Metabolic Power and Energetic Costs of Professional Australian Football Match-Play

Coutts, A.J., Kempton, T., Sullivan, C., Bilsborough, J., Cordy, J., Rampinini, E.

Objectives: To compare the metabolic power demands between positional groups, and examine temporal
changes in these parameters during Australian Football match-play.
Design: Longitudinal observational study.
Methods: Global positioning system data were collected from 39 Australian Football players from the
same club during 19 Australian Football League competition games over two seasons. A total of 342
complete match samples were obtained for analysis. Players were categorised into one of six positional
groups:tall backs, mobile backs, midfielders,tall forwards, mobile forwards and rucks. Instantaneous raw
velocity data obtained from the global positioning system units was exported to a customised spreadsheet
which provided estimations of both speed-based (e.g.total and high-speed running distance) and derived
metabolic power and energy expenditure variables (e.g. average metabolic power, high-power distance,
total energy expenditure).
Results: There were significant differences between positional groups for both speed-based and metabolic
power indices, with midfielders covering more total and high-speed distance, as well as greater average
and overall energy expenditure compared to other positions (all p < 0.001). There were reductions in total, high-speed, and high-power distance, as well as average metabolic power throughout the match (all p < 0.001). Conclusions: Positional differences exist for both metabolic power and traditional running based vari- ables. Generally, midfielders, followed by mobile forwards and mobile backs had greater activity profiles compared to other position groups. We observed that the reductions in most metabolic power vari- ables during the course of the match are comparable to traditional running based metrics. This study demonstrates that metabolic power data may contribute to our understanding of the physical demands of Australian Football.

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