Pimenta Ricardo, Antunes Hugo, Bruno Paula, Veloso A P
CIPER, Centro Interdisciplinar de Performance Humana, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisboa, Portugal.
Research Center of the Polytechnic Institute of Maia (N2i), Maia Polytechnic Institute (IPMAIA), Maia, Portugal.
Front Physiol. 2024 Jan 4;14:1315564. doi: 10.3389/fphys.2023.1315564. eCollection 2023.
This study compares the average speed, knee flexor peak torque and shear modulus of the hamstrings after a repeated sprint task, in football players of different competitive levels and playing positions. Fifty-four football field players without hamstring strain injury history participated, 15 being categorized as professional (2nd league) and 39 as semi-professional (17 in 3rd and 22 in 4th league). Muscle shear modulus was assessed using ultrasound-based shear wave elastography at rest and at 20% of maximal voluntary isometric effort before and immediately after the repeated sprint protocol. No significant differences were seen in average sprint speed between competitive levels ( = 0.07; η2 = 0.28) and positions ( = 0.052; η2 = 0.29). Moreover, the sprint fatigue index showed no significant differences between competitive levels ( = 0.14; η2 = 0.08) and playing positions ( = 0.89; η2 = 0.05). No significant differences were observed in hamstring shear modulus changes between competitive levels ( = 0.94; η2 = 0.03) and positions ( = 0.92; η2 = 0.03). Peak torque changes also showed non-significant association with competitive levels ( = 0.46; η2 = 0.03) and positions ( = 0.60; η2 = 0.02). The results of this study suggest that the average sprint speed performance parameter and mechanical parameters are not able to distinguish football players of different competitive levels and positions.
本研究比较了不同竞技水平和比赛位置的足球运动员在重复冲刺任务后腘绳肌的平均速度、屈膝肌峰值扭矩和剪切模量。54名无腘绳肌拉伤病史的足球运动员参与了研究，其中15名被归类为职业球员（第二级别联赛），39名被归类为半职业球员（17名在第三级别联赛，22名在第四级别联赛）。在重复冲刺方案之前、之中和之后，使用基于超声的剪切波弹性成像技术在静息状态和最大自主等长收缩力的20%时评估肌肉剪切模量。竞技水平（P = 0.07；η2 = 0.28）和位置（P = 0.052；η2 = 0.29）之间的平均冲刺速度没有显著差异。此外，冲刺疲劳指数在竞技水平（P = 0.14；η2 = 0.08）和比赛位置（P =
0.89；η2 = 0.05）之间没有显著差异。在竞技水平（P = 0.94；η2 = 0.03）和位置（P = 0.92；η2 = 0.03）之间，未观察到腘绳肌剪切模量变化的显著差异。峰值扭矩变化在竞技水平（P = 0.46；η2 = 0.03）和位置（P = 0.60；η2 = 0.02）之间也没有显著关联。本研究结果表明，平均冲刺速度性能参数和力学参数无法区分不同竞技水平和位置的足球运动员。
