caa a22 4500 46905476X CHVBK 20180323132840.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00243512 doi (NATIONALLICENCE)springer-10.1007/BF00243512 Fluid replacement beverages and maintenance of plasma volume during exercise: role of aldosterone and vasopressin [Elektronische Daten] [David Criswell, Kevin Renshler, Scott Powers, Richard Tulley, Michael Cicale] Summary: Previous experiments have demonstrated that consumption of a glucose polymer-electrolyte (GP-E) beverage is superior to water in minimizing exercise-induced decreases in plasma volume (PV). We tested the hypothesis that elevated plasma concentrations of vasopressin and/or aldosterone above that seen with water ingestion may explain this observation. Six trained cyclists performed 115 min of constant-load exercise (approximately 65% of maximal oxygen consumption) on a cycle ergometer on two occasions with 7 days separating experiments. Ambient conditions were maintained relatively constant for both exercise tests (29-30° C; 58-66% relative humidity). During each experiment, subjects consumed 400 ml of one of the following beverages 20 min prior to exercise and 275 ml immediately prior to and every 15 min during exercise: (1) distilled water or (2) GP-E drink contents = 7% carbohydrate (glucose polymers and fructose; 9 mmol·1−1 sodium; 5 mmol·1−1 potassium; osmolality 250 mosmol·1−1). No significant difference (P>0.05) existed in mean skin temperature, rectal temperature, oxygen consumption, carbon dioxide production or the respiratory exchange ratio between treatments. Further, no significant differences existed in plasma osmolality and plasma concentrations of sodium, potassium, chloride or magnesium between treatments. Plasma volume was better maintained (P<0.05) in the GP-E trial at 90 and 120 min of exercise when compared to the water treatment. No differences existed in plasma levels of vasopressin or aldosterone between treatments at any measurement period. Further, the correlation coefficients between plasma concentrations of vasopressin and aldosterone and change in PV during exercise were 0.42 (P<0.05) and 0.16 (P>0.05), respectively. Therefore, although these experiments support the notion that a GP-E beverage is superior to water in minimizing exercise-induced disturbances in PV during prolonged exercise, the mechanism to explain this observation is not due to differences in plasma concentrations of vasopressin or aldosterone alone. Springer-Verlag, 1992 Plasma volume nationallicence Fluid replacement nationallicence Prolonged exercise nationallicence Hypovolemia nationallicence Hydration nationallicence Criswell David Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut Renshler Kevin Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut Powers Scott Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut Tulley Richard Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut Cicale Michael Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/5(1992-11-01), 445-451 0301-5548 65:5<445 1992 65 421 https://doi.org/10.1007/BF00243512 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00243512 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Criswell David Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Renshler Kevin Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Powers Scott Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Tulley Richard Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Cicale Michael Keith Wheeler Center for Exercise Science, Departments of Exercise and Sport Sciences, Physiology, and Medicine, University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/5(1992-11-01), 445-451 0301-5548 65:5<445 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer