Fukuda Shiho, Oda Hitoshi, Kawasaki Taku, Sawaguchi Yasushi, Matsuoka Masakazu, Tsujinaka Ryo, Hiraoka Koichi
Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University, Habikino City, Osaka, Japan.
College of Health and Human Sciences, Osaka Prefecture University, Habikino City, Osaka, Japan.
Heliyon. 2022 Aug 30;8(9):e10470. doi: 10.1016/j.heliyon.2022.e10470. eCollection 2022 Sep.
This study determined the presence of the muscle responses to the support surface translation in the stance leg during gait and examined the effect of the direction and time point of the translation and that of the cognitive process on the responses. The rectus femoris (RF), biceps femoris (BF), soleus (SOL), and tibialis anterior (TA) muscles in the stance leg were tested. There was no significant effect of cognitive process on the electromyographic (EMG) activity induced by the translation of the support surface. In all muscles except the SOL, the EMG amplitude increased 0-300 ms after the support surface translation at the initial stance (IS) or middle stance (MS) of the tested leg. This means that the EMG activity in the leg muscles other than the SOL occurs after the support surface translation at the IS or MS no matter the direction of the translation. The EMG amplitude was not changed after the translation at the late stance, indicating that the translation does not influence the EMG amplitude at the double limb support phase with the tested leg behind the other. In the SOL, the EMG amplitude increased after the backward translation at the IS and after the forward translation at the MS, but decreased after the forward translation at the IS, indicating that the support surface translation-induced change in the EMG amplitude of the SOL is dependent on its direction. The change in the EMG amplitude of the TA and RF induced by the forward translation was greatest when the translation was given at the IS. In the SOL, the decrease in the EMG amplitude after the forward translation and the increase in the amplitude after the backward translation were greatest at the IS. Taken together, the change in the EMG amplitude induced by the support surface translation is greatest when the translation is given at the IS. The increase in the EMG amplitude in the TA and RF after the forward translation was greater than that after the backward translation at the IS, indicating that the EMG activity of the frontal leg muscles after the forward translation is greater when the translation is given at the IS.
本研究确定了步态期间站立腿对支撑面平移的肌肉反应的存在，并研究了平移的方向和时间点以及认知过程对这些反应的影响。对站立腿的股直肌（RF）、股二头肌（BF）、比目鱼肌（SOL）和胫骨前肌（TA）进行了测试。认知过程对支撑面平移诱发的肌电图（EMG）活动没有显著影响。在除SOL之外的所有肌肉中，测试腿初始站立（IS）或中间站立（MS）时，支撑面平移后0 - 300毫秒内EMG幅度增加。这意味着，无论平移方向如何，在IS或MS时，除SOL之外的腿部肌肉的EMG活动在支撑面平移之后出现。后期站立时平移后EMG幅度没有变化，表明平移不影响测试腿在另一腿后方的双支撑阶段的EMG幅度。在SOL中，IS时向后平移后EMG幅度增加，MS时向前平移后EMG幅度增加，但IS时向前平移后EMG幅度降低，表明支撑面平移诱发的SOL的EMG幅度变化取决于其方向。向前平移诱发的TA和RF的EMG幅度变化在IS时给予平移时最大。在SOL中，IS时向前平移后EMG幅度的降低和向后平移后幅度的增加最大。综上所述，支撑面平移诱发的EMG幅度变化在IS时给予平移时最大。IS时向前平移后TA和RF的EMG幅度增加大于向后平移后，表明IS时给予平移时，向前平移后前侧腿部肌肉的EMG活动更大。
