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Journal of the Korean Academy of Rehabilitation Medicine 2006;30(1):13-18.
Effect of Bilateral Contraction of Proximal Arm Muscle on Electromyographic Activity in Hemiplegic Patients.
Park, Byung Kyu , Park, Jae Heung , Lee, Hyun Choong
Department of Rehabilitation Medicine, Pusan National University College of Medicine. caremotor@yahoo.co.kr
편마비 환자의 상지 근위부 양측성 수축에 의한 근전도 발현양상의 변화
박병규, 박재흥, 이현충
부산대학교 의과대학 재활의학교실
Reaction time is known to be longer for bilateral activities than for unilateral ones. However, bilateral isometric training is a common technique for motor recovery in relatively early stage of recovery following stroke. Moreover, few studies elucidated the response time of proximal arm muscle. This study was designed to investigate the effects of bilateral shoulder abduction on electromyographic (EMG) timing in hemiplegic subjects.
EMG signal of 18 subjects with hemiplegia was recorded during isometric contraction of shoulder abductor along the audible beep. Each subject performed three sets of contraction: unilateral contraction of each side and simultaneous bilateral contraction. EMG parameters included initiation delay, termination delay, and root mean square (RMS).
When subjects performed bilateral contraction simultaneously, initiation and termination delays and RMS of paretic arm significantly increased in the affected arm than nonaffected side. Compared with unilateral contraction, initiation and termination delays did not differ significantly although RMS was significantly reduced. In addition, side- to-side difference of termination delay significantly decreased.
These results demonstrated that bilateral isometric training of proximal arm muscle could be performed for motor recovery after stroke with no compromise of movement timing. Furthermore, movement control would be expected to be enhanced. (J Korean Acad Rehab Med 2006; 30: 13-18)
Key Words: Bilateral, Timing, Proximal, Electromyography, Hemiplegia


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