Rehydration after Exercise with Fresh Young Coconut Water, Carbohydrate-Electrolyte Beverage and Plain Water

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概要

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• This is to cross-over study to assess the effectiveness of fresh young coconut water (CW), and carbohydrate-electrolyte beverage (CEB) compared with plain water (PW) for whole body rehydration and blood volume (BV) restoration during a 2 h rehydration period following exercise-induced dehydration. Eight healthy male volunteers (mean age and VO_<2max>, of 22.4 ± 3.3 years and 45.8 ± 1.5 ml min kg^<-1> respectively) exercised at 60% Of VO_<2max> in the heat (31.1 ± 0.03℃, 51.4 ± 0.1% rh) until 2.78 ± 0.06% (1.6 ± 0.1 kg) of their body weight (BW) was lost. After exercise, the subjects sat for 2 h in a thermoneutral environment (22.5 ± 0.1℃; 67.0 ± 1.0% rh) and drank a volume of PW, CW and CEB on different occasions representing 120% of the fluid loss. A blood and urine sample, and the body weight of each subject was taken before and after exercise and at 30 min intervals throughout a rehydration period. Each subject remained fasted throughout rehydration. Each fluid was consumed in three portions in separate trials representing 50% (781 ± 47 ml), 40% (625 ± 33 ml) and 30% (469 ± 28 ml) of the 120% fluid loss at 0, 30 and 60 min of the 2 h rehydration period, respectively. The drinks given were randomised. In all the trials the subjects were somewhat hypohydrated (range 0.08-0.18 kg BW below euhydrated BW; p>0.05) after a 2 h rehydration period since additional water and BW were lost as a result of urine formation, respiration, sweat and metabolism. The percent of body weight loss that was regained (used as index of percent rehydration) during CW, PW, and CEB trials was 75 ± 5% 73 ± 5% and 80 ± 4% respectively, but was not statistically different between trials. The rehydration index, which provided an indication of how much of what was actually ingested was used for body weight restoration, was again not different statistically between trials (1.56 ± 0 14, 1,36 ± 0.13 and 1.71 ± 0.21 for CW, CEB and PW respectively). Although BV restoration was better with CW, it was not statistically different from CEB and PW. Cumulative urine output was similar in all trials. There were no difference at any time in serum Na^+ and Cl^-, serum osmolality, and net fluid balance between the three trials. Urine osmolality decreased after 1 h during the rehydration period and it was lowest in the PW trial. Plasma glucose concentrations were significantly higher compared with PW ingestion when CW and CEB were ingested during the rehydration period. CW was significantly sweeter, caused less nausea, fullness and no stomach upset and was also easier to consume in a larger amount compared with CEB and PW ingestion. In conclusion, ingestion of fresh young coconut water, a natural refreshing beverage, could be used for whole body rehydration after exercise. J Physiol Anthropol 21 (2): 93-104, 2002 http://www.jstage.jst.go.jp/en/

• 日本生理人類学会の論文

著者

• Saat Mohamed

  九州大学 人間工学

• Ismail Mohamed

  Department Of Physiology:department Of Ergonomics Faculty Of Design Kyushu University

• Sirisinghe Roland

  Department Of Physiology

• SINGH Rabindarjeet

  Sports Science Unit, School of Medical Sciences, Universiti Sains Malaysia

• Saat Mohamed

  Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia (USM)

• Nawawi Mohd

  Sport Science Unit, School of Medical Science, Universiti Sains Malaysia

• Nawawi Mohd

  Sport Science Unit School Of Medical Science Universiti Sains Malaysia

• Saat Mohamed

  Department Of Physiology School Of Medical Science Universiti Sains Malaysia

• Saat Mohamed

  Department Of Environmental Physiology Institute Of Tropical Medicine Nagasaki University

• Sirisinghe Roland

  Department Of Physiology School Of Medical Science Universiti Sains Malaysia Malaysia

• Singh Rabindarjeet

  Sports Science Unit School Of Medical Sciences Universiti Sains Malaysia

関連論文

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