Department of Exercise Physiology, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
Department of Motor Performance, Faculty of Physical Education and Mountain Sports, Transilvania University of Braşov, Brasov, Romania.
Sci Rep. 2023 Feb 14;13(1):2625. doi: 10.1038/s41598-023-29793-5.
The current study aimed to analyze, using accelerometer-based activity, acute workload, chronic workload, acutechronic workloads ratio, training-monotony and training-strain throughout a competitive soccer-season and to compare these variables between players from different playing positions. Twenty-one professional soccer-players were monitored during the 48 weeks of the season. Players were grouped according to their position. Four lateral-defenders and four winger-players formed LDW group, four central-defenders and four forwards formed CDF group, and six midfielder-players formed MDF group. Accelerometer-based variables were collected during training and match contexts and were used to generate indicators of weekly acute and chronic workload, training monotony, training strain and metabolic power. A one-way ANOVA compared all dependent variables between groups, and effect sizes for pairwise comparisons were calculated. Results revealed variations in the weekly load throughout the season, which demands caution from coaches to avoid injuries. There were no differences in weekly-loads for all dependent variables (P > 0.05, small-to-moderate effects). We conclude that the weekly-load is not constant during a competitive season and players from different positions have similar weekly-loads. Therefore, previously reported in the literature, possible match-related positional differences might be compensated by differences in training-related loads, leading to a similar profile when considering the whole week.
本研究旨在通过基于加速度计的活动分析，急性工作负荷、慢性工作负荷、急/慢性工作负荷比、训练单调和训练紧张度在整个竞争赛季中的变化，并比较不同场上位置球员之间的这些变量。21 名职业足球运动员在整个赛季的 48 周内接受监测。根据位置将运动员分组。四名边后卫和四名边锋组成 LDW 组，四名中后卫和四名前锋组成 CDF 组，六名中场球员组成 MDF 组。在训练和比赛中收集基于加速度计的变量，并用于生成每周急性和慢性工作负荷、训练单调性、训练紧张度和代谢功率的指标。单因素方差分析比较了组间所有因变量，计算了两两比较的效应量。结果表明，整个赛季的每周负荷存在差异，这需要教练谨慎对待以避免受伤。所有因变量的每周负荷均无差异（P＞0.05，小到中等效应）。我们得出结论，在竞争赛季中每周负荷并非恒定，来自不同位置的球员具有相似的每周负荷。因此，正如文献中所报道的，可能与比赛相关的位置差异可能会被训练相关负荷的差异所补偿，从而在考虑整个星期时呈现出相似的特征。
