| Carbohydrate loading and metabolism during exercise in men and women. | |
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MedLine Citation:
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PMID: 7615443 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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M A Tarnopolsky; S A Atkinson; S M Phillips; J D MacDougall |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 78 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1995 Apr |
Date Detail:
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Created Date: 1995-08-18 Completed Date: 1995-08-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1360-8 Citation Subset: IM |
Affiliation:
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Department of Pediatrics, McMaster University Medical Center, Hamilton, Ontario, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Biopsy Blood Glucose / metabolism Dietary Carbohydrates / administration & dosage*, metabolism Exercise / physiology* Fatty Acids, Nonesterified / blood Female Glycogen / metabolism* Humans Male Muscle, Skeletal / metabolism* Oxygen Consumption Physical Endurance / physiology Potassium / blood Respiratory Function Tests Sex Factors Urea / blood, urine* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Dietary Carbohydrates; 0/Fatty Acids, Nonesterified; 57-13-6/Urea; 7440-09-7/Potassium; 9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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