Abstract
The mechanical property of the relationship between force and velocity (F-V) was studied on leg extensor in child, adults and athletes by isotonic load apparatus mentioned in previous report. The results were as follows : 1. The maximum velocity of child was 75.5% against adult and 22.2% in maximum isometric strength. It's difference of F-V relation became greater with increase of force (load). 2. Jumper showed higher maximum mechanical power in average than that of sprinter, however, the maximurn velocity and the maximum strength of jumper were lower than sprinter. 3. It is of interest that jumper showed higher ratios of force against the maximum strength and his body weight than those of sprinter at just point of the maximum power, which values are the same for both subjects. However, sprinter showed higher ratio of velocity against the maximum than that of jumper. 4. Excellent performer showed higher power and isometric strength than those of average gymnasts. 5. The maximum strength, maximum velocity and maximum mechanical power of athletes of various kinds of sports were studied and compared with each other on male and female.
