Influence of Force Tremor on Mechanomyographic Signals Recorded with an Accelerometer and a Condenser Microphone during Measurement of Agonist and Antagonist Muscles in Voluntary Submaximal Isometric Contractions

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概要

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• The purpose of this study was to investigate the influence of force tremor (FT) on the mechanomyogram (MMG) recorded by a condenser microphone (MIC) and an accelerometer (ACC) for the measurement of agonist and antagonist muscles during submaximal isometric contractions. Following determination of the isometric maximum voluntary contraction (MVC), 10 male subjects were asked to perform elbow flexion and extension at 20%, 40%, 60%, and 80% MVC. Surface electromyogram (EMG) and MMG of the biceps brachii (BB) and triceps brachii (TB) were recorded simultaneously using a MIC (MMG-_<MIC>) and an ACC (MMG-_<ACC>). We analyzed the root mean square (RMS) for all signals and compared the sum of the power spectrum amplitude (SPA) at 3-6 Hz and 8-12 Hz between the MMG-_<MIC> and the MMG-_<ACC>. During elbow flexion and extension, the RMS of the EMG and the MMG-_<MIC> of the agonist were significantly (p<0.05) higher than those of the antagonist in each contraction level. The RMS of the MMG-_<ACC> of the antagonist showed no significant (p>0.05) difference from that of the agonist, or tended to be higher than the agonist. The SPA of the MMG-_<MIC> of the agonist at 3-6 Hz and 8-12 Hz tended to be higher than the antagonist in elbow flexion and extension at each contraction level. The SPA of the MMG-_<ACC> of the agonist and that of the antagonist showed no significant (p>0.05) difference, or the antagonist MMG-_<ACC> tended to be higher than that of the agonist. These results suggest the MMG detected by a MIC appears to be less affected by FT than is the ACC because of its inherent characteristic to reduce FT in simultaneously evaluated agonist and antagonist muscles by means of MMG during submaximal isometric contraction.

• 日本生理人類学会の論文

著者

• Shimomura Yoshihiro

  Humanomics Section, Graduate School of Engineering, Chiba University

• 勝浦 哲夫

  千葉大学

• 勝浦 哲夫

  Graduate School Of Engineering Chiba University

• SHIMOMURA Yoshihiro

  Faculty of Engineering, Chiba University

• KATSUURA Tetsuo

  Faculty of Engineering, Chiba University

• Kim Tae

  Graduate School Of Science And Technology Chiba University

• Kim Tae-Kwang

  Graduate School of Science and Technology, Chiba University

• Iwanaga Koichi

  Faculty of Engineering, Chiba University

• Katsuura Tetsuo

  Faculty Of Engineering Chiba University

• Shimomura Yoshihiro

  Graduate School Of Engineering Chiba University

• Shiomura Yoshihiro

  Faculty Of Engineering Chiba University

• Iwanaga Koichi

  Graduate School Of Engineering Chiba University

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