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Journal of the Korean Academy of Rehabilitation Medicine 2001;25(5):812-817.
Motor Unit Numbers Estimation in Abductor Pollicis Brevis Muscle of Normal Adult.
Choi, Ok Chae , Yoon, Tae Sik , Lee, Joung Eun , Shin, Hye Sung
Department of Rehabilitation Medicine, Ewha Womans University College of Medicine.
정상인 단무지외전근에서의 운동 단위수의 추정
최옥채, 윤태식, 이정은, 신혜성
이화여자대학교 의과대학 재활의학교실
Abstract

Objective
To estimate the motor unit numbers in normal adult hand muscles using manual incremental technique and F-wave technique.


Method
We estimated the motor unit numbers in abductor pollicis brevis muscles of twenty normal adults. In manual incremental technique, we estimated the motor unit numbers using motor unit count program setted in electrodiagnostic equipment (Dantec, Keypoint). In F-wave technique, we estimated the motor unit numbers dividing maximal M-potential amplitude by mean amplitude of surface motor unit action potential.


Results
There was no significant difference of motor unit numbers between right and left abductor pollicis brevis in both manual incremental and F-wave technique. Motor unit numbers using F-wave technique were significantly greater than motor unit numbers using manual incremental technique.


Conclusion
The difference of motor unit numbers using manual incremental technique and F-wave technique was considered as a difference of functional electrical stimulation. F-wave technique was more physiologic and functional method of motor unit numbers estimation than manual incremental technique.

Key Words: Motor unit number, Manual incremental technique, F-wave technique


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