Effects of carbohydrate and electrolyte solution replacement on metabolic and hormonal responses after a moderate endurance run in hot outdoor conditions

Masato Suzuki, Touko Shimizu, Noriko Kawabe, Katsuhiko Machida, Masaki Kimura, Masatoshi Shiota

Research output: Contribution to journalArticle

Abstract

The effect of ingestion of a chilled carbohydrate and electrolyte solution on metabolic and hormonal responses and water-electrolyte balance was studied after two 5-km runs in hot outdoor conditions (Temp, 30.6-30.9°C ; humidity, 61.3-62.4%). Eight healthy females (mean age 21.8 years) participated in : 1) a control experiment (Cont) with no fluid intake, 2) an experiment with 500ml of tap water (WI), and 3) an experiment with 500ml of sports beverage (SB) containing carbohydrate and electrolytes each of which were given after the 1st 5-km run, followed by a second 5-km run with an equivalent to 68.7-72.3% of V̇O2max. In the Cont, decreases in %ΔPV and blood glucose (BS) and increases in serum osmolality (Sosm), free fatty acid (sFFA) and plasma hormone concentrations related to regulation of the water-electrolyte balance in the body persisted after the 2nd run. The intake of the sports beverage prevented hypoglycemia and ketoacidosis, as shown by an increase in sFFA and positive results for qualitative analysis of ketone body in the urine, and quick recovery of plasma volume following an endurance run under a hot environment. This study suggests that fluid replacement with a sports beverage containing carbohydrate and electrolytes was superior to plain water or no fluid ingestion in terms of metabolic and hormonal responses and the recovery of plasma volume and elevated rectal temperature following an endurance run under hot conditions.

Original languageEnglish
Pages (from-to)427-442
Number of pages16
JournalJapanese Journal of Physical Fitness and Sports Medicine
Volume47
Issue number4
Publication statusPublished - 1998 Aug
Externally publishedYes

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Keywords

  • Endurance run
  • Hot environment
  • Plasma cortisol
  • Plasma volume
  • Sports beverage

ASJC Scopus subject areas

  • Physiology
  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

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