Effect of high and low rates of fluid intake on post-exercise rehydration.
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.
Kovacs
Eva M R
EM
Department of Human Biology at Maastricht University, The Netherlands.
Schmahl
Regina M
RM
Senden
Joan M G
JM
Brouns
Fred
F
D000328:Adult; D001628:Beverages; D001642:Bicycling; D001835:Body Weight / Q000502:physiology; D018592:Cross-Over Studies; D003681:Dehydration / Q000097:blood / Q000628:therapy* / Q000652:urine; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004326:Drinking; D004573:Electrolytes / Q000008:administration & dosage; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005440:Fluid Therapy / Q000379:methods*; D006801:Humans; D007700:Kinetics; D008297:Male; D009994:Osmolar Concentration; D010953:Plasma Volume; D012964:Sodium / Q000032:analysis / Q000378:metabolism; D014554:Urination / Q000502:physiology*; D014882:Water-Electrolyte Balance
D004040:Dietary Carbohydrates; D004573:Electrolytes; D012964:Sodium