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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer-Verlag

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DOI

10.1016/0009-2614(82)83392-7

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1439-6327

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Effect of exercise on the diurnal variation in ene

Authors: K R Hawkins K C Hansen D A Schoeller J A Cooper
Publish Date: 2012/03/01
Volume: 112, Issue: 11, Pages: 3775-3785
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Abstract

Aerobic exercise increases 24h fat oxidation following initiation of a highfat diet The objective of this study is to examine the time course of increased fat oxidation under exercise and sedentary conditions Eighteen healthy subjects completed a randomized crossover design sedentary and exercise visits staying for five consecutive days in a metabolic chamber each visit On day 1 30 of energy intake was from fat days 2–5 had 50 of energy as fat During exercise subjects rode on a stationary cycle at 45 of VO2max for 1 h in the mornings and evenings Respiratory gases and urinary nitrogen were collected to calculate macronutrient oxidation and nonprotein respiratory exchange ratio NPRER This data collected continuously 24h periods were subsequently divided into three time segments 1 exercise + recovery 1000–1200 hours 2100–2200 hours 2 sleep 2300–0645 hours and 3 wake all remaining hours NPRER on exercise versus sedentary visits was lower for the sleep segment 077 ± 001 01 vs 081 ± 001 p 0001 higher for the exercise + recovery segment 088 ± 001 vs 086 ± 001 p 0001 and was not different for the wake segment Fat oxidation was significantly higher for exercise versus sedentary treatments during sleep 41 ± 2 vs 31 ± 2 g wake 62 ± 3 vs 51 ± 3 g and exercise + recovery segments 33 ± 3 vs16 ± 1 g but so was fat intake by design 171 ± 8 vs 128 ± 7 g/d Although exercise showed greater fat oxidation during all segments dietary fat intake was also higher Therefore based on NPRER the time of day during which the exercise treatment increased the ratio of fat to carbohydrate oxidation was during sleep

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