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BACKGROUND OF THE PROBLEM
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73 children adjacent stage advanced throwing aligned but independent arm-trunk development arm-trunk relationship ball release behavior block rotation child components developmental level developmental psychology Differentiated rotation Ekern exhibited Extension and/or flexion film forceful overarm throw Forearm lags fully Forearm lags partially forward arm movement forward movement forward to ball Glassow Hanson horizontal adduction Humerus aligned Humerus lags humerus moves forward Humerus oblique hypothesized stages intra-task motor intra-task stage lateral flexion lateral rotation Leme longitudinal major arm-trunk stage major stages ment minor modal stage motor development motor learning motor task number of trials observed pelvic rotation pelvic-spinal steps pelvis and spine pelvis stationary performance plane horizontally aligned reached front facing reverse swing right angle rotation forward shoulder spinal rotation Spinal then pelvic stage theory stage variability patterns stage-variable children stride subjects tion trunk action trunk movement trunk rotation Turiel Type University of Wisconsin-Madison velocimeter vic-spinal Wild Wild's