Diet, Exercise, Metabolism, and Obesity in Older Women

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

112 participants

Study Classification

INTERVENTIONAL

Study Start Date

2002-11-30

Study Completion Date

2008-11-30

Brief Summary

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Reductions in fat oxidation and resting metabolic rate (RMR) are associated with normal aging and are accelerated with menopause. As a result, postmenopausal women have an increased risk of abdominal obesity and ultimately the metabolic complications that lead to the insulin resistance syndrome and its associated risks (hyperlipidemia, type 2 diabetes, and coronary heart disease). Thus, there is a need to determine the most successful treatment to reduce visceral obesity in postmenopausal women. The purpose of this study is to determine if dietary-induced weight loss alone and/or weight loss combined with exercise at low and high- intensities differentially affect the reduction in visceral adipose tissue in postmenopausal women with abdominal obesity.

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Detailed Description

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Design Overview:

This study's protocol will last approximately 18 months. Phase 1 involves recruitment and screening followed by baseline research testing (Phase 2). Next, subjects will be randomly assigned to one of three 5-month treatments (Phase 3): diet and high-intensity exercise, diet and low-intensity exercise, or diet only. In the Maintenance Phase, subjects will return for visits at 6 \& 12 months following the completion of their 5 month intervention.

Interventions:

All treatment groups will experience the same total weekly caloric deficit (-2800 kcal/wk), but will derive this deficit by different reductions in dietary intake and exercise energy expenditure. The weekly caloric deficit will be accomplished as follows: 1) the diet alone group will reduce dietary intake by \~2800 kcal/week (\~400 kcal/day); 2) both exercise groups will expend \~400 kcal/wk in exercise energy expenditure and will reduce dietary intake by \~2400 kcal/wk (\~340 kcal/day) to achieve the 2800 kcal/wk deficit.

The exercise will take place in an exercise facility at the Geriatric Research Center on the campus of the Wake Forest University/Baptist Medical Center. Two study personnel, including at least one trained technician, will supervise all exercise sessions. Emergency equipment will be kept on site during exercise sessions. Blood pressure and heart rate will be measured and recorded before each exercise session and participants will warm-up by walking for 3-5 min at a slow pace. Women will use the treadmill to exercise at an intensity of 45-50% (low-intensity AEX) or 70-75% (high-intensity AEX) of VO2max. Both groups will exercise 3 d/wk and duration of exercise will progress from 10-15 min the 1st week to 55 min by the end of the 6th week and thereafter for the low-intensity AEX group. The duration of exercise for the high-intensity AEX group will progress from 10-15 min the 1st week to 30 min by the end of the 6th week and thereafter. Injuries are minimized by a feasible progression of exercise duration as well as careful monitoring of proper footwear and stretching exercises.

The diet intervention will consist of monthly meetings with a registered dietitian along with consuming a hypocaloric diet provided by the GCRC metabolic kitchen. Subjects will be asked to pick up their food three times a week. Two meals per day will be provided. In addition, a calcium supplement (1000mg) will be provided. Subjects will be required to keep a diary of other foods consumed including the calcium supplement. The diets will be composed of 50-60% carbohydrate, 15-20% protein, and 25-30% fat with adequate amounts of essential nutrients. The number of calories given to each subject will be estimated from energy expenditure estimates in combination with an activity factor. The diet only group will be provided with an approximate 400 kcal/day energy deficit diet, while both exercise groups will be provided with an approximate 340 kcal/day energy deficit diet. Menus and specific food choices will be determined by GCRC dietitians in consultation with each research subject.

Conditions

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Abdominal Obesity Metabolic Syndrome

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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1

Caloric Restriction

Group Type ACTIVE_COMPARATOR

Caloric Restriction

Intervention Type BEHAVIORAL

Reduced calorie diet (400 kcal/day deficit)

2

Caloric restriction + Moderate-intensity aerobic exercise

Group Type EXPERIMENTAL

Caloric Restriction + Low-Intensity aerobic exercise

Intervention Type BEHAVIORAL

400 kcal/day deficit plus 3 days/week aerobic exercise at 45-50% maximal aerobic fitness

3

Caloric restriction + Vigorous-intensity aerobic exercise

Group Type EXPERIMENTAL

Caloric Restriction plus High-intensity aerobic exercise

Intervention Type BEHAVIORAL

400 kcal/day deficit and 3 d/week of aerobic exercise at 65-75% maximal fitness

Interventions

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Caloric Restriction

Reduced calorie diet (400 kcal/day deficit)

Intervention Type BEHAVIORAL

Caloric Restriction + Low-Intensity aerobic exercise

400 kcal/day deficit plus 3 days/week aerobic exercise at 45-50% maximal aerobic fitness

Intervention Type BEHAVIORAL

Caloric Restriction plus High-intensity aerobic exercise

400 kcal/day deficit and 3 d/week of aerobic exercise at 65-75% maximal fitness

Intervention Type BEHAVIORAL

Other Intervention Names

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Diet Only Diet+Low-Intensity AEX Diet+High-intensity AEX

Eligibility Criteria

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Inclusion Criteria

* Currently 50 - 70 years of age (at screening)
* Post-menopausal at least 1 year
* Waist diameter of at least 34"
* Able to attend exercise classes 3 times per week
* BMI between 25 \& 40 kg/m2
* MMSE \> 25

Exclusion Criteria

* Exercises regularly (ie- more than twice a week for more than 15 minutes per session)?
* Uncontrolled diabetes mellitus or insulin-controlled diabetes?
* Does not drive and does not have a reliable way to pick up meals once a week
* Cancer in past 5 years except skin cancer
* Unwilling or unable to eat prepared foods (non-compliant during test week)
* Unwilling or unable to record food intake accurately
* Self-reported weight loss or gain \>5% in past 6 months
* Smoking within past year, or use of tobacco or nicotine product
* Coronary artery disease, liver disease, renal disease, or other systemic disorders
* Pulmonary disease
* Current use of thiazide diuretics, beta blockers or steroids
* Current use of more than one anti-hypertensive medication
* Current use of anti-depressants or hormone replacement therapy
* Gross physical impairment
* Blindness or retinopathy
* Triglyceride level \>400 mg/dl
* Anemia (Hct \< 37%)
* Contraindication to exercise by ECG or GXT

Minimum Eligible Age

50 Years

Maximum Eligible Age

70 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

Yes