Effects of carbohydrate and electrolyte solution replacement on metabolic and hormonal responses after a moderate endurance run in hot outdoor conditions.
- VernacularTitle:暑熱環境下における持久走運動時水分摂取の影響 糖・脂質および水・電解質代謝におよぼす糖‐電解質含有溶液摂取の影響
- Author:
MASATO SUZUKI
;
TOUKO SHIMIZU
;
NORIKO KAWABE
;
KATSUHIKO MACHIDA
;
MASAKI KIMURA
;
MASATOSHI SHIOTA
- Publication Type:Journal Article
- Keywords:
hot environment;
sports beverage;
endurance run;
plasma volume;
plasma cortisol
- From:Japanese Journal of Physical Fitness and Sports Medicine
1998;47(4):427-441
- CountryJapan
- Language:Japanese
-
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 (Copt) with no fluid intake, 2) an experiment with 500 ml of tap water (WI), and 3) an experiment with 500 ml 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 VO2max. 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 2 nd 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.
