Abstract
The objectives of this study were to quantify the matches and training workload in micro-cycles of an elite young soccer team considering field position and to explain meso-cycles based on change of weekly acute (wAWL), chronic load (wCWL), acute-to-chronic workload ratio, training monotony (wTM), and training strain (wTS) between early-, mid-, and end-season periods considering playing position and whole team. Twenty-six under-16 elite young soccer players participated in this study, including six wide defenders and wide midfielders (WM), five central defenders (CD) and central midfielders, and four strikers (ST). Daily monitoring was performed by players for 20 weeks with the rating of perceived exertion using the Borg CR-10 scale. In comparison with early-season, results showed that there was a significant increase, in all playing positions, in wAWL and wCWL (except ST) and in wTM (except CD and ST) compared with end-season. On the other hand, there were significant reductions in wTS in CD, WM, and ST at the end-season. According to the results, coaches should consider the field position in different situations. Differences between training workload and matches can be a good guide for coaches, who have a special understanding of what causes the most load in training programs. Excessive training workload can potentially cause injury to adolescent athletes and controlling wTM can prevent this.
Highlights
IntroductionTraining loads (TL) can be categorized internally and externally; the external training load is the specific training prescribed by the micro-electromechanical systems (e.g., global positioning system, location position system, inertial measurement unit), whereas the internal TL is the individual’s physical, mental, and psychological response (Charlot et al, 2016)
Training loads (TL) can be categorized internally and externally; the external training load is the specific training prescribed by the micro-electromechanical systems, whereas the internal TL is the individual’s physical, mental, and psychological response (Charlot et al, 2016)
For analyzing the differences between player positions, it was differentiated between six wide defenders (WD) and wide midfielders (WM), five central defenders (CD) and central midfielders (CM), and four strikers (ST; Malone et al, 2015; Nobari et al, 2020e)
Summary
Training loads (TL) can be categorized internally and externally; the external training load is the specific training prescribed by the micro-electromechanical systems (e.g., global positioning system, location position system, inertial measurement unit), whereas the internal TL is the individual’s physical, mental, and psychological response (Charlot et al, 2016). The second component of exercise load is usually described using heart rate, lactate concentration measurement, or rating of perceived exertion (RPE) (Foster, 1998; Eniseler, 2005; Dellal et al, 2008, 2010). Another way to quantity the level of fatigue, stress, delayed onset muscle soreness, and the quality of sleep is the Hooper Index (Hooper and Mackinnon, 1995; Nobari et al, 2020a, 2021b). Most professional teams are often reluctant to share supervisory data for competitive gain and, as a result, long-term, more detailed approaches are essentially needed to develop specific expertise on how to manage the burden on elite youth soccer (Kelly et al, 2020)
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