Effect of a protein-sparing diet on responses to exercise in obese subjects.
We have studied muscular work efficiency and VO2 peak in seven obese individuals (body mass index: 38.9 +/- 5.8 kg.m-2) before and after twelve days of a low-caloric diet (protein-sparing modified fast) providing about 2460 kJ/day. Respiratory gas exchanges were measured at rest and during an exercise protocol through a rubber mask connected to a pneumotachograph and a mass spectrometer. A significant reduction in body mass was observed with the diet therapy (109 +/- 12 vs 105 +/- 14 kg; p < 0.02). No significant differences were observed in VO2 peak (1.78 +/- 0.32 vs 1.88 +/- 0.43 l/min, p > 0.05) and work efficiency (26 +/- 5 vs 24 +/- 4%, p > 0.05), after the diet protocol. It is concluded that the low-caloric diet used had no effect on muscular work efficiency.
Anton-Kuchly
B
B
Department of Metabolic Diseases, Hotel Dieu, Nantes, France.
Ranganathan
S
S
Potiron
M
M
Louvet
S
S
Charbonnel
B
B
Krempf
M
M
Ginet
J
J
D000293:Adolescent; D000328:Adult; D004038:Diet, Reducing; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000502:physiology; D009765:Obesity / Q000178:diet therapy / Q000503:physiopathology*; D010101:Oxygen Consumption