Salivary testosterone of sprinters and long distance runners be fore and after training sessions and during the recovery period was measured. The study found that salivary testosterone of sprinters significantly decreased after large and medium training loads, and returned to original level after l2 hours. Salivary tesosterone of long distance runners increased after small loading volume, but significant1y decreased after 1arge and medium loading vo1ume, and returned to original level after 6 hours.Change of salivary testosterone of men in a day showed certain regularity, being high in the morning and low in the afternoon. The change of salivary testosterone observed in this study was caused by exercise. Salivary testosterone of sprinters and long distance runners be fore and after training sessions and during the recovery period was. The study found that salivary testosterone of sprinters significantly decreased after large and medium training loads, and returned to original level after 12 hours. Salivary tesosterone of long distance runners increased after small loading volume, but significantly decreased after 1arge and medium loading vo1ume, and returned to original level after 6 hours. Change of salivary testosterone of men in a day showed certain regularity, being high in the morning and low in the afternoon. The change of salivary testosterone observed in this study was caused by exercise.