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Analysis of Premotor Time and Electro-Mechanical Delay of Ankle Joint Muscles: A Comparison between Sitting and Standing Postures

족관절 근육의 전운동 시간과 전기역학적 지연 분석: 앉은 자세와 선 자세의 비교

  • Kim, Ji-Won (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Jeong, Hong-Young (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Kwon, Yu-Ri (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Kim, Hyo-Hee (Department of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Eom, Gwang-Moon (Department of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Park, Byung-Kyu (Department of Physical Medicine and Rehabilitation, Korea University College of Medicine)
  • 김지원 (건국대학교 대학원 의학공학과) ;
  • 정홍영 (건국대학교 대학원 의학공학과) ;
  • 권유리 (건국대학교 대학원 의학공학과) ;
  • 김효희 (건국대학교 의료생명대학 의학공학부) ;
  • 엄광문 (건국대학교 의료생명대학 의학공학부) ;
  • 박병규 (고려대학교병원 재활의학과)
  • Received : 2012.05.22
  • Accepted : 2012.06.24
  • Published : 2012.06.30

Abstract

The purpose of this study was to compare premotor time(PMT) and electro-mechanical delay(EMD) between sitting and standing posture. Twenty four healthy young subjects(12 women and 12 men) participated in this study. Subjects were instructed to perform maximal, voluntary, isometric contraction of ankle muscle(tibialis anterior and gastrocnemius muscles) in reaction to auditory stimulus. PMT and EMD, calculated from stimulus, EMG and torque profile were compared between sitting and standing postures. As statistical analysis, paired t-test was performed to assess difference between sitting and standing posture. In both tibialis anterior and gastrocnemius muscles, EMD was found to be significantly longer for standing than sitting. However, PMT in standing posture was longer than that in sitting posture only in gastrocnemius muscles. These result indicate that increased reaction time, particularly, increased EMD of ankle muscles in standing posture may be caused by co-contraction of ankle muscles for postural control in standing posture.

Keywords

References

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