Mechanical factors affecting the foot eversion moment during the stance phase of running in non-rearfoot strikers
Mechanical factors affecting the foot eversion moment during the stance phase of running in non-rearfoot strikers
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影响非后足前锋跑步站立阶段足部外翻力矩的机械因素
DOI：
10.1080/14763141.2018.1548639
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发表时间：
2019
影响因子：
2.2
通讯作者：
Yasuo Ikegami
中科院分区：
文献类型：
--
作者：
Norio Tsujimoto;Hiroyuki Nunome;Takamasa Mizuno;Koichiro Inoue;Kazuhiro Matsui;Ryo Matsugi;Yasuo Ikegami
本研究旨在找出非后脚攻击者由于地面反作用力（GRF）而引起后脚外翻力矩的主要因素。这些数据与后脚击球者的数据进行了比较。总共有11名健康的男性，他们通常不是后脚攻击者，赤脚跑步。基于中外侧（Mxy）和垂直（Mz） GRF，将后足外翻/反转力矩（Mtot）分解为两个分量。计算踝关节中心高度和压力中心到踝关节中心的中外侧距离（a_cop）作为杠杆臂到Mxy和Mz分量。在足部接触后，非后脚攻击者的Mz显著增大，这强烈依赖于a_cop并产生了大部分Mtot，而Mtot在后脚攻击者中以Mxy为主。在连续加载阶段，非后脚走动者的Mxy显著增大，这与中外侧GRF密切相关，并在很大程度上促进了Mtot，而后脚走动者的Mtot在加载阶段几乎由Mz主导。研究发现，由于产生力矩的因素因足部接触方式的不同而不同，因此抑制力矩的策略可能因足部接触方式的不同而不同。
This study aimed to identify the primary factors that induce rearfoot external eversion moments due to ground reaction force (GRF) in non-rearfoot strikers. The data were compared with those of rearfoot strikers. Totally, 11 healthy males who were habitually non-rearfoot strikers ran barefoot. Rearfoot external eversion/inversion moments due to GRF (Mtot) were decomposed into two components based on mediolateral (Mxy) and vertical (Mz) GRFs. The height of the ankle joint centre and the mediolateral distance from the centre of pressure (COP) to the ankle joint centre (a_cop) were calculated as the lever arms to the Mxy and Mz components. Just after foot contact, non-rearfoot strikers demonstrated a significantly larger Mz, which was strongly dependent on a_cop and produced most of the Mtot, whereas Mxy dominated Mtot in rearfoot strikers. During the consecutive loading phase, non-rearfoot strikers demonstrated a significantly larger Mxy, which was strongly dependent on the mediolateral GRF and substantially contributed to Mtot, unlike the rearfoot strikers, whose Mtot was almost dominated by Mz during the loading phase. It was found that since the factor of generating the moment differs depending on the foot contact pattern, the strategies for suppressing the moment may be different for each foot contact pattern.