Mechanomyogram amplitude vs. isometric ankle plantarflexion torque of human medial gastrocnemius muscle at different ankle joint angles.
Mechanomyogram amplitude vs. isometric ankle plantarflexion torque of human medial gastrocnemius muscle at different ankle joint angles.
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DOI：
10.1016/j.jelekin.2021.102609
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Son J
中科院分区：
文献类型：
--
作者：
Shi F;Rymer WZ;Son J
本研究的目的是探讨踝关节角度的变化对人腓肠肌内侧肌（MG）的机械肌图（MMG）振幅的影响。10名健康个体被要求以6种不同的收缩强度（10%至100%）和3种不同的踝关节角度（跖屈26°；跖屈10°；背屈3°）进行自愿等距收缩。使用3轴加速度计从MG肌表面记录MMG信号。研究了不同踝关节角度下均方根（RMS） MMG与等距跖屈力矩的关系，以评价肌肉力学特性的改变对RMS MMG的影响。我们发现，在不同的踝关节角度下，RMS MMG与跖屈力矩的关系发生了变化：RMS MMG随着跖屈力矩的增加而单调增加，但随着踝关节背屈而降低。RMS MMG与肌长、被动转矩、最大自主转矩呈负相关，且在不同踝关节角度下均发生显著变化。我们的研究结果证明了改变肌肉力学特性对肌肉振动幅度的潜在影响。未来的研究需要从肌肉力学和肌肉激活水平的角度来探索这种肌肉振动的主要来源，这是由于神经指令的变化。
The purpose of this study was to investigate the influence of changes in ankle joint angle on the mechanomyogram (MMG) amplitude of the human medial gastrocnemius (MG) muscle during voluntary isometric plantarflexion contractions. Ten healthy individuals were asked to perform voluntary isometric contractions at six different contraction intensities (from 10% to 100%) and at three different ankle joint angles (plantarflexion of 26°; plantarflexion of 10°; dorsiflexion of 3°). MMG signals were recorded from the surface over the MG muscle, using a 3-axis accelerometer. The relations between root mean square (RMS) MMG and isometric plantarflexion torque at different ankle joint angles were characterized to evaluate the effects of altered muscle mechanical properties on RMS MMG. We found that the relation between RMS MMG and plantarflexion torque is changed at different ankle joint angles: RMS MMG increases monotonically with increasing the plantarflexion torque but decreases as the ankle joint became dorsiflexed. Moreover, RMS MMG shows a negative correlation with muscle length, with passive torque, and with maximum voluntary torque, which were all changed significantly at different ankle joint angles. Our findings demonstrate the potential effects of changing muscle mechanical properties on muscle vibration amplitude. Future studies are required to explore the major sources of this muscle vibration from the perspective of muscle mechanics and muscle activation level, attributable to changes in the neural command.
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影响因子：
2.6
作者：
Alrowayeh HN;Sabbahi MA;Etnyre B
通讯作者：
Etnyre B
影响因子：
2.5
作者：
Herda, Trent J.;Housh, Terry J.;Cramer, Joel T.
通讯作者：
Cramer, Joel T.
DOI：
10.1007/s004210050418
发表时间：
1998-08-01
期刊：
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY
影响因子：
--
作者：
Ebersole, KT;Housh, TJ;Perry, SR
通讯作者：
Perry, SR
影响因子：
3.2
作者：
Cescon, C;Farina, D;Orizio, C
通讯作者：
Orizio, C
影响因子：
2.5
作者：
Héroux ME;Stubbs PW;Herbert RD
通讯作者：
Herbert RD