Department of Physiology, Karachi Medical & Dental College, Karachi 75950, Pakistan.
J Electromyogr Kinesiol. 1995 Jun;5(2):109-15. doi: 10.1016/1050-6411(94)00013-c.
Integrated surface electromyographic (IEMG) activity of the vastus lateralis portion of the quadriceps muscle and knee torque were recorded during isokinetic concentric and eccentric actions, performed at maximum effort at a fixed velocity of 30 degrees s(-1) through 80-20 degrees knee flexion in 15 trained athletes. Mean IEMG and torque data were calculated for three ranges, viz. outer (25-44 degrees ), mid (45-54 degrees ) and inner (55-74 degrees ) and normalized as a percentage of mid-range concentric values. No significant difference was seen in IEMG activity either between left and right muscle or between concentric and eccentric action at any joint angle range. Similarly no significant difference was seen in torque between left and right muscle at any joint angle range. However, there was a significant difference in knee torque between the three angular ranges and between concentric and eccentric actions. It is concluded that no fixed relationship exists between vastus lateralis IEMG and quadriceps torque during maximum concentric and eccentric actions.
在 15 名训练有素的运动员中，以 30 度/秒的固定速度进行等速向心和离心运动，膝关节从 80 度屈曲到 20 度屈曲，记录股四头肌外侧头的整合表面肌电图（IEMG）活动和膝关节扭矩。将平均 IEMG 和扭矩数据计算为三个范围，即外（25-44 度）、中和（45-54 度）和内（55-74 度），并归一化为中值的百分比。在任何关节角度范围内，IEMG 活动在左侧和右侧肌肉之间或在向心和离心运动之间均无显着差异。同样，在任何关节角度范围内，左侧和右侧肌肉之间的扭矩均无显着差异。然而，在三个角度范围之间以及在向心和离心运动之间，膝关节扭矩存在显着差异。因此，在最大向心和离心运动期间，股外侧肌 IEMG 和股四头肌扭矩之间不存在固定关系。
