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Journal of the Korean Academy of Rehabilitation Medicine 1994;18(3):27.
The Relationship between Isokinetic Strength of the Ankle and Jump Height in Normal Adults
Do Youn Kwon, M.D., Sang Kyu Kim, M.D. , In Young Seong, M.D.
Department of Rehabilitation Medicine, University of Ulsan College of Medicine
정상 성인의 족관절부 근육의 등속성 근력 및 점프력의 평가
권도윤, 김상규, 성인영
울산대학교 의과대학 재활의학교실

The purpose of this study were to know the correlation between kinetic and kinematic parameters in jump activity and to know the difference between the function of biarticular muscles and uniarticular muscles in jumping. For these purposes, isokinetic testings of ankle muscles of 20 non-athlete males were compared with the kinematic parameter, jump height and anthropometric measurements. The Cybex isokinetic dynamometer for kinetic parameters and Sargent Jump Meter for kinematic jump parameter were used. And the results were as follows:

1) The mean age of 20 subjects was 24.8 years, mean height was 172.5 cm, mean weight was 68.0 kg and the mean jump height was 51.5 cm.

2) There was no meaningful correlation between jump height and peak torque among muscles around ankle joint. But there were meaningful correlation between jump height and peak torque % body weight and average power even though the correlation coefficient was low.

3) The plantar flexor activity during knee flexion was more correlated with jump height than that during knee extension but there was no statistical meaning.

4) The weight was highly reversely correlated with jump height and was linearlly correlated with peak torque and other isokinetic parameters.

And the authors concluded as follows: firstly, isokinetic parameters should be cautiously used in sports medicine for evaluations, secondly, the soleus muscle activity was important for jumping activity as much important as biarticular gastrocnemius muscle and finally, weight factor during high competitive sports activity and sports medicine is very important and should be considered.

Key Words: Kinematic parameter(Jump height), Kinematic parameters, Peak torque, Weight factor


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