We sometimes hear that the muscle soreness appearance after exercise is delayed as aging. But there is no report about this fact. The purposes of this study were to make certain this fact and to investigate the relationship between the time of muscle soreness appearance and the age. The process of this study was divided into three parts. To begin with, the survey, which was designed to confirm the above-mentioned fact, was conducted on 80 men and women of 20 years and up. Secondly, perceived muscle soreness ratings following accute exercises were checked by the subjects who took part in a sport event. And finally, changes in muscle soreness levels were evaluated after some exercises which were planned to occur heavy soreness by the subjects.
　The results were summarized as follows:
　1) 90% of the subjects recognized the fact that muscle soreness was delayed as they grow older.
　2) Most of the subjects experienced muscle soreness after the acute exercise, but there was no findings which prove the relationship between the appearance time of muscle soreness and age.
　3) Muscle soreness ratings following exercise were different with the muscles and different with the kinds of exercise.
　4) The muscle soreness appearance after strenuous exercises was earlier than that after moderate or light exercises.
　These findings suggest that the delay of muscle soreness is not necessarily related to the aging. The contradiction between the results may come from the difference in kind of exercises. But longitudinal study is need to draw a conclusion.

DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE