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Increased intensity of a single exercise bout stimulates subsequent fat intake
Klausen B, Toubro S, Ranneries C, Rehfeld JF, Holst JJ, Christensen NJ, Astrup A
International Journal of Obesity and Related Metabolic Disorders 1999 Dec;23(12):1282-1287
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

BACKGROUND: The physical activity pattern in society has in recent years changed from necessary occupational activity to voluntary activities during leisure-time. How this change in lifestyle affects the selection of dietary intakes is presently unknown. OBJECTIVES: The aim of the present study was to investigate the different effects of high versus low-intensity exercise on the following day's dietary energy intake and macronutrient selection. DESIGN: The study was designed as a controlled randomized cross-over study which compared food selection and energy intake the day following a low-intensity versus a high-intensity exercise bout. We included 32 healthy normal-weight subjects of four subgroups (young males, young females, old males and old females). On two different occasions they performed either 60 min low-intensity (30% of VO2max) or 30 min high-intensity (60% of VO2max) exercise during 24 h measurements of energy expenditure. The energy intake and macronutrient selection of the subsequent day was assessed by offering them an adlibitum buffet at breakfast and at lunch. RESULTS: Following the low-intensity exercise the subjects chose a diet with an energy percentage from fat similar to that of their habitual diet-36.7% (95% CI 34.3 to 39.0) versus 35.6% (95% CI 33.0 to 38.2; NS). Following the high-intensity exercise they chose a diet with 39.9% (95% CI 37.2 to 42.6) fat, which was 3.2% (95% CI 0.6 to 5.9) higher than following the low-intensity exercise (p < 0.05) and 4.2% (95% CI 1.1 to 7.4) more than their habitual diet (p < 0.01). CONCLUSIONS: The present study shows that changing the type of activity of a single exercise bout from 30% of maximal aerobic capacity for 60 min to 60% for only 30 min resulted in consumption of a diet the following day with a higher fat energy percentage compared with the diet selected after the low-intensity exercise. However, the higher fat content diet did not result in a higher energy intake.

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