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Journal of the Korean Academy of Rehabilitation Medicine 1995;19(2):4.
Relationship between the Myoelectric Signal and the Force of Isometric Contractio
Ju Kang Lee, M.D., Jae Ho Moon, M.D., Ueoun Woo Rah, M.D.*, , Seoung Woong Kang, M.D.
Department of Rehabilitation Medicine, Yonsei University College of Medicine

Department of Rehabilitation Medicine, Aju University College of Medicine*

운동전위와 등척성 근수축력의 상관관계
이주강, 문재호, 나은우, 강성웅
연세대학교 의과대학 재활의학교실 및 아주대학교 의과대학 재활의학교실*

The relationship between myoelectric signal and force was investigated. 16 healthy male volunteers performed isometric contraction of elbow flexor and extensor at 90 angle from the horizontal plane. The contracting force was measured at 20% maximal voluntary contraction(MVC), 40%MVC, 60%MVC, 80%MVC and 100%MVC. The myoelectric signal was detected from elbow flexor and extensor using monopolar surface electrodes at each force level. The recorded myoelectric amplitude, turns/mean amplitude, root mean square voltage and power. The relationship between contraction force and myoelectric signal parameters was analysed.

1) The frequency sensitive parameters, zero crossings and turns were increased abruptly with force form 0 to 20%MVC and increased gradually with force from 20 to 60%MVC, but decreased slightly with force from 60 to 100%MVC.

2) The amplitude sensitive parameters, mean amplitude and root mean square voltage were increased linearly with force from 0 to 100%MVC, and power value was increased curvilinearly with force from 0 to 100%MVC.

On the basis of this study, mean amplitude and root mean square voltage were superior to other parameters when used as descripters of contracting force in elbow flexor and extensor, and can be used as an indirect parameter of measuring force in the future.

Key Words: Myoelectric signal, Force


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