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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根据年龄和位置进行力量发展：对570名足球运动员的10年研究

背景/目的这项研究的目的是比较巴西精英足球运动员在不同领域和年龄段的同心收缩和离心收缩过程中，股四头肌和and绳肌的等速运动峰值扭矩分布。我们的假设是，来自不同领域的足球运动员的等速运动峰值扭矩受到不同的老化相关影响。方法这是一项基于2009年至2019年职业精英足球运动员的回顾性研究。该研究包括570名成年男性，他们在巴西的第一或第二分区比赛了至少5年。比赛位置分为：守门员，后卫，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，年龄对扭矩有中等程度的影响（F（4545）= 8.197; p <0.001;η2= 0.057），演奏位置的影响较小（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。结论来自不同领域的足球运动员在其职业生涯中，其肌肉表现受到不同的衰老相关影响，应特别注意这些球员，以免身体表现下降。主要来自29岁以上的中场和守门员。结论来自不同领域的足球运动员在其职业生涯中，其肌肉表现受到不同的衰老相关影响，应特别注意这些球员，以免身体表现下降。主要来自29岁以上的中场和守门员。结论来自不同领域的足球运动员在其职业生涯中，其肌肉表现受到不同的衰老相关影响，应特别注意这些球员，以免身体表现下降。