Plasma volume, renin, and vasopressin responses to graded exercise after training

fects of exercise training on fluid shifts and endocrine responses during exercise, plasma volume (PV), renin activity (PRA), osmolality (Osm), and vasopressin (PVP) concentrations were measured in venous blood obtained during rest and sitting ergometer exercise (100, 175, and 225 W) from four men before and after training on a cycle ergometer [2 h/day for 8 days, T,ji, 25”C, at 65 % of their maximal 02 uptake (J?o~,,,,)]. After training, resting PV increased by 12.3 % (440 ml, P < 0.05) and