Abstract
A study was carried out to investigate the effect of exercise intensity on urinary nitrogen excretion (UN), dermal nitrogen loss (DN) and nitrogen balance (NB). Three experimental periods were planned: control (C), 60% Vo2max exercise (60%E) and 80%Vo2max exercise (80 %E) periods. On the experimental days in each exercise period, exercise for 30min was conducted with a bicycle ergometer twice a day. UN values were of the order 80%E>C>60% E on average, but showed no signifieant differences. DN values were significantly higher in 60%E and in 80%E compared with that in the C period. No significant difference was found between the 60%E and 80%E periods. The sum of UN and DN was of the order 80%E>60%E>C, with significant differences between the C and 60%E periods. NB was negative in all three periods, but that in the 80%E period was more negative than in the other two periods.
