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[Purpose] We divided the jump action into a resting phase and a motion execution phase, so that we could shed light on each phase’s relationship with the whole body reaction time in jump. [Subjects and Methods] Whole body reaction of young subjects in their late teens was recorded with a high-speed video camera to identify moving reaction time. [Results] The results revealed a high correlation between jumping reaction time and the light stimulus to movement initiation, and the movement initiation to feet-off. Individual variation existed in neural processing velocity of movement preparation and execution, and the processing velocity was shown to reflect the whole body reaction time in jumping. [Conclusion] The outcome suggests that improvement of body performance can be achieved not only by muscle stretch and elastic energy recruitment training but also by faster neural processing.

Relationships between Whole Body Reaction Time and the Motion-silent Period and the Action Period in Jump