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Placement of a plate under the forefoot in stance: decreasing the excitability of the soleus motoneuron pool.

Research paper by Koichi K Hiraoka

Indexed on: 21 Oct '03Published on: 21 Oct '03Published in: American journal of physical medicine & rehabilitation / Association of Academic Physiatrists



Abstract

To investigate the effect of the placement of a plate under the sole of the forefoot on the excitability of the soleus motoneuron pool in stance.While eight neurologically intact subjects remained in stance, a square plate (30 x 30 mm), either 3 mm or 6 mm in thickness, was placed under the left medial plantar eminence, under the left lateral plantar eminence, or under the left forefoot sole between the eminences, or a rectangular plate (120 x 30 mm), either 3 mm or 6 mm in thickness, was placed under the left metatarsal heads. To investigate the excitability of the soleus motoneuron pool, the Hmax/Mmax ratio was estimated.Analysis of variance revealed that the region under which the plate was placed had a significant effect and that the thickness of the plate had a nonsignificant effect on the Hmax/Mmax ratio, without significant interaction between the two factors. Post hoc analysis revealed a significant decrease in the Hmax/Mmax ratio when the square plate was placed under the lateral plantar eminence.A square plate placed under the lateral plantar eminence inhibited the excitability of the ipsilateral soleus motoneuron pool in stance. This intervention may be useful for reducing spasticity.