Fujii Keisuke, Yoshioka Shinsuke, Isaka Tadao, Kouzaki Motoki
a Research Center of Health Physical Fitness and Sports , Nagoya University , Nagoya , Japan.
Sports Biomech. 2015 Mar;14(1):28-44. doi: 10.1080/14763141.2015.1026931. Epub 2015 Apr 21.
We previously demonstrated the relationship between sidestepping performance and the preparatory state of ground reaction forces (GRFs). The present study investigated the effect of the preparatory state of GRFs on defensive performance in 1-on-1 subphase of basketball. Ten basketball players participated in 1-on-1 dribble game of basketball. The outcomes (penetrating and guarding) and the preparatory state of GRFs (non-weighted and weighted states, i.e. vertical GRFs below and above 120% of body weight, respectively) were assessed by separating the phases. In the non-weighted state and the weighted state to determine the outcome, the probability of successful guarding was 78.8% and 29.6%, respectively. The non-weighted state prevented delay of the defensive step in the determination phase. Both the non-weighted and weighted states, immediately before the determination phase, were likely to change to the weighted state in the determination phase; during this time, the defender's preparatory state would be destabilised, presumably by the dribbler's movement. These results revealed that the preparatory GRFs before the defensive step help to explain the outcome of the 1-on-1 subphase, and suggest a better way to prevent delaying initiation of the defensive step and thereby to guard more effectively against a dribbler.
我们之前展示了侧向移动表现与地面反作用力（GRFs）准备状态之间的关系。本研究调查了GRFs准备状态对篮球一对一阶段防守表现的影响。十名篮球运动员参加了篮球一对一运球比赛。通过划分阶段来评估结果（突破和防守）以及GRFs的准备状态（非加权和加权状态，即垂直GRFs分别低于和高于体重的120%）。在确定结果的非加权状态和加权状态下，成功防守的概率分别为78.8%和29.6%。非加权状态可防止在确定阶段防守步的延迟。在确定阶段之前，非加权和加权状态都有可能在确定阶段转变为加权状态；在此期间，防守者的准备状态可能会因运球者的移动而变得不稳定。这些结果表明，防守步之前的GRFs准备状态有助于解释一对一阶段的结果，并提出了一种更好的方法来防止防守步启动延迟，从而更有效地防守运球者。
