Effect of knee joint position on soleus muscle function during isokinetic plantarflexion.

IF 2.2 4区医学 Q3 PHYSIOLOGY

Physiology international Pub Date : 2025-09-09 Print Date: 2025-10-07 DOI:10.1556/2060.2025.00640

Jingyi Ye, Bálint Kovács, Tibor Hortobágyi, Congyu Huang, Mengchen Ji, Yaodong Gu

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引用次数: 0

Abstract

Purpose: Contribution of the gastrocnemii muscles to ankle moment is influenced by the knee joint position because they span the knee and the ankle joint as well. However, limited information is available on the effect of knee joint position on soleus activation under dynamic plantarflexion, hence the aim of this study was to investigate if soleus have a compensatory strategy in fascicle behavior or EMG activity during knee flexed plantarflexion in order to reduce the magnitude of the decrement in ankle moment.

Equipment and methods: Isokinetic dynamometry with EMG and ultrasound measurements was used to estimate medial gastrocnemius and soleus behavior during knee flexed and extended plantarflexions using three angular velocities. Seventeen healthy males were participated in this study.

Results: Flexed knee plantarflexions resulted in lower peak ankle moments at all ankle angular velocities by 18% (P = 0.1062) at 30°∙s-1, 44% (P < 0.001) at 60°∙s-1 and by 18% (P = 0.0001) at 120°∙s-1. Soleus showed significantly higher EMG activity during knee flexed plantarflexion at 30°∙s-1 (P = 0.0094) and 60°∙s-1 (P = 0.0142). The magnitude of mean shortening of the medial gastrocnemius and soleus show statistically significant difference between knee flexed and knee extended plantarflexion at any contraction velocity.

Conclusions: Soleus may perform a compensatory EMG activity in knee flexed plantarflexions possibly to counteract the reduced contribution of gastrocnemius to ankle moment at low angular velocity contractions.

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膝关节位置对等速跖屈时比目鱼肌功能的影响。

目的：腓肠肌对踝关节力矩的贡献受膝关节位置的影响，因为腓肠肌横跨膝关节和踝关节。然而，关于膝关节位置对动态跖屈下比目鱼肌激活的影响的信息有限，因此本研究的目的是研究在膝关节屈曲跖屈时，比目鱼肌是否在肌束行为或肌电活动中具有代偿策略，以减少踝关节力矩的减少幅度。设备和方法：采用肌电图和超声测量的等速动力学方法，使用三种角速度来估计膝关节屈曲和跖屈伸展时腓肠肌内侧和比目鱼肌的行为。17名健康男性参与了这项研究。结果：在所有踝关节角速度下，屈膝跖屈导致踝关节峰值力矩在30°∙s-1时降低18% (P = 0.1062)，在60°∙s-1时降低44% (P < 0.001)，在120°∙s-1时降低18% （P = 0.0001）。在30°∙s-1 （P = 0.0094）和60°∙s-1 （P = 0.0142）屈曲膝关节时，比目鱼肌的肌电活动显著增加。腓肠肌内侧和比目鱼肌的平均缩短幅度显示，在任何收缩速度下，膝关节屈曲和膝关节伸直跖屈之间的差异具有统计学意义。结论：比目鱼肌可能在膝关节屈曲跖屈时进行代偿性肌电活动，可能抵消腓肠肌在低角速度收缩时对踝关节力矩的减少贡献。

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来源期刊

Physiology international Medicine-Physiology (medical)

CiteScore

3.40

自引率

0.00%

发文量

期刊介绍： The journal provides a forum for important new research papers written by eminent scientists on experimental medical sciences. Papers reporting on both original work and review articles in the fields of basic and clinical physiology, pathophysiology (from the subcellular organization level up to the oranizmic one), as well as related disciplines, including history of physiological sciences, are accepted.