The Journal of Korean Physical Therapy
- Volume 18 Issue 3
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- Pages.37-45
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- 2006
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- 1229-0475(pISSN)
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- 2287-156X(eISSN)
Changes of Action Potential of Central Neuron by Maximal Voluntary Isometric Contraction
최대 수의적 등척성 수축력에 의한 중추신경원의 활동전위 변화
- Moon, Dal-Ju (Department of Physical Therapy, Graduate School, Dongshin University) ;
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Kim, Kye-Yoep
(Department of Physical Therapy, Dongshin University) ;
- Jeong, Jin-Gyu (Department of Physical Therapy, Graduate School, Dongshin University) ;
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Kim, Sue-Hyun
(Department of Physical Therapy, Graduate School, Dongshin University) ;
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Kim, Tae-Youl
(Department of Physical Therapy, Dongshin University)
- 문달주 (동신대학교 대학원 물리치료학과) ;
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김계엽
(동신대학교 물리치료학과) ;
- 정진규 (동신대학교 대학원 물리치료학과) ;
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김수현
(동신대학교 대학원 물리치료학과) ;
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김태열
(동신대학교 물리치료학과)
- Published : 2006.06.25
Abstract
Purpose: This study analyzed changes in spinal neuron and action potential of motor unit depending on voluntary contraction on spinal neuron adaptation. Methods: It selected 80 university students in their twenties and divided into experimental groups of 25% MVIC (I), 50% MVIC (II), 75% MVIC (III) and 100% MVIC (IV) depending on maximum voluntary isometric contraction (MVIC) and performed isometric exercise of plantar flexor muscle to each experimental group with given contraction for 20 times. It measured Mmax, H/Mmax, Hmax latency, V/Mmax, V wave latency before and after exercise, compared method and volume of contraction. Results: H/Mmax ratio showed significant difference in comparison among groups (p<0.01) and there was difference in I and IV groups. V/Mmax ratio showed significant difference in comparison among experimental groups (p<0.05) and there was difference in I and IV groups. When voluntary contraction level was maximum, changes were greatest. However, no significantly difference was to Mmax, H latency and V wave latency. Conclusion: These results suggest that amplitude changes of voluntary contraction level, spinal neuron and supra-spinal neuron had a dose connection that the more contraction level, the better central activation seem to decrease highly for a short time.