Effects Of Carbohydrate-Electrolyte Solution Supplementation On Fluid Retention And Aerobic Capacity After Exhaustive Exercise

Abstract

Rehydration, or restoration of fluid spaces, is important when exhaustive endurance exercise (EEE) has compromised hydration status. Previous studies only investigated the effects of carbohydrate-electrolyte solution (CE) supplementation to facilitate replacement after exercise induced dehydration. CE supplementation for 1 hour before and 1 hour after EEE may play an important role in fluid retention and enhancing aerobic capacity. PURPOSE: To examine the effects of CE supplementation on fluid retention and aerobic capacity after EEE. METHODS: In a double-blind, crossover and counterbalanced designed study, nineteen health male participants were asked to intake ORS-SH@, an oral rehydration solution, (150 mL four times within an hour) or placebo (water) for 1 hour before and 1 hour after EEE. All participants completed graded exercise test to exhaustion on treadmill for determination of maximal oxygen consumption (VO2max) before supplementation, and then completed the exhaustive endurance exercise test at the intensity of 70% VO2max for 60 min. Then, the exercise intensity increased at 90% VO2max until exhaustion after supplementation. The average heart rate, maximal heart rate, running time to exhaustion and peak oxygen uptake were recorded during the exercise period. The body weight was recorded 15-min, 30-min, 45-min and 60-min of after EEE to calculate the dehydration rate and beverage hydration index (BHI). RESULTS: The dehydration rates in participants with ORS-SH@ treatment at 15-min, 30-min and 45-min of after EEE were significantly lower than with placebo treatment (-1.77±0.50% vs. -2.06±0.66%; -1.69±0.54% vs. -1.95±0.66%; -1.48±0.51% vs. -1.76±0.65%, respectively, p < .05). In addition, the BHI in participants with ORS-SH@ treatment at 15-min, 30-min and 45-min of after EEE (1.19±0.36, 1.22±0.43 and 1.27±0.54) were significantly higher than with placebo treatment (p < .05). However, there were no significant differences in other variables between treatments. CONCLUSIONS: ORS-SH@ supplementation can effectively enhance fluid retention after EEE. However, ORS-SH@ supplementation had no benefits on aerobic capacity. Supported by Panion & BF Biotech Inc. (Grant No: A-107-077)