크레아틴 투여량이 태권도선수의 등속성 하지근력 및 발차기 횟수에 미치는 영향 = The effects on isokinetic strength of the lower extremity and repeated bouts of kicking in Taekwondo players by creatine supplementation dose

다국어 초록 (Multilingual Abstract)

Kim, S.S., Lee, C.W., Kim, N.S,, Shin, M.S., Kim, E,K., Jeong, K.H., Lee, J.K., Lee, D.H. The effects on isokinetic strength of the lower extremity and repeated bouts of kicking in Taewondo players by creatine supplementation dose. Exercise Science, 12(2): 341-352, 2003. The main purpose of the present study was to measure the isokinetic strength(lower extremity) and repeated bouts of kicking, plasma creatine·creatinine and body composition before and after a period creatine(by different doses) loading in Taekwondo players. Twenty two males were randomly assigned to four groups they were tested before and after 5 days of placebo(4×5g glucose·d^(-1), N=4) or Creatine monohydrate loading(consume 0.2g·kg^(-1), 0.3g·kg^(-1), 0.4g·kg^(-1) Cr each group, N=6 each group). 22 trained male Taekwondo players performed maximal front kicking continuously for 1 minute and took a rest for 30 seconds, after 30 seconds rest they should have to start kicking again. They repeated it 2 times more(total 3 sets) and the kicking times were measured each sets. Peak torque for strength·power and fatigue index for endurance of lower extremity muscle were also measured during each contraction with isokinetic equipment. The following results were obtained from this study. 1. The kicking test was significantly increased at 1, 2, 3 sets only in creatine 0.3g·kg^(-1) group(p＜0.05). 2. Not the other groups but the only creatine 0.3g·kg^(-1) group was increased for strength test but was not significantly increased. All groups were increased for the power test but was not significantly increased(the most increased group was 0.3g·kg^(-1) group). And also all groups were decreased for the fatigue index(endurance test), but they were not significantly decreased(only 0.3g·kg^(-1) group has shown decrease both of flexion and extension). 3. Only creatine 0.4g·kg^(-1) group was significantly increased of plasma creatine concentration both of before and after kicking test(p＜0.05). 4. Only creatine 0.4g·kg^(-1) group was significantly increased both of body mass and muscle mass(p＜0.05).