異なる速度の投球に対する打撃動作局面の経時変化について

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This study was purposed to know that in which hitting motion phases batters time their motions to pitches travel in hitting fast-speed and slow-speed pitches. Subjects were six experts consisiting of four male university baseball players and two male university students who had been a baseball player in his junior-high and high school days, and six novices who had a few years experiences of playing baseball in their elementary or junior-high school days. They hit pitches which were delivered with a pitching machine in following three hitting conditions. 1) Hitting 32 m/s pitches. 2) Hitting 21 m/s pitches. 3) Hitting 32 m/s and 21 m/s pitches which were mixed at random. Hitting motions were video-taped with a high-speed camera at 400 fps. Followings were suggested in investigation into change of hitting motion phases with time in hitting slow and fast speed pitches. 1) Batters delay to start bat-swing motions for timing their motions to pitches travel in hitting slow-speed pitches. 2) In hitting slow-speed pitches, novices time their motions to pitches' travel by delaying to start hitting motions. And experts time their motions to slow travels of pitches by delaying stepping motions. 3) In hitting fast-speed and slow-speed pitches which are mixed at random, batters prepare for hitting fast-speed pitches. When slow-speed pitches are delivered, novices delay to land their stepping foot on the ground and experts delay their motions after landing of stepping foot to time their swing motions to slow pitches' travels. 4) Experts'motion phases, from beginning phase of hitting motion to top of take-back motion phases, were shown earlier than novices' motion phases. It reveales that experts prepare to swing a bat earlier than novoces. Novices begin their stepping motions after pitches were released. And their top of take-back phases are shown as soon as their stepping foot are landed on the ground. Their swing motions are begun just after that. It suggests that novices are needed to respond to pitches travels before landing of stepping foot, because after landing they have to beging bat-swing motions. Experts begin their stepping motion before pitches are released. After stepping foot are landed on the gound, motion phases, such as top of take-back and beginning of swing motion, were changed at intervals. It suggests that experts can time beginning of bat-swing motions after landing of stepping foot by early stepping motion, and their stepping styles make themselves to respond pitches' travels after landing of stepping foot on the ground.
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異なる速度の投球に対する打撃動作局面の経時変化について

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