[The effects of jumping exercise on bones.].

Strain rate and strain magnitude are important factors when considering osteogenic response to the bone strain imposed by mechanical stress. Jumping is a high-impact exercise that includes these factors. Ten to twenty jumping repetitions per day can increase bone mass and strength. However, the returns diminish with more than ten jumping repetitions because mechanosensitivity declines. Jumping exercise increases bone strength and bone diameters in particular. Although jump training is not suitable for older people, jump training could be an effective tool to prevent osteopenia in younger age groups.