When I perform bone evaluation by supersonic wave measurement，I only evaluate the right foot without considering the subject’s laterality，or potential differences between right and left foot bone density. Puberty is the period during which bone density rises，and during which the influence of mechanical stress is considered great，and evaluation of the right foot has been considered sufficient to clarify this effect. From the viewpoint of general health and prevention of osteoporosis we must measure one’s bone density in puberty， raise the peak bone mass，and maintain it. The present experiment was performed to clarify what kind of influence laterality of foot and exercise habits had on the bone density of the right calcaneus. Exercise habits did not have much influence on the bone density rise if the right foot was non-dominant. However，a meaningful connection was recognized between exercise habits and bone density rise if the right foot was dominant. From these results，it was thought that the measurement of calcaneus bone density by a supersonic wave method in puberty is more effective if the dominant foot is used
