Characteristics of Surface EMG Recorded from the Biceps Brachii during Rapid Isometric Elbow Flexion

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  • 急激な等尺性肘屈曲力発揮時の上腕二頭筋表面筋電図の特徴
  • キュウゲキ ナ トウ シャクセイ ヒジ クッキョクリョク ハッキジ ノ ジョウ ワン ニトウキン ヒョウメンキンデンズ ノ トクチョウ

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The purpose of this study was to investigate the characteristics of surface EMG (sEMG) during rapid contraction (Rapid) from the view points of normalization with maximum voluntary contraction (MVC) and activity of motor unit (MU). In order to solve above problem, the elbow flexion force and sEMG variables such as the average rectified value (ARV), median frequency (MDF) and muscle fiber conduction velocity (MFCV) were calculated with sEMG recorded from the biceps brachii. As a result, subjects participated in this study were classified into two groups which had different relationship between flexion force and ARV in Rapid. This result showed that traditional method with MVC was usable for normalizing the sEMG recorded from subjects belonging to group-I, but the normalization for the sEMG from group-II required the additional corrective method. Consequently, it is important to clarify the group to which each subject participated belongs before normalizing the sEMG in Rapid with MVC. And, no differences of MFCV between group-I and -II, or Rapid and MVC were found. These results show that MUs in Rapid have the characteristics which are different from the activities in MVC. For instance, fewer MUs are recruited during Rapid than during MVC. And then a few F (Fast)-type MUs, which contract more quickly and strongly and have larger size than the other S (Slow)-type MU, are recruited selectively in Rapid and their activities probably synchronize.

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