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首页> 外文期刊>Journal of Biomechanics >SOLEUS FORCES AND SOLEUS FORCE POTENTIAL DURING UNRESTRAINED CAT LOCOMOTION
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SOLEUS FORCES AND SOLEUS FORCE POTENTIAL DURING UNRESTRAINED CAT LOCOMOTION

机译：不受约束的CAT运动中的固力和固力

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It has been suggested that the soleus muscle in the cat is maximally activated during slow walking (e.g. Walmsley et al.,.Am. J. Physiol. 41, 1203-1216, 1978); however, this opinion is not shared throughout the scientific community (e.g. Hodgson, J. Physiol. 337, 553-562, 1983). Whether or not the soleus is maximally activated for low-demand movements is critical for understanding the interaction and force-sharing of the soleus with the remaining ankle extensor muscles. The purpose of this study was to test experimentally whether the soleus muscle was maximally activated during low-demand, unrestrained movements. In order to achieve this purpose, the soleus was stimulated supramaximally at different instants of the step cycle during walking using a chronically implanted nerve cuff electrode. Forces of the soleus during normal step cycles and during step cycles following supramaximal nerve stimulation were measured using a standard E-shaped tendon force transducer. For slow (0.4 ms(-1)) and intermediate (0.8 ms(-1)) speeds of walking, soleus forces could be substantially increased through supramaximal nerve stimulation during the swing and mid-stance phases of the Step cycle; for fast walking (1.2 ms(-1)), such increases in force could be produced only during the swing phase. For all speeds of walking, the soleus forces could not be increased in the early (i.e. from paw contact to about peak force occurrence) or the late (i.e. the last 50-100 ms) parts of the stance phase. Specifically, peak forces and the rate of increase in force immediately following paw contact could not be increased substantially through supramaximal nerve stimulations at the appropriate instant in time for any of the conditions tested here. The results of this study indicate that force production of the soleus is maximal for fast walking (1.2 ms(-1)) throughout the stance phase, and is maximal for large portions of the stance phase for walking at slow (0.4 ms(-1)) and intermediate (0.8 ms(-1)) speeds. These findings have direct implications for explaining the possible mechanism oi force-sharing among the cat ankle extensor muscles, and the in vivo mechanical properties of the soleus. [References: 26]
机译：已经提出，猫的比目鱼肌在慢走过程中被最大程度地激活（例如，Walmsley等人，Am.J.Physiol.41，1203-1216，1978）。但是，这种观点在整个科学界并未得到共识（例如，Hodgson，J. Physiol。337，553-562，1983）。比目鱼是否被最大程度地激活以进行低要求的运动对于理解比目鱼与剩余的踝伸肌之间的相互作用和力共享至关重要。本研究的目的是通过实验测试在低需求，不受约束的运动过程中，比目鱼肌是否被最大程度地激活。为了达到这个目的，在步行过程中，使用慢性植入的神经袖带电极在步伐周期的不同瞬间将比目鱼肌最大化地刺激。使用标准的E形肌腱力传感器测量比目鱼肌在正常步幅周期和超最大神经刺激后的步幅周期中的力。对于慢速（0.4 ms（-1））和中速（0.8 ms（-1））的行走，在步幅周期的摆动和中位阶段，通过超最大的神经刺激，比目鱼肌力可以显着增加。对于快步行走（1.2 ms（-1）），仅在摆动阶段会产生这种力增加。对于所有的步行速度，比目鱼力都不能在站立阶段的早期（即从接触爪子到出现峰值力）或后期（即最后的50-100 ms）增加。具体而言，对于此处测试的任何一种情况，在适当的时间瞬间通过超最大的神经刺激，峰值力和紧随爪接触后的力量增加率基本上不会增加​​。这项研究的结果表明，比目鱼的力量产生在整个步态阶段中的快步行走（1.2 ms（-1））最大，而在步态阶段中大部分部分的慢速行走（0.4 ms（-1）最大））和中等（0.8 ms（-1））速度。这些发现对解释猫脚踝伸肌之间可能的力共享机制以及比目鱼的体内机械特性具有直接意义。 [参考：26]

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