Document Detail

Carbohydrates and physical/mental performance during intermittent exercise to fatigue.
MedLine Citation:
PMID:  11932585     Owner:  NLM     Status:  MEDLINE    
PURPOSE: This study was designed to examine the effects of carbohydrate-electrolyte ingestion on physical and mental function associated with the performance of intermittent high-intensity (IHI) exercise similar to many common competitive sporting events. METHODS: Physically active men (N = 5) and women (N = 5), experienced in competitive soccer or basketball, completed three practice sessions and two experimental trials of an IHI shuttle running protocol designed to closely stimulate the demands of an actual competitive sporting event such as basketball. The experimental trials consisted of four 15-min quarters (QTR) of intermittent shuttle running at various percentages of .VO(2max) (walking, jogging, running, sprinting and jumping), separated by a 20-min halftime rest period (HALF) and followed by a shuttle run to fatigue. Various tests of physical and mental function (shuttle run to fatigue, 20-m maximal sprint, 10-repetition maximal vertical jumping, whole body motor skill test (MS-Test), profile of mood states (POMS), and Stroop Color-Word Test) were performed throughout the experimental trial. Carbohydrate-electrolyte (CHO) or placebo (P) drinks were consumed before exercise (5; 6% solution) and at halftime (5; 18% solution). Smaller volumes (3; 6% solution) were given after QTR-1, HALF, QTR-3, and QTR-4. RESULTS: CHO ingestion resulted in a 37% longer run time to fatigue and faster 20-m sprint time during QTR-4 (P < 0.05). MS-Test performance was also improved during the latter stages of exercise along with self-reported perceptions of fatigue (subscale of POMS) (P < 0.05) in CHO versus P. CONCLUSION: These results suggest a beneficial role of carbohydrate-electrolyte ingestion on physical and mental function during intermittent exercise similar to that of many competitive team sports.
Ralph S Welsh; J Mark Davis; Jean R Burke; Harriet G Williams
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  34     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-04-04     Completed Date:  2002-04-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  723-31     Citation Subset:  IM; S    
Department of Exercise Science, Norman J. Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA.
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MeSH Terms
Blood Glucose
Carbohydrates / administration & dosage*
Electrolytes / administration & dosage
Exercise / physiology*
Fatigue / physiopathology*
Fatty Acids, Nonesterified / blood
Insulin / blood
Motor Skills / physiology*
Psychomotor Performance / physiology*
Sports / physiology*
Reg. No./Substance:
0/Blood Glucose; 0/Carbohydrates; 0/Electrolytes; 0/Fatty Acids, Nonesterified; 11061-68-0/Insulin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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