Document Detail


Effect of exercise on the diurnal variation in energy substrate use during a high-fat diet.
MedLine Citation:
PMID:  22382668     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Aerobic exercise increases 24-h fat oxidation following initiation of a high-fat 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 non-protein respiratory exchange ratio (NPRER). This data, collected continuously (24-h 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 (0.77 ± 0.01 01 vs. 0.81 ± 0.01, p < 0.001), higher for the exercise + recovery segment (0.88 ± 0.01 vs. 0.86 ± 0.01, p < 0.001), 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 vs.16 ± 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.
Authors:
K R Hawkins; K C Hansen; D A Schoeller; J A Cooper
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Intramural     Date:  2012-03-01
Journal Detail:
Title:  European journal of applied physiology     Volume:  112     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-10-18     Completed Date:  2013-07-12     Revised Date:  2013-11-07    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  3775-85     Citation Subset:  IM    
Affiliation:
Department of Nutrition, Hospitality, and Retailing, Texas Tech University, P.O. Box 41240, Lubbock, TX 79409, USA.
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MeSH Terms
Descriptor/Qualifier:
Adipose Tissue
Adolescent
Adult
Circadian Rhythm / physiology*
Diet, High-Fat*
Energy Intake / physiology*
Exercise / physiology*
Female
Humans
Male
Middle Aged
Oxidation-Reduction
Oxygen Consumption
Grant Support
ID/Acronym/Agency:
1UL1RR025011/RR/NCRR NIH HHS; DK30031/DK/NIDDK NIH HHS; R01 DK030031/DK/NIDDK NIH HHS; T32 DK007665/DK/NIDDK NIH HHS; T32 DK007665/DK/NIDDK NIH HHS; UL1 RR025011/RR/NCRR NIH HHS; UL1 TR000427/TR/NCATS NIH HHS
Comments/Corrections

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