Reliability of ball speed in speed radar gun measurement

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  • スピードガン計測におけるボールスピードの信頼性
  • スピードガン ケイソク ニ オケル ボール スピード ノ シンライセイ

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Abstract

The purpose of this study is to clarify the reliability of ball speed in speed radar gun measurement. Intraclass correlation coefficient (ICC) was designed to assess consistency between speed radar gun and picture analysis measurements. The ICC was calculated using random-effects model of two-way analysis of variance. One male university baseball pitcher participated in the experiment. The subject was required to pitch the ball five times at the subjective efforts of 60% or 70%. The ball speed (initial velocity) of each trial was measured simultaneously using both speed radar gun and high-speed video camera (250 frames/s). The speed radar gun was placed at distance of 22m from the subject (1.6m height above the ground) on the extension of pitcher's plate and home base. The pitching motion including the ball was filmed using high-speed video camera positioned at 40m on the right hand side of the subject. The ICC for the ball speed between speed radar gun and picture analysis measurements was 0.94 (SEM=0.44). This result indicated that the consistency of the ball speed between two measuring method is very high, and if the ball speed calculated by picture analysis considers as the actual (or approximate actual) value, the ball speed in speed radar gun measurement has high reliability.

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KJ00005444963

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