The present study was done to investigate the effects of exercise intensity on renal function. Using a treadmill, exercise intensity of 40, 50, 82 and 100% VO₂max were employed in five healthy male volunteers (25.4±4.8 yrs), with the duration of exercise being 20 min in each case except for 100% VO₂max (15~17 min). Each of the above exercise loads was also undertaken after 10-14h abstinence from food and water on a different day.
　Plasma renin activity (PRA), angiotensin II (Ang II), aldosterone (Ald) concentrations, blood pressure, urinary proteins (total protein, β₂ microglobulin), creatinine clearance (Ccr) and microscopic urinalysis of organic segments were observed before and after, and at 30 and 120 min after exercise.
　Remarkable increases in plasma Ang II and aid concentrations and decrease in Ccr were observed after 100% and 82% VO₂max exercise. Urinary excretions of total protein and β₂M increased at 30min after 82% and 100%VO₂max.
　The exercise intensities less than 50%VO₂max had no effects on the parameters of renal function. renal function during exercise, and less than moderate intensity had no effects on the renal function.

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