Electromyographic study of masticatory muscle fatigue and recovery under voluntary contraction. Part 1. Comparison of spectrum parameters for the power spectral shift.

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  • Hori Hisashi
    Niigata University, Graduate School of Dentistry, Major in Prosthodontics

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  • かみしめによるそしゃく筋疲労とその回復に関する筋電図学的研究　Ｉ　　各種周波数分析法の比較
  • Part 1. Comparison of spectrum parameters for the power spectral shift
  • 第1報各種周波数分析法の比較

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Abstract

The aim of this paper was to determine the best parameter for describing the muscle fatiguing process. Three parameters of mean power frequency (MPF), median frequency (MF), and peak frequency (PF) were tested with healthy subjects.<BR>During 10 sessions at more than one week intervals, the subjects performed the same endurance test with clenching at 80% of maximal electromyographic activity. Changes in the surface electromyogram of the bilateral masseter and temporal muscles were obtained in the above three parameters.<BR>From the comparison between the three parameters, PF showed the largest scattering, and MPF indicated a clear difference calculated from the values before and after fatigue. Thus it is concluded that MPF may be the best parameter.

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