Document Detail

Carbohydrate loading and metabolism during exercise in men and women.
MedLine Citation:
PMID:  7615443     Owner:  NLM     Status:  MEDLINE    
During endurance exercise at approximately 65% maximal O2 consumption, women oxidize more lipids, and therefore decrease carbohydrate and protein oxidation, compared with men (L.J. Tarnopolsky, M.A. Tarnopolsky, S.A. Atkinson, and J.D. MacDougall. J. Appl. Physiol. 68: 302-308, 1990; S.M. Phillips, S.A. Atkinson, M.A. Tarnopolsky, and J.D. MacDougall. J. Appl. Physiol. 75: 2134-2141, 1993). The main purpose of this study was to examine the ability of similarly trained male (n = 7) and female (n = 8) endurance athletes to increase muscle glycogen concentrations in response to an increase in dietary carbohydrate from 55-60 to 75% of energy intake for a period of 4 days (carbohydrate loading). In addition, we sought to examine whether gender differences existed in metabolism during submaximal endurance cycling at 75% peak O2 consumption (VO2 peak) for 60 min. The men increased muscle glycogen concentration by 41% in response to the dietary manipulation and had a corresponding increase in performance time during an 85% VO2 peak trial (45%), whereas the women did not increase glycogen concentration (0%) or performance time (5%). The women oxidized significantly more lipid and less carbohydrate and protein compared with the men during exercise at 75% VO2-peak. We conclude that women did not increase muscle glycogen in response to the 4-day regimen of carbohydrate loading described. In addition, these data support previous observations of greater lipid and lower carbohydrate and protein oxidation by women vs. men during submaximal endurance exercise.
M A Tarnopolsky; S A Atkinson; S M Phillips; J D MacDougall
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  78     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1995 Apr 
Date Detail:
Created Date:  1995-08-18     Completed Date:  1995-08-18     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1360-8     Citation Subset:  IM    
Department of Pediatrics, McMaster University Medical Center, Hamilton, Ontario, Canada.
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MeSH Terms
Blood Glucose / metabolism
Dietary Carbohydrates / administration & dosage*,  metabolism
Exercise / physiology*
Fatty Acids, Nonesterified / blood
Glycogen / metabolism*
Muscle, Skeletal / metabolism*
Oxygen Consumption
Physical Endurance / physiology
Potassium / blood
Respiratory Function Tests
Sex Factors
Urea / blood,  urine*
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Fatty Acids, Nonesterified; 57-13-6/Urea; 7440-09-7/Potassium; 9005-79-2/Glycogen

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