Progressive Metabolic Adaptations to Low Intensity Exercise Training and Weight Loss

Summary

the investigators first aim is to determine the effect of low intensity exercise (without weight loss) on insulin sensitivity, muscle lipid metabolism, and factors regulating these processes in skeletal muscle after 1 day, 2 wks, 12 wks of training, and again after 3 days without exercise in obese adults. the investigators second aim is to determine the effect of combining low intensity exercise training with 10% weight loss on insulin sensitivity, muscle lipid metabolism, and factors regulating these processes in skeletal muscle.

Although a single 40 minute session of exercise at a low exercise intensity will not improve insulin sensitivity, the investigators anticipate adaptations after two weeks of exercise training (6 session/wk; 12 session total) will improve insulin sensitivity and be accompanied by a reduction in fatty acid intermediates and a reduction in markers for pro-inflammatory activation in muscle. the investigators anticipate changes in insulin sensitivity, fatty acid partitioning, and pro-inflammatory markers the day after the last session of a 12 wk training program (without weight-loss) will be similar to that measured after 2 weeks of training. the investigators anticipate insulin sensitivity, accumulation of fatty acid intermediates, and pro-inflammatory activation will be markedly improved after 10% weight loss when measured the day after exercise. the investigators would expect the improvements in Insulin sensitivity, accumulation of fatty acid intermediates, and markers of inflammatory stress will be significantly attenuated when measured 3 days after the most recent exercise session, but beneficial effects of 10% weight loss on these metabolic endpoints will persist when compared with before weight loss.

Conditions

• Obesity

Interventions

OTHER

Exercise Training

During the first 12 weeks of the study, subjects will adhere to an exercise training program while maintaining their original body weight. The exercise training program will entail the following: 40min/session, \~50% of their maximal aerobic capacity (approximately 100-110 beats per min), 5-6 days/week

OTHER

Weight Loss with continued Exercise Training

After the first 12 weeks in the study, subjects will continue with the same exercise program, but then they will be placed on a reduced calorie diet until they lose exactly 10% of their original body weight

Sponsors & Collaborators

• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

  collaborator NIH

• University of Michigan

  lead OTHER

Principal Investigators

• Jeffrey F Horowitz · University of Michigan

Study Design

Allocation

NA

Purpose

BASIC_SCIENCE

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

18 Years

Max Age

45 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2011-07-31

Primary Completion

2014-07-18

Completion

2014-07-18

Countries

• United States

Study Locations