The Comparison of Energy in Take and Body Weight EXERCISE

Completed

Conditions: Exercise
Body Weight
Energy

Registration Number: NCT01264406

Lead Sponsor: Pennington Biomedical Research Center

Brief Summary: This study will compare the effect of two doses of exercise on energy intake and body weight. The comparison will be between three groups; two exercise groups and a control group. The exercise groups will not be provided with a dietary intervention and the study design also includes a non-exercise control group. E-Mechanic trial can make important contributions to understanding of the role of exercise dose in weight management. While it is accepted that regular exercise plays an important role in general health, the exact role of exercise in prevention of weight gain, weight loss and prevention of weight regain remains poorly understood despite exercise being widely prescribed for these purposes. The idea that current weight management exercise recommendations may produce increased energy intake (or other forms on compensation) resulting in disappointing weight loss is an important public health issue. The finding of this study could help shape future exercise and weight loss recommendations and treatment plans.

Detailed Description: The purpose of the E-MECHANIC Trial is to test the effect of two doses of exercise on energy intake, body weight, body composition, activity levels, and metabolic rate. The exercise doses will reflect current recommendations for: 1) general health (8 KKW), and 2) weight loss (20 KKW). A non-exercise control group will also be recruited. The primary outcome variables are: 1) energy intake, and 2) the discrepancy between expected weight loss and observed weight loss. Energy intake will be measured using doubly labeled water and laboratory-based food intake tests. Secondary outcome variables include resting metabolic rate, activity levels (excluding structured exercise), and body composition. Following a comprehensive baseline assessment, participants will be randomly assigned to the 8 KKW, 20 KKW, or control group in a 1:1:1 ratio. Additional assessments will be conducted at week 4, with another comprehensive assessment at week 24. The week 4 assessment is important to determine if endpoints change in the short-term, but not long-term.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 198

Inclusion Criteria

Male or female 18 - 65 years old, inclusive
- Not exercising > 20 minutes on > 3 days/wk and taking < 8000 steps/d over one week measured with step counters.
- BMI > 25 kg/m2 and < 40 kg/m2

Exclusion Criteria

• Current consumption of more than 14 alcoholic drinks per week
- Plan to move out of the study area within the next 6 months or plan to be out of the study area for more than 4 weeks in the next 6 months
- Have another member of household participating in the study
- Residence too far from Pennington
- A past history and/or physical examination or laboratory findings of the following medical conditions:

Table 1. Exclusion Criteria

Cardiovascular disease (CVD) or disorders Potential participants with a history of CVD
Blood Pressure Potential participants who are on a stable dose of antihypertensive medication, with the exception of beta-blockers, and whose blood pressure is controlled will be eligible for enrollment.
Diabetes Potential participants with a previous diagnosis of diabetes (Type 1 or 2) or a fasting plasma glucose >125 mg/dl will be excluded from the study.
Blood lipids Potential participants whose LDL-C 190 mg/dl or TG levels 300 mg/dl will be referred to their physician.
Hematologic disorders Participants diagnosed with hematologic disorders, including anemias, bleeding disorders, chronic thrombotic disorders, or hypercoagulable states, will not be allowed into the study.
Recent blood donation or blood loss Blood donation or blood loss from surgery or trauma during the 6 weeks before the baseline evaluation
Weight loss-20 or more kilograms in the past year Other exclusions.
Hospitalization for mental illness within the past 5 years or currently undergoing treatment for severe mental illness. Plans to be out of the city more than 4 weeks over the next 6 months
Other significant medical conditions Including but not limited to chronic or recurrent respiratory, gastrointestinal, neuromuscular, neurological, or psychiatric conditions. Musculoskeletal problems interfering with exercise.
Autoimmune or collagen vascular diseases. Immunodeficiency diseases or a positive HIV test. Malignancies in the past 5 years, with the exception of non-melanoma skin cancer therapeutically controlled. Any other medical condition or disease that is life-threatening or that can interfere with or be aggravated by exercise

Study & Design

Study Type: OBSERVATIONAL

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
A Comparison of the Effects of Energy Balance With Three Groups. [Energy Intake, Adjusted DLW]	6 months after screening	A comparison of three groups for the effects of energy balance: 1. Healthy Living, 2. Recommended dose exercise, and 3. High dose exercise. Random assignment is determined by chance. Healthy Living Group: Information tips on a variety of topics, including stress management, the benefits of eating fruits and vegetables, and other health related matters. This information is sent directly to your cell phone or email address throughout the study. Encouragements are sent to attend monthly seminars on various health topics at Pennington. Maintain a baseline level of exercise throughout the study. Recommended Dose Exercise: 3 t0 4 low-intensity sessions per week, each lasting about 30 minutes, at Pennington Fitness and Wellness Center. All exercise will be done on a treadmill. High Dose Exercise: 4 to 5 high-intensity session s per week, each lasting about 50-70 minutes, at Pennington Fitness and wellness center. All exercise will be done on the treadmill.

Secondary Outcome Measures