Document Detail

Environmental temperature and glycogen resynthesis.
MedLine Citation:
PMID:  20464645     Owner:  NLM     Status:  MEDLINE    
This study investigated the effects of hot (H) and room temperature (RT) recovery environments on glycogen resynthesis. Nine male participants completed two trials, cycling for 1 h in a temperature-controlled chamber (32.6 degrees C), followed by 4 h of recovery at 32.6 degrees C (H) or 22.2 degrees C (RT). Rectal temperature was continuously recorded. A carbohydrate beverage (1.8 g/kg bodyweight) was supplied at 0 and 2 h post-exercise. Muscle biopsies were taken immediately, 2 h, and 4 h post-exercise for glycogen analysis. Blood samples were taken at 30, 60, 120, 150, 180, and 240 min into recovery for glucose and insulin analysis. Expired gas was collected at 105 min and 225 min into recovery to calculate whole body carbohydrate oxidation. Average core temperature, whole body carbohydrate oxidation, and serum glucose at 120, 150, 180 and 240 min was higher in H compared to RT (p<0.05). Muscle glycogen was higher in RT vs. H at 4 h (105+/-28 vs. 88+/-24 mmolxkg (-1) wet weight, respectively; p<0.05), but no different at 0 and 2 h. There was no difference in serum insulin. These data indicate the importance of minimizing the exposure to heat after exercise to improve recovery, specifically to improve glycogen resynthesis.
M Naperalsky; B Ruby; D Slivka
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-05-12
Journal Detail:
Title:  International journal of sports medicine     Volume:  31     ISSN:  1439-3964     ISO Abbreviation:  Int J Sports Med     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-28     Completed Date:  2010-11-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  561-6     Citation Subset:  IM    
Copyright Information:
(c) Georg Thieme Verlag KG Stuttgart . New York.
University of Montana, Montana Center For Work Physiology and Exercise Metabolism, Missoula, United States.
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MeSH Terms
Bicycling / physiology*
Blood Glucose / metabolism
Body Temperature
Dietary Carbohydrates / administration & dosage
Exercise Test*
Glycogen / biosynthesis*
Hot Temperature
Insulin / blood
Muscle, Skeletal / metabolism
Time Factors
Young Adult
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 11061-68-0/Insulin; 9005-79-2/Glycogen

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