Grbic Vladimir, Djuric Sasa, Knezevic Olivera M, Mirkov Dragan M, Nedeljkovic Aleksandar, Jaric Slobodan
University of Belgrade, Faculty of Sport and Physical Education, The Research Centre, Belgrade, Serbia.
University of Belgrade, Institute for Medical Research, Department of Neurophysiology, Belgrade, Serbia.
Int J Sports Med. 2017 Sep;38(10):741-746. doi: 10.1055/s-0043-113043. Epub 2017 Aug 2.
Single outcomes of standard isokinetic dynamometry tests do not discern between various muscle mechanical capacities. In this study, we aimed to (1) evaluate the shape and strength of the force-velocity relationship of knee extensors, as observed in isokinetic tests conducted at a wide range of angular velocities, and (2) explore the concurrent validity of a simple 2-velocity method. Thirteen physically active females were tested for both the peak and averaged knee extensor concentric force exerted at the angular velocities of 30°-240°/s recorded in the 90°-170° range of knee extension. The results revealed strong (0.960<R<0.998) linear force-velocity relationships that depict the maximum muscle force (i.e. the force-intercept), velocity (velocity-intercept), and power (their product). Moreover, the line drawn through only the 60° and 180°/s data (the '2-velocity method') revealed a high level of agreement with the force-velocity relationship obtained (0.76<R<0.97; all power<0.001); while the force-intercept highly correlated (0.68<R<0.84; all power≤0.01) with the directly measured isometric force. The 2-velocity method could therefore be developed into a standard method for isokinetic testing of mechanical capacities of knee extensors and, if supported by further research, other muscles. This brief and fatigue-free testing procedure could discern between muscle force, velocity, and power-producing capacities.
标准等速测力测试的单一结果无法区分各种肌肉机械能力。在本研究中，我们旨在：（1）评估在广泛角速度下进行的等速测试中观察到的膝伸肌力量-速度关系的形状和强度；（2）探索一种简单的双速度方法的同时效度。对13名身体活跃的女性进行测试，记录她们在膝关节伸展90°-170°范围内以30°-240°/秒角速度施加的膝伸肌峰值和平均向心力量。结果显示出强线性（0.960<R<0.998）力量-速度关系，描绘了最大肌肉力量（即力量截距）、速度（速度截距）和功率（它们的乘积）。此外，仅通过60°和180°/秒数据绘制的线（“双速度方法”）与获得的力量-速度关系显示出高度一致性（0.76<R<0.97；所有p值<0.001）；而力量截距与直接测量的等长力量高度相关（0.68<R<0.84；所有p值≤0.01）。因此，双速度方法可发展成为一种用于膝伸肌机械能力等速测试的标准方法，如果得到进一步研究支持，也可用于其他肌肉。这种简短且无疲劳的测试程序可以区分肌肉力量、速度和产生功率的能力。
