Failure of low dose carbohydrate feeding to attenuate glucoregulatory hormone responses and improve endurance performance.

W. A. Burgess, J. M. Davis, W. P. Bartoli, J. A. Woods

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of ingesting a low dose of CHO on plasma glucose, glucoregulatory hormone responses, and performance during prolonged cycling were investigated. Nine male subjects cycled for 165 min at approximately 67% peak VO2 followed by a two-stage performance ride to exhaustion on two occasions in the laboratory. Every 20 min during exercise, subjects consumed either a flavored water placebo (P) or a dilute carbohydrate beverage (C). Blood samples were collected immediately before, every 20 min throughout, and immediately after exercise. Plasma was analyzed for glucose, lactate, free fatty acids (FFA), and various glucoregulatory hormones. VO2, RER, heart rate, perceived exertion, and exercise performance were also measured. Lactate, FFA, epinephrine, norepinephrine, ACTH, cortisol, and glucagon increased with exercise whereas glucose and insulin decreased (p < or = .05). Except for a small difference in glucose at 158 min of exercise and at exhaustion, no significant differences were found between drinks for any of the variables studied (P > or = .05). Ingestion of 13 g carbohydrate per hour is not sufficient to maintain plasma glucose, attenuate the glucoregulatory hormone response, and improve performance during prolonged moderate intensity cycling.

Original languageEnglish (US)
Pages (from-to)338-352
Number of pages15
JournalInternational journal of sport nutrition
Volume1
Issue number4
DOIs
StatePublished - Dec 1991
Externally publishedYes

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science
  • Endocrinology
  • Public Health, Environmental and Occupational Health

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