Dobrijevic Slobodanka, Ilic Vladimir, Djuric Sasa, Jaric Slobodan
University of Belgrade, Faculty of Sport and Physical Education, The Research Centre, Blagoja Parovica 156, Belgrade, Serbia.
University of Delaware, Department of Kinesiology and Applied Physiology & Biomechanics and Movement Science Graduate Program, Rust Arena, Rm. 143, 549 South College Avenue, Newark 19716, DE, USA.
Gait Posture. 2017 Jul;56:60-64. doi: 10.1016/j.gaitpost.2017.04.033. Epub 2017 May 4.
Linear regression models applied on force (F) and velocity (V) data obtained from loaded multi-joint functional movement tasks have often been used to assess mechanical capacities of the tested muscles. The present study aimed to explore the properties of the F-V relationship of leg muscles exerting the maximum pulling F at a wide range of V on a standard motorized treadmill. Young and physically active male and female subjects (N=13+15) were tested on their maximum pulling F exerted horizontally while walking or running on a treadmill set to 8 different velocities (1.4-3.3m/s). Both the individual (median R=0.935) and averaged across the subjects F-V relationships (R=0.994) proved to be approximately linear and exceptionally strong, while their parameters depicting the leg muscle capacities for producing maximum F, V, and power (P; proportional to the product of F and V) were highly reliable (0.84<ICC<0.97). In addition, the same F-V relationship parameters obtained from only the highest and lowest treadmill V (i.e., the 'two-velocity method') revealed a strong relationship (0.89<R<0.99), and there were no meaningful differences regarding the magnitudes of the same parameters obtained from all 8 V's of the treadmill. We conclude that the F-V relationship of leg muscles tested through a wide range of treadmill V could be strong, linear, and reliable. Moreover, the relatively quick and fatigue-free two-velocity method could provide reliable and ecologically valid indices of F, V, and P producing capacities of leg muscles and, therefore, should be considered for future routine testing.
应用于从负重多关节功能性运动任务中获取的力（F）和速度（V）数据的线性回归模型，常被用于评估受试肌肉的力学能力。本研究旨在探究在标准电动跑步机上，腿部肌肉在广泛的速度范围内施加最大拉力F时，F-V关系的特性。对年轻且身体活跃的男性和女性受试者（N = 13 + 15）进行测试，让他们在设置为8种不同速度（1.4 - 3.3米/秒）的跑步机上行走或跑步时，水平施加最大拉力F。个体的F-V关系（中位数R = 0.935）以及受试者的平均F-V关系（R = 0.994）均证明近似呈线性且相关性极强，而描述腿部肌肉产生最大F、V和功率（P；与F和V的乘积成正比）能力的参数具有高度可靠性（0.84 < ICC < 0.97）。此外，仅从跑步机最高和最低速度（即“双速度法”）获得的相同F-V关系参数显示出很强的相关性（0.89 < R < 0.99），并且从跑步机所有8种速度获得的相同参数大小没有显著差异。我们得出结论，通过广泛的跑步机速度测试的腿部肌肉F-V关系可能很强、呈线性且可靠。此外，相对快速且无疲劳的双速度法可以提供腿部肌肉产生F、V和P能力的可靠且符合生态学效度的指标，因此，未来的常规测试应考虑采用该方法。
