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The H-reflex as an Important Indicator in Kinesiology

机译：H反射作为人体运动学的重要指标

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Hoffmann’s reflex (the H-reflex) is an electrically-induced reflex that is analogous to the mechanically-induced stretch reflex controlled by the spinal cord. The most common measurements performed concerns the electrical response of the soleus muscle to electrical stimulation in the tibial nerve. The response is induced by a discharge occurring in a motoneuron. The latency time of the H-reflex for the soleus muscle amounts to 30–40 ms. An increase in the strength of the stimulus induces a direct response from the muscle, i.e. the M-wave. The latency time of the M-wave amounts to 4–5 ms. A sport training may affect the parameters of the H-reflex. The Hmax/Mmax ratio is the highest among persons engaged in endurance sports and the lowest among those practising speed and strength sports. A decreased amplitude of the H-reflex characterises the level of the central fatigue, while a decrease in the M-wave amplitude is attributed to the peripheral fatigue. Usually, a decrease in Hmax/Mmax ratio is observed post-exercise. Different times of recovery were reported in the literature. No clear quantitative laws have yet been established that govern the course of the reflex as a result of fatigue. The H-reflex still remains within the scope of the interests of kinesiology as a valuable source of information about the reflex functions in the human motor system.
机译：霍夫曼反射（H反射）是一种电感应反射，类似于脊髓控制的机械感应拉伸反射。进行的最常见测量涉及比目鱼肌对胫神经电刺激的电响应。响应是由运动神经元中发生的放电引起的。比目鱼肌H反射的潜伏时间为30–40 ms。刺激强度的增加引起肌肉的直接响应，即M波。 M波的等待时间为4–5 ms。运动训练可能会影响H反射的参数。 Hmax / Mmax比值在从事耐力运动的人中最高，而在从事速度和力量运动的人中最低。 H反射的幅度降低表示中央疲劳的水平，而M波幅度的降低归因于周围疲劳。通常，运动后观察到Hmax / Mmax比值降低。文献报道了不同的​​恢复时间。尚未建立明确的定量法则来控制疲劳导致的反射过程。 H反射仍作为人体运动系统中有关反射功能的宝贵信息源，仍在运动机能学的研究范围内。

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