Abstract
A spike jump in volleyball is important movement, but there are many unclear points yet. Therefore, in present study, we proposed some fundamental dynamics models using results of motion analysis to coach. Firstly, it was described that three things are clarified by using motion analysis. They are as follows: (1) only a forefoot is being used at spike jump, (2) kinetic energy of an approach run is needed to get big floor reaction force, (3) A human can accumulate elastic energy into own body. Nextly, we tried to explain some fundamental dynamic phenomena from above-mentioned results. these are "horizontal moving is changed to rotary motion", "dynamics model using spring and actuator" and "dynamic function of raising movement of arms". Finally, we discussed about relations between traditional coaching and mentioned above.
