The purpose of the present investigation was to explore whether and how the amplitude and/or duration parameters of anticipatory postural adjustments (APAs) affect the upward propulsive force during rising on tiptoes from upright standing position. These results suggest that the amplitude parameters of the APAs associated with rising on tiptoes are dependent on the upward propulsive force, and that APAs may be directly involved not only with compensation of postural disturbance but also with increasing performance of the focal movement.

It is generally known that both the duration and amplitude parameters of the anticipatory postural adjustments (APA) in the sagittal plane co-vary with the progression velocity in step or gait initiation. The purpose of this study is to elucidate how the duration and/or amplitude parameters of the APA are associated with the performance of the initiation of a single step forward in cases where the step displacement of the center of body mass are strictly regulated. Seven male subjects performed the initiation of a single step at two speeds (as fast as possible, F; normal speed, N). The APA amplitudes in the F condition showed significantly higher values than those in the N, while the APA durations showed no significant difference between the F and N conditions under the biomechanical constraints. The present results suggest that the central nervous system might scale the APA amplitudes and durations according to the intended forward velocity and the forward displacement of the center of body mass in step initiation, respectively.

本研究では，事例研究として，女子エリート跳躍競技者1名の4年間の試合シーズンにおけるトレーニングプログラムと試合記録のデータを追跡集計し，試合前のテーパリングの効果的な導入法について検討することを目的とした．
　エリート女子跳躍選手において，試合前のテーパリング方策は試合パフォーマンスに影響する要因であることが示唆され，特に跳躍記録を左右する助走速度を決定するトップスピード量の導入について，テーパリング・プログラム設定の有用性の根拠が得られたことは，現場での処方に寄与するデータになると考えられた．ただし，日本の女子跳躍競技にはエリートレベル選手は国内に若干名しか存在せず，本研究では1名しか対象者とすることができなかった．この手法での対象数を増やして，さらに検証し普遍的なテーパリング法則を導くことが急務である．