Daikuya S, Ono A and Yabe K
To clarify that the fluctuation of the excitability of spinal neural function after ankle sprain, we studied the alteration of H reflex from the soleus muscle in a patient with ankle sprain. A Subject was male college basketball player, whose age was twenty-one years old, and diagnosed left ankle inversed sprain (grade II). H reflex and maximal M wave from the bilateral soleus muscle were evoked at rest and amplitude ratio of H/Mmax was calculated. And, amplitude ratio of H/Mmax was compared between after and before injury. As a result of this study, amplitude ratio of H/Mmax was increased at three days after ankle sprain on both injured side and non-injured side compared with both before and one month after injury and, Long Latency Reflex (LLR) was appeared behind the H reflex consecutively on the only injured side. From results of this study, it was cleared that the excitability of spinal and supra-spinal neural function related to soleus muscle at three days after was increased due to pain, joint effusion and/or joint instability.
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