The Combined Effects of Exercise and Post Dehydration Water Drinking on Plasma Argenine Vasopressin, Plasma Osmolality and Body Temperature in Healthy Males

The purpose of this study was to investigate the effect of exercise and post dehydration water drinking on variations in plasma arginine vasopressin (pavp), plasma osmolality (posm) and tympanictemperature (ttym) in healthy males.materials and methods: eight healthy young males (27.4+/-0.8 yrs old) volunteered for the study. they performed constant work exercise, ata rate of 60 rpm at 50% of individual work load for v02 peak for 30 minutes. six blood samples (at minutes 0, 15 and 30 during exercise and at minutes 3, 15 and 30 after termination of exercise) were obtained through an indwelling venous cannula. plasma concentrations for na+,and avp were determined. p osm was calculated using na+ concentrations. simultaneous variations in ttym were also determined.results: our results demonstrated a positive correlation between increase in pavp and both poem and ttym during exercise but not during the recovery period. when exercise was combinedwith water drinking a fast and significant suppression in pavp occurred (p<0.05). conclusions: these results suggest that poem and ttym have no significant effect on avp secretion post exercise, and thus other factors must be involved in avp secretion during post exercise recoveryperiod.