Document Detail

Progressive Dehydration during Cycling Increases Skeletal Muscle Glycogenolysis and Perceived Exertion in Hydrated Males.
MedLine Citation:
PMID:  23114793     Owner:  NLM     Status:  Publisher    
This study investigated the effects of progressive mild dehydration during cycling on whole body substrate oxidation and skeletal muscle metabolism in recreationally active men. Subjects (n=9) cycled for 120 min at ~65% VO2peak (22.7°C, 32% RH) with water to replace sweat losses (HYD) or without fluid (DEH). Blood samples were taken at rest and every 20 min and muscle biopsies were sampled at rest, 40, 80, and 120 min of exercise. Subjects lost 0.8%, 1.8% and 2.7% BM after 40, 80 and 120 min of cycling in the DEH trial while sweat loss was not significantly different between trials. HR was greater in the DEH trial from 60-120 min and Tc was greater from 75-120 min. RPE was higher in the DEH trial from 30-120 min. There were no differences in VO2, RER, total CHO oxidation (HYD, 312 ± 9 vs. DEH, 307 ± 10 g) or sweat rate between trials. Blood [La] was significantly greater in the DEH trial from 20-120 min with no difference in plasma [FFA] or [EPI]. Glycogenolysis was significantly greater (24%) over the entire DEH vs. HYD trial (433 ± 44 vs. 349 ± 27 mmol/kg dm). In conclusion, dehydration of <2% BM elevated physiological parameters and perceived exertion, as well as muscle glycogenolysis during exercise without affecting whole body carbohydrate oxidation.
Heather M Logan-Sprenger; J F Heigenhauser G; Graham L Jones; Lawrence L Spriet
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-30
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-11-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada.
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