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- Title
Effect of Exercise Duration and Intensity on Weight Loss in Overweight, Sedentary Women: A Randomized Trial.
- Authors
Jakicic, John M.; Marcus, Bess H.; Gallagher, Kara I.; Napolitano, Melissa; Lang, Wei
- Abstract
Context: A higher duration and intensity of exercise may improve long-term weight loss. Objective: To compare the effects of different durations and intensities of exercise on 12-month weight loss and cardiorespiratory fitness. Design, Setting, and Participants: Randomized trial conducted from January 2000 through December 2001 involving 201 sedentary women (mean [SD] age, 37.0 [5.7] years; mean [SD] body mass index, 32.6 [4.2]) in a university-based weight control program. Intervention: Participants were randomly assigned to 1 of 4 exercise groups (vigorous intensity/high duration; moderate intensity/high duration; moderate intensity/moderate duration; or vigorous intensity/moderate duration) based on estimated energy expenditure (1000 kcal/wk vs 2000 kcal/wk) and exercise intensity (moderate vs vigorous). All women were instructed to reduce intake of energy to between 1200 and 1500 kcal/d and dietary fat to between 20% and 30% of total energy intake. Main Outcome Measures: Body weight, cardiorespiratory fitness, and exercise participation. Results: After exclusions, 184 of 196 randomized participants completed 12 months of treatment (94%). In intention-to-treat analysis, mean (SD) weight loss following 12 months of treatment was statistically significant (P <.001) in all exercise groups (vigorous intensity/high duration = 8.9 [7.3] kg; moderate intensity/high duration = 8.2 [7.6] kg; moderate intensity/moderate duration = 6.3 [5.6] kg; vigorous intensity/moderate duration = 7.0 [6.4] kg), with no significant difference between groups. Mean (SD) cardiorespiratory fitness levels also increased significantly (P = .04) in all groups (vigorous intensity/high duration = 22.0% [19.9%]; moderate intensity/high duration = 14.9% [18.6%]; moderate intensity/moderate duration = 13.5% [16.9%]; vigorous intensity/moderate duration = 18.9% [16.9%]), with no difference between groups. Post hoc analysis revealed that percentage weight loss at 12 months was associated with the l...
- Subjects
PHYSICAL fitness; WEIGHT loss; BODY weight; OBESITY in women
- Publication
JAMA: Journal of the American Medical Association, 2003, Vol 290, Issue 10, p1323
- ISSN
0098-7484
- Publication type
Article
- DOI
10.1001/jama.290.10.1323