Evaluation and Analysis of Strength Values assessed Pre and Post pitch session in an MLS Team During the Season and After the Off Season.

The main objective was to determine the strength and power values in a professional Major League Soccer (MLS) team. Twenty-two professional football players from an MLS club, excluding goalkeepers, participated. Six assessments were conducted, including three pre- and three post-tests, assessing eccentric hamstring strength in the Nordic curl using the NordBord, maximal isometric strength in hip adduction-abduction with ForceFrame, and lower body power with CMJ in ForceDecks. The strength and power values established with the Pre and Post assessments show a CMJ height of 43.96 ± 3.92cm, in Nordic curl 382.46±67.79N-I and 370.66±65.84N-D, in hip adduction 414.79±73.86N-I and 424.02±71.88N (R), and in hip abduction 411.93±60.19N-I and 420.77±60.54N-R. The comparison between Pre and Post evaluations showed statistically lower values (p<0.05) in the Nordic Curl, hip adduction and abduction, while the CMJ showed no significant changes (p=0.056). On the contrary, after the transitional period only the CMJ showed lower values (p<0.05) compared to the Nordic Curl, and hip adduction and abduction (p˃0.05). The data studied show lower post-session strength values, except for power expressed in CMJ height. After the transitional period, hamstring and hip strength (ABD-ADD) did not show significant changes, but CMJ height did.

本研究旨在测定一家职业美国职业足球大联盟（MLS）球队的强度与功率值。排除守门员，共有来自该俱乐部二十二名职业足球运动员参与。共进行了六次评估，包括三次预测试和三次后测试，通过NordBord评估了北欧卷曲测试中的偏心股后肌群强度，ForceFrame评估了髋关节内收外展的最大等长强度，以及ForceDecks评估的下肢爆发力。预测试与后测试所建立的强度与功率值显示，CMJ高度为43.96 ± 3.92厘米，北欧卷曲测试中I组为382.46±67.79牛，D组为370.66±65.84牛，髋关节内收测试中I组为414.79±73.86牛，R组为424.02±71.88牛，髋关节外展测试中I组为411.93±60.19牛，R组为420.77±60.54牛。预测试与后测试的比较显示，在北欧卷曲、髋关节内收和外展测试中，数值均显著降低（p<0.05），而CMJ测试则无显著变化（p=0.056）。相反，在过渡期后，只有CMJ测试的数值相比北欧卷曲、髋关节内收和外展测试显著降低（p<0.05），而p值大于0.05。研究数据表明，除以CMJ高度表示的功率外，后训练期的强度值均有所下降。在过渡期后，股后肌群和髋关节强度（内收-外展）未显示出显著变化，但CMJ高度有所增加。