Performance Laboratory, Football Club FC Luzern, Luzern, Switzerland.
Institute of Sport Sciences of the University of Lausanne (ISSUL), University of Lausanne, Lausanne, Switzerland.
J Appl Biomech. 2023 Oct 24;40(1):21-28. doi: 10.1123/jab.2022-0296. Print 2024 Feb 1.
The purpose of this investigation was (1) to test the effect of movement restriction of the free leg during unilateral vertical jump on performance and power output comparing 2 different jump techniques: flexed (Classic technique) and straight (FC Luzern technique) free leg, and (2) to test the correlation between performance and power output obtained using these 2 techniques. Twenty elite soccer players performed squat (SJ) and countermovement (CMJ) jumps on each leg. The jump height and peak power output were compared between the 2 techniques for both legs. The jump height and peak power were significantly higher for the classic test for SJ and CMJ (P < .001) with no side effects or interactions. The angular range of motion of the free leg was higher for the Classic test than for the FC Lucerne test (P < .001), with no difference in the angular range of motion of the trunk. A moderate correlation was found between the 2 techniques on peak power (SJ: r = .626; CMJ: r = .649) and jump height (SJ: r = .742; CMJ: r = .891). Consequently, FC Lucerne technique, limiting the contribution of the free leg, is more appropriate to assess lower limb strength capacities during unilateral jump test.
本研究的目的是（1）测试单侧垂直跳跃时自由腿的运动限制对两种不同跳跃技术（屈腿（经典技术）和直腿（FC 卢塞恩技术））的性能和功率输出的影响，以及（2）测试这两种技术获得的性能和功率输出之间的相关性。二十名精英足球运动员分别在每条腿上完成深蹲（SJ）和反向跳跃（CMJ）。比较了两种技术的双腿跳跃高度和峰值功率输出。经典测试中 SJ 和 CMJ 的跳跃高度和峰值功率输出明显更高（P <.001），没有副作用或相互作用。自由腿的运动角度范围在经典测试中高于 FC 卢塞恩测试（P <.001），但躯干的运动角度范围没有差异。两种技术在峰值功率（SJ：r =.626；CMJ：r =.649）和跳跃高度（SJ：r =.742；CMJ：r =.891）上均具有中等相关性。因此，FC 卢塞恩技术限制了自由腿的贡献，更适合在单侧跳跃测试中评估下肢力量能力。
