Abstract |
Whether caloric restriction can alter the efficiency of muscular work raises important questions regarding the control of energetic coupling processes and the efficacy of exercise as a treatment for obesity. To address these issues, oxygen uptake (VO2) was determined at rest and during incremental cycle ergometry in 13 moderately obese (133 +/- 3% ideal body weight, means +/- SEM) women during weight maintenance and after 3 wk of caloric restriction (800 kcal/d). Work efficiency was calculated from the linear portion of the VO2-work rate relationship. Caloric restriction decreased body weight 4.0 +/- 0.4 kg (p less than 0.05), VO2 at rest 32 +/- 3 mL/min (p less than 0.05), and VO2 during unloaded (0 W) cycling 47 +/- 14 mL/min (p less than 0.05). However, work efficiency was unchanged (ie, -0.3 +/- 1.2%, NS). We conclude that, despite metabolic adaptations resulting in decreased energy expenditure at rest and during zero Watt cycling, acute caloric restriction does not alter work efficiency.
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Authors | D C Poole, L C Henson |
Journal | The American journal of clinical nutrition
(Am J Clin Nutr)
Vol. 47
Issue 1
Pg. 15-8
(Jan 1988)
ISSN: 0002-9165 [Print] United States |
PMID | 3337033
(Publication Type: Journal Article)
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Topics |
- Adult
- Diet, Reducing
- Efficiency
(physiology)
- Energy Intake
- Energy Metabolism
- Exercise Test
- Female
- Humans
- Obesity
(diet therapy, physiopathology)
- Oxygen Consumption
- Physical Exertion
- Time Factors
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