Positional Based Work-Rate Analysis in Elite Soccer
University of Wales
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The purpose of this study was to assess the intermittent nature of elite soccer and see how the work rate is affected by different positional roles. Time-motion analysis of 20 elite soccer players, 18 playing the Barclays Premier League, 1 in the Scottish Premier League and 1 in French Ligue 1, was conducted over 90 minutes, following the same player for the entire match duration. Central defenders, wide defenders, central midfielders, wide midfielders and forwards were the positional categories used. The Computerized All Purpose Time-motion Analysis INtegrated (CAPTAIN) system was used to enter the voice recorded clips onto an electronic source. Reliability of the system was found to be Very Good (Altman, 1991) using a Kappa test on an inter-reliability study. The mean duration of high intensity activity was 2.9 s. With reference to repeated work bouts (RWB), any recovery was found to be able to follow any burst using Chi Square test. Both percentage and frequency of high intensity activity were found to be significantly less in the second half than first half, with the % of high intensity activity dropping from 9.5±2.5% in the first half, to 7.8±2.4% in the second half. These findings can be used in elite football clubs, especially with the conditioning of players in preparation for the physical demands of a match, shown to be numerous high intensity bursts.
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