Consistent Hand Dynamics Are Achieved by Controlling Variabilities Among Joint Movements During Fastball Pitching.
Consistent Hand Dynamics Are Achieved by Controlling Variabilities Among Joint Movements During Fastball Pitching.
复制标题
通过控制快球俯仰期间的联合运动之间的变异性，可以实现一致的手动力学。
DOI：
10.3389/fspor.2020.579377
复制
发表时间：
2020
影响因子：
2.7
通讯作者：
Morishita Y
中科院分区：
文献类型：
--
作者：
Matsuo T;Jinji T;Hirayama D;Nasu D;Katsumata Y;Morishita Y
本研究旨在确定是否利用关节运动之间的协变来稳定手的方向和运动，并确定上肢或下肢有效地利用协变。使用运动捕捉系统测量了12名熟练的棒球投手在投球过程中的关节角度。在10个成功的试验中的关节角度用于重建的运动。第一种情况下的重建运动与测量运动相同。在第二种情况下，重建的运动产生的关节角度是伪随机选择的，人为地打破了测得的关节角度组合的协变。在第三和第四个条件下，重建的运动分别与投掷臂和跨步腿中的测量角度相同的关节角度组合生成，但在其他关节角度中伪随机选择。每种条件下生成10个重建运动。计算并比较了不同条件下的手定向和运动方向的标准差（SD）。第一个条件的所有SD是最小的条件，表明在测量条件下的运动使用关节角度的协变，使手的运动稳定。结果还表明，在第四种情况下的一些SD小于第三种情况下的SD，表明下肢有效地利用了协变。这些结果意味着，它不仅是必要的，以减少每个关节的变化，但也要调节关节运动，以稳定手的方向和运动。
This study aimed to determine whether covariations among joint movements are utilized to stabilize hand orientation and movement and to determine which of the upper or lower extremities make effective use of the covariation. Joint angles during pitching were measured in 12 skilled baseball pitchers, using a motion capture system. The joint angles in 10 successful trials were used for the reconstructed motions. The reconstructed motion in the first condition was the same as for the measured motion. In the second condition, the reconstructed motion was generated with joint angles that were pseudo-randomly selected to artificially break off covariation in the measured joint-angle combination. In the third and fourth conditions, the reconstructed motions were generated with the same joint-angle combinations as the measured angles in the throwing arm and the stride leg, respectively, but pseudo-randomly selected in the other joint angles. Ten reconstructed motions were generated for each condition. Standard deviations (SDs) of hand orientation and movement direction were calculated and compared among the conditions. All SDs for the first condition were the smallest among the conditions, indicating that the movements in the measured condition used the covariation in joint angles to make the hand movement stable. The results also illustrated that some SDs in the fourth condition were smaller than those in the third condition, suggesting that the lower extremity made effective use of the covariation. These results imply that it is necessary not only to reduce variability in each joint but also to regulate joint movements to stabilize hand orientation and movement.
登录
查看更多内容
影响因子：
2.2
作者：
Fleisig, Glenn;Chu, Yungchien;Andrews, James
通讯作者：
Andrews, James
影响因子：
2.5
作者：
Hore, J;Watts, S;Tweed, D
通讯作者：
Tweed, D
影响因子：
1.9
作者：
KAWATO, M;FURUKAWA, K;SUZUKI, R
通讯作者：
SUZUKI, R
影响因子：
2.1
作者：
Monaco, Vito;Tropea, Peppino;Micera, Silvestro
通讯作者：
Micera, Silvestro
影响因子：
2.1
作者：
Morrison, A.;McGrath, D.;Wallace, E. S.
通讯作者：
Wallace, E. S.