Hide All

1996 Publications

Fluid Balance and Renal Response Following Dehydrating Exercise in Well-Trained Men and Womenby Nina S. Stachenfeld, Gilbert W. Gleim, Paul M. Zabetakis, James A. NicholasThe Nicholas Institute of Sports Medicine and Athletic Trauma and Nephrology Section, Lenox Hill Hospital, New York, NY - last modified 2013-02-09 00:00
Eur J Appli Phvsiol (1996) 72: 468-477


We examined the recovery of plasma volume, plasma osmolality, renal water and sodium handling and fluid-regulating hormones to dehydrating exercise in well-trained women and compared them to men. Ten male and eight female athletes cycled at anaerobic threshold at an ambient temperature of 32 deg. C until dehydration by 3% of their body mass (Mb).

After exercise, they drank water equal to 1% Mb and rested for 240 min. Plasma renin activity (PRA), serum aldosterone [ALDO]s, plasma arginine vasopressin [AVP]pl, norepinephrine concentrations and plasma osmolality (OSMpl) were determined at baseline, end of exercise, 30, 60, 120 and 240 min postexercise. Urine was collected at baseline, end of exercise, 60, 120 and 240 min postexercise.

Renal free water and sodium handling were assessed. The recovery of OSMpl and plasma volume occurred within the first 60 min of recovery and at similar rates between the groups. However, women had lower PRA at the end of exercise (P = 0.05), an earlier recovery of [ALDO]s, and a slower [AVP]pl recovery. Overall fluid balance was similar between the men and women, as were the early recovery of renal free water clearance (CH2O).

During the last 120 min of recovery CH2O was more negative (greater water reabsorption) and fractional sodium excretion was increased in the women com- pared to the men. Despite small differences in sodium and water reabsorption following dehydration, it appears from other study that recovery from dehydrating exercise in well-trained men and women is remarkably similar