TY - JOUR
T1 - Exercise increases fat oxidation at rest unrelated to changes in energy balance or lipolysis
AU - Calles-Escandón, Jorge
AU - Goran, Michael I.
AU - O'Connell, Maureen
AU - Sreekumaran Nair, K.
AU - Danforth, Elliot
PY - 1996/6
Y1 - 1996/6
N2 - The hypothesis that exercise increases fat oxidation at rest independently of changes in energy balance, body composition, and/or lipolysis was tested in 21 volunteers. After a period of energy balance, volunteers were randomly allocated to one of four groups: control, overfed (OF), overfed and exercised (OF-EX), and exercised (EX). OF and OF-EX were overfed 50% excess of energy balance calories; OF-EX and EX spent 50% excess of energy balance calories during daily exercise sessions. Exercise increased fat oxidation at rest independently of dietary intake (OF-EX = +22 ± 2.4, EX = +23 ± 1.5 mg/min) and reduced carbohydrate oxidation (OF-EX = 49 ± 6.2, EX = 46 ± 5.4 mg/min). Volunteers in the OF group had an increase in carbohydrate oxidation (85 ± 5.9 mg/min) and a decline in fat oxidation(-33 ± 1.4mg/min).Protein oxidation did not change in any group. These changes occurred without a direct relation with changes in lipolysis and persisted even when expressed as a percentage or as an absolute equivalent of resting metabolic rate in calories. Thus exercise, independent of changes in energy intake and body composition and not related to changes in lipolysis, increases fat oxidation at rest, which may explain the beneficial effects of exercise in weight loss programs.
AB - The hypothesis that exercise increases fat oxidation at rest independently of changes in energy balance, body composition, and/or lipolysis was tested in 21 volunteers. After a period of energy balance, volunteers were randomly allocated to one of four groups: control, overfed (OF), overfed and exercised (OF-EX), and exercised (EX). OF and OF-EX were overfed 50% excess of energy balance calories; OF-EX and EX spent 50% excess of energy balance calories during daily exercise sessions. Exercise increased fat oxidation at rest independently of dietary intake (OF-EX = +22 ± 2.4, EX = +23 ± 1.5 mg/min) and reduced carbohydrate oxidation (OF-EX = 49 ± 6.2, EX = 46 ± 5.4 mg/min). Volunteers in the OF group had an increase in carbohydrate oxidation (85 ± 5.9 mg/min) and a decline in fat oxidation(-33 ± 1.4mg/min).Protein oxidation did not change in any group. These changes occurred without a direct relation with changes in lipolysis and persisted even when expressed as a percentage or as an absolute equivalent of resting metabolic rate in calories. Thus exercise, independent of changes in energy intake and body composition and not related to changes in lipolysis, increases fat oxidation at rest, which may explain the beneficial effects of exercise in weight loss programs.
KW - body composition
KW - fatty acids
KW - fuel oxidation
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U2 - 10.1152/ajpendo.1996.270.6.e1009
DO - 10.1152/ajpendo.1996.270.6.e1009
M3 - Article
C2 - 8764186
AN - SCOPUS:0029798157
SN - 0193-1849
VL - 270
SP - E1009-E1014
JO - American Journal of Physiology - Endocrinology and Metabolism
JF - American Journal of Physiology - Endocrinology and Metabolism
IS - 6 33-6
ER -