled by insulin signaling that dampens FoxO1. Two recent studies show that silencing of FoxO1 is also essential for extra-hepatic insulin signaling to maintain glucose homeostasis.

Metabolic endotoxemia with obesity: Is it real and is it relevant?

Obesity is associated with metabolic derangements in multiple tissues, which contribute to the progression of insulin resistance and the metabolic syndrome. The underlying stimulus for these metabolic derangements in obesity are not fully elucidated, however recent evidence in rodents and humans suggests that systemic, low level elevations of gut derived endotoxin (lipopolysaccharide, LPS) may play an important role in obesity related, whole-body and tissue specific metabolic perturbations. LPS initiates a well-characterized signaling cascade that elicits many pro- and anti-inflammatory pathways when bound to its receptor, Toll-Like Receptor 4 (TLR4).

GrOup based physical Activity for oLder adults (GOAL) randomized controlled trial: study protocol.

Background: Physical activity has health benefits across the lifespan, yet only 13 % of Canadian older adults are sufficiently active. Results from a number of observational studies indicate that adults display positive preferences for exercising with others of a similar age and same gender, and that intra-group age- and gender-similarity are associated with elevated exercise adherence. However, research has yet to experimentally examine the extent to which intra-group age- and gender-related similarity affect exercise adherence behaviors.

Selective overexpression of Toll-like receptor-4 in skeletal muscle impairs metabolic adaptation to high-fat feeding.

Toll-like receptor-4 (TLR-4) is elevated in skeletal muscle of obese humans, and data from our laboratory have shown that activation of TLR-4 in skeletal muscle via LPS results in decreased fatty acid oxidation (FAO). The purpose of this study was to determine whether overexpression of TLR-4 in skeletal muscle alters mitochondrial function and whole body metabolism in the context of a chow and high-fat diet. C57BL/6J mice (males, 6-8 mo of age) with skeletal muscle-specific overexpression of the TLR-4 (mTLR-4) gene were created and used for this study.

Effectiveness of a worksite-based weight loss randomized controlled trial: the worksite study.

Objective: To determine the effectiveness of an individually targeted Internet-based intervention with monetary incentives (INCENT) at reducing weight of overweight and obese employees when compared with a less-intensive intervention (Livin' My Weigh [LMW]) 6 months after program initiation.

Methods: Twenty-eight worksites were randomly assigned to either INCENT or LMW conditions. Both programs used evidence-based strategies to support weight loss.

Angiotensin II receptor blockade and skeletal muscle metabolism in overweight and obese adults with elevated blood pressure.

Objectives: Whether angiotensin II receptor blockade improves skeletal muscle fatty acid oxidation in overweight and obese humans is unknown. The purpose of the study was to test the hypothesis that the angiotensin II receptor blocker, olmesartan, would increase fatty acid oxidation and the activity of enzymes associated with oxidative metabolism in skeletal muscle of overweight and obese humans.

Methods: A total of 12 individuals (6 men and 6 women) aged 18-75 and with a body mass index ⩾25 kg/m2 were assigned to olmesartan or placebo for 8 weeks in a crossover fashion.

Design and methods of "diaBEAT-it!": a hybrid preference/randomized control trial design using the RE-AIM framework.

Background: Diabetes prevention is a public health priority that is dependent upon the reach, effectiveness, and cost of intervention strategies. However, understanding each of these outcomes within the context of randomized controlled trials is problematic.

Purpose: To describe the methods and design of a hybrid preference/randomized control trial using the RE-AIM framework.

Physical activity promotion in Latin American populations: a systematic review on issues of internal and external validity.

The purpose of this review was to determine the degree to which physical activity interventions for Latin American populations reported on internal and external validity factors using the RE-AIM framework (reach & representativeness, effectiveness, adoption, implementation, maintenance). We systematically identified English (PubMed; EbscoHost) and Spanish (SCIELO; Biblioteca Virtual en Salud) language studies published between 2001 and 2012 that tested physical activity, exercise, or fitness promotion interventions in Latin American populations. Cross-sectional/descriptive studies, conducted in Brazil or Spain, published in Portuguese, not including a physical activity/fitness/exercise outcome, and with one time point assessment were excluded.

Targeting mitochondrial alterations to prevent type 2 diabetes--evidence from studies of dietary redox-active compounds.

As a growing epidemic, type 2 diabetes mellitus (T2DM) has significantly affected the individual's quality of life and economy of the society. Understanding the mechanisms of the disease and discovery of new therapeutic options has become more urgent than ever before. Mitochondrial alterations (e.

Group-based lifestyle sessions for gestational weight gain management: a mixed method approach.

Objective: To integrate group-based lifestyle sessions (GBLS) within prenatal care for gestational weight gain (GWG) management.

Methods: In Study 1, participants attended GBLS during prenatal care visits. Participants in Study 2 attended off-site GBLS whereby care providers were asked to discuss the program with patients.