Effect of Electric Stimulation on Silent Period Measurement.

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  • DAIKUYA SHINICHI
    Kyoto GAKUSAI Institute of Community Medicine attached Hospital
  • SUZUKI TOSHIAKI
    Division of Physical Therapy, College of Medical Technology, Kyoto University
  • TAKEDA ISAO
    Division of Physical Therapy, College of Medical Technology, Kyoto University
  • FUJIWARA TETSUJI
    Division of Physical Therapy, College of Medical Technology, Kyoto University

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  • 電気刺激条件がサイレントピリオドに与える影響について

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We studied the effect of electric stimulation on silent period measurement, in non-athlete, healthy subjects with a mean age of 25.1 years (9 healthy subjects, 18 extremities, 8 males and 1 female). The silent period was recorded from the opponens pollicis muscle under the following 3×3 electric stimulation conditions: 0.2Hz, 0.5Hz and 1.0Hz; 80%, 100% and 120% of intensity in maximal amplitude of his or her M-wave. When the electric intensity was changed, the silent period did not vary significantly. However, the silent period increased with intensity of the stimulation. With a faster frequency of stimulation, the silent period became significantly shorter.<BR> The present findings suggest that in sile nt period measurement, supra-maximal electric stimulation is most suitable. However, 1.0Hz stimulation is not suitable because nervous system is relatively excited by electric stimulation.

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