Kellis E, Katis A
Department of Physical Education and Sports Sciences at Serres, Aristotle University of Thessaloniki, Serres, Greece.
J Sports Med Phys Fitness. 2007 Dec;47(4):385-94.
The purpose of this study was to investigate the relationship between isokinetic strength knee testing and soccer kick kinematics using electromyography (EMG).
Thirteen pubertal soccer players (age: 14.3+/-0.4 years) performed maximum instep soccer kicks, while knee angular position of the swinging leg was recorded using a twin-axis electrogoniometer. Bipolar surface EMG activity of the vastus medialis, vastus lateralis and biceps femoris (BF) muscles was recorded. The subjects also performed maximum knee extension and flexion efforts at concentric angular velocities of 1.04, 3.14 and 5.23 rad x s(-1) and eccentric angular velocities of 1.04 and 3.14 rad x s(-1).
The correlation coefficients between isokinetic moments and knee angular velocity values during the kick ranged from 0.609 to 0.898 for concentric moments and from 0.431 to 0.612 for eccentric moments. Agonist EMG values during isokinetic tests ranged from 63.17+/-19.9% to 128.7+/-34.9% maximum voluntary contraction (MVC). Antagonist EMG levels ranged from 9.76+/-6.12% to 36.91+/-22.81% MVC. The corresponding EMG values during the soccer kick ranged from 12.78+/-6.8% to 122.34+/-61.5% MVC and increased as the foot approached the ball.
Isokinetic tests at intermediate and fast angular velocities are adequate for monitoring strength training programs in soccer. However, muscle activation patterns differ between the two movements, especially those of the BF muscle.
本研究旨在使用肌电图（EMG）研究等速力量膝关节测试与足球踢球运动学之间的关系。
13名青春期足球运动员（年龄：14.3±0.4岁）进行最大脚背足球踢球动作，同时使用双轴电子角度计记录摆动腿的膝关节角度位置。记录股内侧肌、股外侧肌和股二头肌（BF）的双极表面肌电活动。受试者还在1.04、3.14和5.23弧度×秒⁻¹的向心角速度以及1.04和3.14弧度×秒⁻¹的离心角速度下进行最大膝关节伸展和屈曲动作。
踢球过程中等速力矩与膝关节角速度值之间的相关系数，向心力矩为0.609至0.898，离心力矩为0.431至0.612。等速测试期间激动剂肌电值范围为最大自主收缩（MVC）的63.17±19.9%至128.7±34.9%。拮抗剂肌电水平范围为MVC的9.76±6.12%至36.91±22.81%。足球踢球过程中相应的肌电值范围为MVC的12.78±6.8%至122.34±61.5%，并且随着脚接近球而增加。
中等和快速角速度下的等速测试足以监测足球中的力量训练计划。然而，两种运动之间的肌肉激活模式不同，尤其是BF肌肉的激活模式。
