Score-line effect on work-rate in English Premier League soccer
The times at which goals were scored were used to determine the percentage of time players spent performing high intensity activity (%HI) when their team was level, ahead and behind. Data were only included for analysis when the score-line was constant for at least 15 minutes (Redwood-Brown et al., 2009). There were only two players whose team was level, ahead and behind for at least 15 minutes during the matches observed. Therefore, two separate analyses were done; players whose teams were level and ahead during the game (LA group) and players whose teams were level and behind during the game (LB group). The LA group consisted of 12 players and the LB groups consisted of 7 players. 2.2. Time-motion analysis The CAPTAIN system is a computerised time-motion analysis system that can be tailored for use with any movement classification scheme of up to 9 movement classes (O’Donoghue, 1998). The current study used a classification scheme of the following 7 movements defined by Huey et al. (2001): • Standing, any time the subject spends stationary, this includes standing, lying
or sitting down and is not in possession of the football. • Walking, walking in a forward direction and not in possession of the football. • Backing, low intensity backwards and sideward motion and not in possession of
the football. • Jogging, low intensity running in a forward direction, without possession of the
football. • Running, high intensity running with significant effort and not in possession of
the football. • Shuffling, high intensity backwards, sideways and on the spot movement
requiring significant effort. • Football, any time the subject has possession of the football during the match
(including stoppage time).