Muscle contraction evaluation by the simultaneous measurement of MMG and EMG

Hisao Oka, Yuto Konishi

Research output: Contribution to journalArticlepeer-review


In order to evaluate the contraction performance of skeletal muscle, it is necessary to measure MMG and EMG signals simultaneously, because they are an input and an output signal for muscle contraction, respectively. In this study, a new evaluation method of isometric contraction of the quadriceps muscle were proposed using the MMG / EMG hybrid transducer which could measure MMG and EMG signal simultaneously. When this transducer was applied on the skin surface of the right leg of two subjects, they performed two types of knee extension isometric contraction with open kinetic chain. One was knee extension movement more than muscle force of 600 [N] and the other was maximum voluntary contraction. The proposed muscle performance index (MMG/EMG) hardly changed in the former case, but gradually increased in the latter case because of muscle fatigue. Thus the new index was able to evaluate the muscle contraction and muscle fatigue numerically.

Original languageEnglish
Pages (from-to)O-235-O-236
JournalTransactions of Japanese Society for Medical and Biological Engineering
Publication statusPublished - Aug 17 2014
Externally publishedYes


  • Isometric contraction
  • Mechanomyogram
  • Muscle contraction
  • Muscle fatigue

ASJC Scopus subject areas

  • Biomedical Engineering


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