下肢推蹬訓練對下肢等速肌力及功能性表現的影響

Effect of a Leg Press Training on Isokinetic Peak Torque and Functional Performance of Lower Extremity

劉玫舫(Mei-Fang Liu) ； 陳淑雅(Shu-Ya Chen) ； 林泰薇(Tai-Wei Lin)

《中華民國物理治療學會雜誌》 22卷3期 (1997/07) Pp. 167-174

https://doi.org/10.29616/JPTAROC.199707.0002

摘要

Closed kinetic chain (CKC) exercises have been promoted as more functional and more safe than open kinetic chain (OKC) exercises, particularly for injuries involving the anterior cruciate ligament. Limited research demonstrated the training effect of CKC exercise on muscle strength and functional performance. The purpose of this study was to determine the effect of a leg press training on isokinetic peak torque and functional performance of lower extremity. Ten subjects participated in a 4-week training period, and 12 subjects served as controls. Pre- and posttests included: (1) isokinetic strength test of quadriceps/hamstring, (2) leg press test, (3) single-leg hop test for distance, and (4) single-leg hop for time. For the training group, a paired t-test comparing pretest and post- test values revealed significant improvements (p＜.05) in the isokinetic quadriceps peak torque at 180°/sec and 240°/sec, leg press peak torque at all three speeds, single-leg hop for distance, and single-leg hop for time and no significant change in other variables. For the control group, the significant difference (p＜.05) was found only in the isokinetic quadriceps peak torque at 180°/sec and 240°/sec. We conclude that this legpress exercise protocal improved lower extremity performance as measured by CKC activities, and the results supported the concept of training specificity. The OKC testing mode was not sensitive enough to detect actual improvement in lower extremity performance related to CKC training, and the possible cause may be the difference of muscle activation pattern between CKC and OKC exercise. Since the lower extremities usually function in a CKC mode, rehabilitation and assessment should be performed in a CKC. Therefore, any training effect would have a beneficial carryover to functional activities, and be detected by those appropriate tests.

關鍵字

下肢推蹬 ； 閉鎖動力鏈運動 ； 等速肌力

並列摘要

Closed kinetic chain (CKC) exercises have been promoted as more functional and more safe than open kinetic chain (OKC) exercises, particularly for injuries involving the anterior cruciate ligament. Limited research demonstrated the training effect of CKC exercise on muscle strength and functional performance. The purpose of this study was to determine the effect of a leg press training on isokinetic peak torque and functional performance of lower extremity. Ten subjects participated in a 4-week training period, and 12 subjects served as controls. Pre- and posttests included: (1) isokinetic strength test of quadriceps/hamstring, (2) leg press test, (3) single-leg hop test for distance, and (4) single-leg hop for time. For the training group, a paired t-test comparing pretest and post- test values revealed significant improvements (p＜.05) in the isokinetic quadriceps peak torque at 180°/sec and 240°/sec, leg press peak torque at all three speeds, single-leg hop for distance, and single-leg hop for time and no significant change in other variables. For the control group, the significant difference (p＜.05) was found only in the isokinetic quadriceps peak torque at 180°/sec and 240°/sec. We conclude that this legpress exercise protocal improved lower extremity performance as measured by CKC activities, and the results supported the concept of training specificity. The OKC testing mode was not sensitive enough to detect actual improvement in lower extremity performance related to CKC training, and the possible cause may be the difference of muscle activation pattern between CKC and OKC exercise. Since the lower extremities usually function in a CKC mode, rehabilitation and assessment should be performed in a CKC. Therefore, any training effect would have a beneficial carryover to functional activities, and be detected by those appropriate tests.

並列關鍵字

Leg press ； Closed kinetic chain ； Isokinetic muscle strength