Resumen de Physical and Decision-Making Demands of Australian Football Umpires During Competitive Matches.
Nathan Elsworthy, Darren G. Burke, Brendan R. Scott, Christopher J. Stevens, Benjamin J. Dascombe
This study examined the physical and decision-making requirements of elite Australian football (AF) umpires during match play. Twenty-nine field umpires were assessed across 20 AF League matches. Physical demands were monitored using global positioning system devices to record the total distance covered and high-speed running (HSR; >14.4 km[middle dot]h-1) demands across each quarter. Decision-making performance was assessed through video by 3 elite umpire coaches who reviewed free-kick accuracy during each match. These data were further analyzed according to the position (mid-zone or end-zone) of the umpire when each decision was made. The average distance covered was 10,563 +/- 608 m, of which 1,952 +/- 494 m was HSR. Significant reductions in distance covered were observed during the third (p = 0.006) and fourth (p = 0.001) quarters, compared with the first. An average of 44 +/- 8 free kicks awarded per match with a decision accuracy of 84 +/- 6%; however, there were no significant differences (p > 0.05) in these measures across a match. Significantly (p <= 0.05) higher physical (HSR; relative distance) and decision-making requirements were observed within the mid-zone. The current data quantify the physical and decision-making demands of AF umpiring and demonstrated that despite a high physical workload, free-kick accuracy is maintained across a match. This suggests that decision making may not be directly compromised by the intermittent running demands of AF umpires. Positional rotations between the mid-zone and end-zone position allow for the demands to be shared among all field umpires during a match.
