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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(3):729-736.
The Effect of Sprint and Heavy Resistance Training on Muscle Strength, Endurance and Muscle Fiber Type.
Seo, Jeong Hwan , Kim, Seong Yong , Kim, Yoo Chang
Department of Rehabilitation Medicine, Chonbuk National University Medical School.
운동 형태에 따른 근력 및 지구력 강화 효과와 근섬유 형태의 변화
서정환, 김성용, 김유창
전북대학교 의과대학 재활의학교실
Abstract

Objective
The purpose of this study is to compare muscle strength, endurance and the change of myosin heavy chain isoform after sprint training(ST) and heavy resistance training(HRT).


Method
Fourteen young athletes were enrolled and were randomly assigned into each training group. Before and after training for 8 weeks, the strength and the endurance were evaluated using isokinetic exercise system(Cybex 6000). The specimens of muscle biopsy were obtained from vastus lateralis muscle and were analysed for muscle fiber type using one dimensional electrophoresis.


Results
Peak torque, total work and mean power were increased significantly in both groups, but endurance ratio increased only in the sprint training group(P<0.05).

The proportions of myosin heavy chain(MHC) IIa fibers were increased in both groups and those of MHC IIb fibers were decreased in both groups(P<0.05). MHC I fibers were significantly increased in ST group, but decresed in HRT group(P>0.05).


Conclusion
This study shows that it is possible to increase muscle strength and to achieve fiber type transformation with the sprint training and the high resistance training.

Key Words: Sprint training, Heavy resistance training, Muscle strength, Endurance, Myosin heavy chain isoform


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