Effect of high and low rates of fluid intake on post-exercise rehydration

E.M.R. Kovacs, R.M. Schmahl, J.M.G. Senden, F.J.P.H. Brouns

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Abstract

The effect of a high (H) and a low (L) rate of post-exercise fluid consumption on plasma volume and fluid balance restoration was investigated. Eight well-trained cyclists were dehydrated at 3% of body weight (BW) by cycling at 28 degrees C. During the recovery period, they ingested a carbohydrate-electrolyte solution in a volume equivalent to 120% of BW loss. Randomly, they ingested 60%, 40%, and 20% in the 1st, 2nd, and 3rd hours of the recovery period, respectively (H), or 24% x h(-1) during 5 hours (L). BW loss was similar for both trials and resulted in a total drink intake of 2.6 +/- 0.1 kg. Urine output in H exceeded significantly that of L in the 2nd and 3rd hours. This was reversed in the 5th and 6th hours. Plasma volume and fluid balance increased more rapidly in H compared to L. After 6 hours this difference disappeared. It is concluded that H results in a faster rate of plasma volume and fluid balance restoration compared to L, despite a temporary large urine output.
Original languageEnglish
Pages (from-to)14-23
Number of pages10
JournalInternational Journal of Sport Nutrition
Volume12
Issue number1
DOIs
Publication statusPublished - 1 Jan 2002

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