Szukana fraza: [Abstrakt = "Introduction. 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. Τhis study aimed to investigate the seasonal variations in physical \(motor\) activities of elite professional Greek football players in official\-matches of 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 \(147.4vs. 68.9 meters, p = 0.004\). 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 \(η2 ≥ 0.20\). 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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