Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.
High Performance Center of Sierra Nevada, Spanish Sport Council, Granada, Spain.
Int J Sports Med. 2018 Dec;39(13):984-994. doi: 10.1055/a-0644-3742. Epub 2018 Oct 5.
We aimed to explore relationships between the force-velocity (FV) profile and the isometric muscle torque performance during a knee extension task. The FV profile (force-intercept [F], velocity-intercept [V], maximum power [P], and FV slope) during the countermovement jump (CMJ) exercise and isometric maximum voluntary torque (MVIC) and explosive voluntary torque production were assessed in 43 participants. Electromyography (EMG) was recorded during the isometric assessments and resting muscle architecture measurements were also performed (quadriceps thickness, vastus lateralis pennation angle and fascicle length). Pearson's correlation coefficients were computed to assess bivariate relationships between the FV profile, isometric torque, EMG activation and muscle architecture. F predictions from neuromuscular measurements were assessed through multiple linear regression. Associations of F and P with isometric torque increased from explosive to MVIC torque (r≥0.47; P<0.05). Significant associations were found between muscle architecture and F and P (r≥0.69; P<0.05), while V and FV slope were unrelated (r≤0.27; P>0.05). Quadriceps thickness and VL pennation angle explained ~62% of F variance. In conclusion, the knee extensors maximal isometric strength and their morphological architecture are strongly related to F estimated from a CMJ FV profile test.
我们旨在探讨膝关节伸展任务中力量-速度（FV）曲线与等长肌肉扭矩性能之间的关系。在 43 名参与者中，评估了反跳式（CMJ）运动中的 FV 曲线（力截距 [F]、速度截距 [V]、最大功率 [P]和 FV 斜率）以及等长最大自主扭矩（MVIC）和爆发性自主扭矩产生。在等长评估期间记录肌电图（EMG），并进行休息时的肌肉结构测量（股四头肌厚度、股外侧肌羽状角和肌束长度）。通过皮尔逊相关系数评估 FV 曲线、等长扭矩、EMG 激活和肌肉结构之间的双变量关系。通过多元线性回归评估神经肌肉测量中 F 和 P 对 F 的预测。F 和 P 与等长扭矩的相关性从爆发性扭矩到 MVIC 扭矩逐渐增加（r≥0.47；P<0.05）。肌肉结构与 F 和 P 之间存在显著相关性（r≥0.69；P<0.05），而 V 和 FV 斜率则没有相关性（r≤0.27；P>0.05）。股四头肌厚度和 VL 羽状角可以解释 F 变异的约 62%。总之，膝关节伸肌的最大等长强度及其形态结构与从 CMJ FV 曲线测试中估计的 F 密切相关。
