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Study on Asymmetrical EMG Activation Pattern of Selected Trunk and Thigh Muscles on Gait Velocity of Individuals With Post-Stroke Hemiparesis During Sit-to-Stand Movement

일어서기 동작시 편마비 환자의 보행 속도에 따른 체간과 하지 근 활성 형태의 비대칭성에 관한 연구

  • Park, Hyun-Ju (Dept. of Physical Therapy, The Graduate School, Daejeon University) ;
  • Oh, Duck-Won (Dept. of Physical Therapy, College of Health Science, Cheongju University) ;
  • Choi, Sung-Jin (Dept. of Rehabilitation Center, Boram Hospital) ;
  • Jang, Hyun-Jeong (Dept. of Physical Therapy, The Graduate School, Daejeon University) ;
  • Sim, Sun-Mi (Dept. of Rehabilitation Center, Youseong Wellness Hospital) ;
  • Cho, Hyuk-Shin (Dept. of Rehabilitation Center, Jooeun Raphas Hospital)
  • 박현주 (대전대학교 대학원 물리치료학과) ;
  • 오덕원 (청주대학교 보건의료대학 물리치료학과) ;
  • 최성진 (보람병원 물리치료실) ;
  • 장현정 (대전대학교 대학원 물리치료학과) ;
  • 심선미 (유성웰니스병원 물리치료실) ;
  • 조혁신 (주온라파스병원 물리치료실)
  • Received : 2011.12.06
  • Accepted : 2012.02.17
  • Published : 2012.05.21

Abstract

This study aimed to identify the asymmetry observed in the electromyography (EMG) activity patterns of selected trunk and thigh muscles between the affected and unaffected sides during the sit-to-stand movement in ambulatory patients with post-stroke hemiparesis. This study included 20 patients with post-stroke hemiparesis. The differences between stroke fast walkers (${\geq}8m/s$, 11 subjects) and stroke slow walkers (<8 m/s, 9 subjects) were compared. The activation magnitude and onset time of the multifidus, lumbar erector spinae, hamstrings, and quadriceps during the sit-to-stand movement were recorded through surface EMG. Moreover, the EMG activation magnitude and onset time ratios of each bilateral corresponding muscle from the trunk and leg were measured by dividing the relevant values of the unaffected side by those of the affected side. In all the subjects, the activation magnitudes of the multifidus, hamstring, and quadriceps on the affected side significantly decreased compared to those on the unaffected side (p<.05). The onset time of muscle activity in the affected side was markedly delayed for the multifidus and quadriceps during the task (p<.05). The activation magnitude ratios of the quadriceps were markedly decreased in the stroke slow walkers as compared to those in the stroke fast walkers. These findings indicate that the asymmetry in the multifidus, hamstring, and quadriceps muscle activation patterns in patients with post-stroke hemiparesis may be due to the excessive muscle activation in the unaffected side to compensate for the weakened muscle activity in the affected side. Our findings may provide researchers and clinicians with information that can be useful in rehabilitation therapy.

Keywords

References

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