Seasonal changes of physical (motor) activities in professional Greek football players

Football is an activity demanding of each of the energy systems. There have been many studies that have described the match activity profiles of top-level soccer players during an annual season, but few have try to evaluate seasonal--variations month-by-month. Aim of Study. ?his study aimed to investigate the seasonal variations in physical (motor) activities of elite professional Greek football players in official-matches of a national League and in European matches by separated a season (2016-2017) in eight-month-period. Material and Methods. Twenty--seven players were recruited using Global-Positioning-System Technology (GPS). Total-distance (TD; km), high-speed-running (HSR; >19.8 km/h), very-high-intensity-speed-running (VHS; 19.8-25.2 km/h), maximal-sprinting (MS; >25.2 km/h), relative--distance/time (D/T), high-metabolic-load-distance (HMLD; meters), dynamic-stress-load (DSL), and number of accelerations--decelerations were measured. Multivariate analysis was performed. Results. Performance variations showed significant changes in all measurements (p < 0.05) noted from preparation phase (June--August) to end-season with the exception of DSL and HMLD. The greater TD was recorded in January and the lowest during preparation phase (10.4 vs. 9.0 km, p < 0.001) while higher average levels in HSR were found in February`s matches in relation to November`s (654.6 vs. 389.9 meters, p < 0.001) or in MS (147.4 vs. 68.9 meters, p = 0.004). Increase from the preparation phase over the seven-time-periods was found in VHS (+15.6%; p-trend < 0.001) or in TD (+11.8%; p-trend = 0.012). However decreases were observed in D/T (-8.8%; p-trend < 0.001) or in number of sprint-runs (-3.4%; p-trend = 0.028). Significant interactions (p < 0.001) were also revealed between playing position and the time periods, in accelerations and decelerations measurements (2 = 0.20). Conclusions. Significant changes to most of the motor activities variations were observed between the preparation--phase and mid-season (February-March). The analyses of physical loads on soccer players during official matches are highly useful for training individualization, as providing a tool for effective planning in matches` management, recording the loads on players and can therefore aid to avoid the risk for severe injuries.
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Aiheet: jalkapallo huippu-urheilu miespuolinen kilpailu liike juoksu analyysi valmistautumisaika kilpailukausi Kreikka pelipaikka GPS
Aihealueet: urheilukilpailut
DOI: 10.23829/TSS.2018.25.2-6
Julkaisussa: Trends in Sport Sciences
Julkaistu: 2018
Vuosikerta: 25
Numero: 2
Sivuja: 99-107
Julkaisutyypit: artikkeli
Kieli: englanti (kieli)
Taso: kehittynyt