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International Journal of Sports Medicine 1992-Jul

Rehydration after exercise with common beverages and water.

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J González-Alonso
C L Heaps
E F Coyle

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概要

This study assessed the effectiveness of two common rehydration beverages (a caffeinated diet cola (DC) and a 6% carbohydrate-electrolyte (CE) solution) compared with water (W) for whole body rehydration, gastric emptying and blood volume (BV) restoration during a 2 h rehydration period following exercise-induced dehydration. Subjects (mean VO2max = 4.2 +/- 0.6 l.min-1.min-1; n = 19) exercised at 60-80% VO2max in the heat (32 degrees C; 40% rh) until approximately 2.5% (1.95 +/- 0.12 kg) of their body weight (BW) was lost. After exercise, the subjects sat for 2 h in a thermoneutral environment (21 degrees C; 60% rh) and drank a volume of DC, W and CE equal to the fluid lost. Fluids were consumed in two boluses averaging 1,046 +/- 198 and 912 +/- 186 ml at 0 and 45 min of the 2 h rehydration period, respectively. At the end of the rehydration period, no fluid remained in the stomach during any of the trials as indicated by epigastric impedance. However, in all the trials the subjects were somewhat hypohydrated (range 0.6-0.9 kg BW below euhydrated BW; p less than 0.05) after the 2 h rehydration period since additional water and BW were lost as a result of urine formation, respiration, sweat and metabolism. The percentage of body weight loss that was regained (used as an index of % rehydration) during DC (54 +/- 5%) was significantly lower than that of W and CE (64 +/- 5% and 69 +/- 5%, respectively; p less than 0.05; n = 10).(ABSTRACT TRUNCATED AT 250 WORDS)

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