マルチチャネル声面筋電図を用いた第1背側骨間筋の運動単位の形状と位置の推定方法

概要

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In this paper, we propose a method for estimating both the territory and location of single motor units (MUs) of the first dorsal interosseous muscle (FDI) by comparing the observed surface motor unit action potential (SMUAP) with model analysis. An eight-channel surface electromyogram (EMG) recorded the isometric contraction of 10% maximal voluntary contraction (MVC) by means of bipolar electrodes, each 1mm in diameter, placed on the skin surface. To characterize and visualize features reflecting the territory and location of MUs, we investigated an SMUAP profile in which the peak amplitude of the SMUAP of an eight-channel EMG was plotted against each channel. While some SMUAP profiles were bell-shaped, most of them were flat-topped. A novel square-shaped territory model, not the circular-shaped territory model, was proposed to explain these profiles. Both territories and locations of single motor units were estimated for two subjects. A new finding was that most of the square-shaped territories expanded 10-15mm horizontally along the skin surface. The present study showed the usefulness of the proposed method, particularly the introduction of the square-shaped territory model and SMUAP profile.
社団法人日本生体医工学会の論文
2005-12-10