Background/aim The purpose of this study was to compare the isokinetic peak torque profiles from the quadriceps and hamstrings muscles during concentric and eccentric contractions in elite Brazilian soccer players across different field positions and age categories. Our hypothesis was that soccer players from different field positions are subjected to different ageing-related effects on their isokinetic peak torque. Methods This is a retrospective study based on professional elite-level soccer players between the years 2009 and 2019. It included 570 adult males who played for at least 5 years on first or second Brazilian divisions. Playing positions were divided as: goalkeepers, defenders, sidebacks, midfielders and forwards. Age categories were also divided as: G1 (17–20 years old), G2 (21–24 years old), G3 (25–28 years old), G4 (29–32 years old) and G5 (33 years old or more). Results The results indicate a moderate effect of age (F(4545)=8.197; p<0.001; η2=0.057) and a small effect of playing position (F(4545)=2.993; p<0.05; η2=0.021) on torque of concentric extensors; mainly from midfielders and goalkeepers with 29 years or more. Conclusions Soccer players from different field positions are subjected to different ageing related effects on their muscular performance during their career special attention should be given to these players to avoid reduction in physical performance.

中文翻译：

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根据年龄和位置发展力量：对 570 名足球运动员进行为期 10 年的研究

背景/目的 本研究的目的是比较不同场地和年龄组的精英巴西足球运动员在向心和离心收缩期间股四头肌和腘绳肌的等速峰值扭矩曲线。我们的假设是，来自不同场地位置的足球运动员对其等速峰值扭矩会受到不同的老化相关影响。方法 这是一项基于 2009 年至 2019 年间职业精英级足球运动员的回顾性研究。它包括 570 名在巴西甲级或乙级联赛踢球至少 5 年的成年男性。比赛位置分为：守门员、后卫、边后卫、中场和前锋。年龄类别也分为：G1（17-20岁）、G2（21-24岁）、G3（25-28岁）、G4（29-32岁）和G5（33岁或以上）。结果 结果表明，年龄（F（4545）=8.197；p<0.001；η2=0.057）对扭矩的影响适中，比赛位置的影响很小（F（4545）=2.993；p<0.05；η2=0.021）同心伸肌；主要来自29岁以上的中场和守门员。结论 不同场位的足球运动员在其职业生涯中，其肌肉表现受到不同的年龄相关影响，应特别注意这些运动员，避免身体表现下降。主要来自29岁以上的中场和守门员。结论 不同场位的足球运动员在其职业生涯中，其肌肉表现受到不同的年龄相关影响，应特别注意这些运动员，避免身体表现下降。主要来自29岁以上的中场和守门员。结论 不同场位的足球运动员在其职业生涯中，其肌肉表现受到不同的年龄相关影响，应特别注意这些运动员，避免身体表现下降。