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首页> 外文期刊>Journal of Neuroscience Methods >Joint-afferent-mediated muscle activations yield a near-maximum torque response of the quadriceps.
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Joint-afferent-mediated muscle activations yield a near-maximum torque response of the quadriceps.

机译：关节激进介导的肌肉激活产生股四头肌的接近最大扭矩响应。

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Previous work from our laboratory has shown that reflex activity is systematically evoked in a number of major knee muscles by large (>5 degrees ) (non-physiological) abduction angular perturbations of the human knee. This reflex action was shown to originate from periarticular tissue afferents. Furthermore, it was demonstrated that specific muscle activation patterns exist in knee muscles with preferential activation in medial muscles in response to the lateral perturbations. This study examines the hypothesis that in response to the mechanical stimulus, the sensory information mediated by these afferents results in activation patterns that provide the largest resisting moment by the knee muscles. It is further hypothesized that this near maximum resistance cannot be achieved by the selective activation of medial muscles alone. To examine this, the previously reported mechanically induced reflex EMG activation patterns, a stochastic 3D musculoskeletal patello-femoral joint model, and new data from selective electrical stimulation experiments were used. Using the model, the knee adduction-abduction moment in response to an applied abduction load at the knee joint for every possible random set of quadriceps activity was computed. These adduction moments were then compared to the adduction moment computed by the model when the mechanically induced muscle activation patterns were used. The data presented here illustrated that selective activation of a medial muscle alone would result in an abduction moment, regardless of the knee flexion angle. Furthermore, the findings of this study revealed that the recorded combinations of muscle activity provide a near maximum capability of the quadriceps muscles to resist externally applied abducting stimuli. It was concluded that stabilization in the abduction direction could only be achieved by a control strategy that involves activation of both medial and lateral muscles at the knee. It was also concluded that this control strategy was near optimal when mediated byjoint afferents.
机译：我们实验室的先前工作表明，许多主要的膝盖肌肉都会因人的膝盖大（> 5度）（非生理性）外展角扰动而引起系统的反射活动。已表明这种反射作用源自关节周围组织传入。此外，已经证明，响应于外侧扰动，膝部肌肉中存在特定的肌肉激活模式，内侧肌肉中存在优先的激活。这项研究检验了以下假设：响应机械刺激，这些传入物质介导的感觉信息会导致激活模式，该模式提供膝盖肌肉最大的抵抗力。进一步假设，仅通过选择性激活内侧肌肉不能达到这种接近最大的抵抗力。为了检验这一点，使用了先前报道的机械诱导的反射肌电激活模式，随机的3D肌肉骨骼pat骨-股骨关节模型以及来自选择性电刺激实验的新数据。使用该模型，针对每组可能的四头肌活动随机集合，计算了响应于膝关节上施加的外展负荷的膝盖内收外展力矩。然后将这些内收力矩与使用机械诱导的肌肉激活模式时由模型计算的内收力矩进行比较。此处提供的数据表明，无论膝关节屈曲角度如何，仅内侧肌肉的选择性激活都会导致外展力矩。此外，这项研究的发现表明，所记录的肌肉活动组合提供了股四头肌抵御外部施加的外展刺激的最大能力。结论是绑架方向的稳定只能通过涉及激活膝部内侧和外侧肌肉的控制策略来实现。还得出结论，当由关节传入者介导时，这种控制策略接近最佳。

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