Abstract

This investigation evaluated the effects of beverage carbonation and carbohydrate (CHO) content on fluid replacement following exercise/thermal dehydration. On four occasions separated by at least 7 days, eight healthy men cycled at 50 of VO2max in a hot environmental chamber (40 degrees C, 40 relative humidity) until a weight loss of 4.12 +/- 0.22 was attained. In the subsequent four hours, subjects ingested one of four solutions at 15-min intervals. The total volume ingested equalled that lost during dehydration. The solutions were administered in randomized order and varied in their carbonation and carbohydrate (CHO) content: 1. CK: carbonated 10 glucose-fructose solution, 2. NCK: non-carbonated 10 glucose-fructose solution, 3. CNK: carbonated non-caloric solution, and 4. NCNK: non-carbonated non-caloric solution. Plasma volume changes, total plasma protein concentration, plasma osmolality, and the plasma glucose concentration were determined at rest before and after dehydration, and at 30, 90, 150, and 240 min of recovery. The results suggest that solutions which are carbonated and/or contain 10 CHO are as effective as non-carbonated and non-CHO solutions with regard to fluid replacement over four hours. Verf.-Referat