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Percentage of volume intake for rehydration after exercise-induced dehydration
  1. Ishak Ismail1,
  2. Rabindarjeet Singh2
  1. 1Department of Physical Education and Health, Teachers Education Institute, Sultan Mizan Campus, Kota Putera, Terengganu, Malaysia
  2. 2Advance Medical and Dental Institute, USM, Penang, Malaysia

Abstract

The present cross over study assessed the percentage of dehydration and effectiveness of 120% rehydration (R) with sports drink (SD) and plain water (PW) on whole body rehydration (R), plasma volume (PV) restoration after exercise-induced dehydration. Ten healthy male subjects (age range, 19–27 years) were exercised at 65% of VO2max at an environmental temperature of 32.06±0.02°C on which relative humidity of 67.32±0.17% for 90-min until 3.08±0.04% (1.83±0.10 kg) of their body weight loss. After which, the subjects move to the thermo neutral environment (21.2±0.3°C) and seated for 30 min prior to begin the 2-h R period. During R, subjects drank either SD or PW representing 120% of the fluid lost divided in three boluses representation 50% (915±54 ml), 40%(732±37 ml) and 30% (556±35 ml) at 0, 30, 60 min, respectively. In the entire trials subjects were somewhat hypo hydrated (range 0.32–0.52 kg below initial body weight) after completing the 2-h R period. The percent body weight loss that was regained (used as index of percent rehydration) during SD and PW was 68±2% and 58±2%, respectively, with significantly (p<0.05) better R with SD compared with PW. The rehydration index for SD was significantly lower than PW (p<0.01). PV was restored similarly to euhydration levels after 2-h of R with SD but was significantly lower (p<0.05) with PW trials. Cumulative urine output was significantly higher for PW when compare to SD (p<0.05). Serum Cl, Na and K were significantly higher with SD (p<0.05) and urine osmolality of PW trial were significantly lower (p<0.05) than SD at the end of 2-h R period. Plasma glucose concentration were significantly higher when SD was ingested compared to PW (p<0.01). In conclusion, ingesting the volume of 120% of losses still under hypohydrated because of urine production and SD was better than PW for rehydration after exercise-induced dehydration.

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