THE EFFECT OF KARATE STANCE ON ATTACK-TIME: PART I - JAB

Abstract

This report presents an empirical study of the effect of stance on attack-time during the movement of a jab in a simulated karate contest. A t-test and linear regression method are used to analyze the data collected from 24 elite karate competitors. The results show the larger the impulse generated by lower extremities, the shorter the attack-time in a jab movement. Comparing with 5:5 stance, 7:3 stance exhibits significant shorter attack-time in the Hest and randomized paired comparison analysis. It can be concluded that the impulse generated in a jab movement contributes to the body CG and hand-movement speeds. And the training in strengthening the impulse-generated leg and the duration of net GRF should be examined with the aid of a force plate. Similar analysis for various stances can also be applied when hand-movement is the key factor in some sports.