Exercise & Body Weight - Study
Effects of a 16-month randomized controlled
exercise trial on body weight and composition in young, overweight men
and women: the Midwest Exercise Trial.
In light of the current obesity epidemic,
treatment models are needed that can prevent weight gain or provide weight
loss. We examined the long-term effects of a supervised program of moderate-intensity
exercise on body weight and composition in previously sedentary, overweight
and moderately obese men and women. We hypothesized that a 16-month program
of verified exercise would prevent weight gain or provide weight loss
in the exercise group compared with controls.
Exercise-Weight Study - Methods
This was a randomized controlled efficacy trial. Participants were recruited
from 2 midwestern universities and their surrounding communities. One
hundred thirty-one participants were randomized to exercise or control
groups, and 74 completed the intervention and all laboratory testing.
Exercise was supervised, and the level of energy expenditure of exercise
was measured. Controls remained sedentary. All participants maintained
ad libitum diets.
Exercise-Weight Study - Results
Exercise prevented weight gain in women and produced weight loss in men.
Men in the exercise group had significant mean +/- SD decreases in weight
(5.2 +/- 4.7 kg), body mass index (calculated as weight in kilograms divided
by the square of height in meters) (1.6 +/- 1.4), and fat mass (4.9 +/-
4.4 kg) compared with controls. Women in the exercise group maintained
baseline weight, body mass index, and fat mass, and controls showed significant
mean +/- SD increases in body mass index (1.1 +/- 2.0), weight (2.9 +/-
5.5 kg), and fat mass (2.1 +/- 4.8 kg) at 16 months. No significant changes
occurred in fat-free mass in either men or women; however, both had significantly
reduced visceral fat.
Exercise-Weight Study - Conclusions
Moderate-intensity exercise sustained for 16 months is effective for weight
management in young adults.
Source: Donnelly JE, Hill JO, Jacobsen
DJ, Potteiger J, Sullivan DK, Johnson SL, Heelan K, Hise M, Fennessey
PV, Sonko B, Sharp T, Jakicic JM, Blair SN, Tran ZV, Mayo M, Gibson C,
Washburn RA. 2002
Weight Loss News
Theories about how to lose weight, how to reduce obesity and general weight
management are constantly changing along with ideas about which weight
loss diet program is best and so forth. At present, however, a balanced
diet combined with regular exercise remains the favorite weight loss strategy
of most dietitians and weight loss experts. Return to Weight Loss Data
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