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Criterion Validity of Catapult ClearSky T6 Local Positioning System for Measuring Inter-Unit Distance

By Ryan Hodder, Kevin Ball and Fabio Serpiello


The validity of a local positioning system (LPS) to measure inter-unit distance was investigated during a team sport movement circuit. Eight recreationally active, female indoor team-sport players completed a circuit, comprising seven types of movements (walk, jog, jump, sprint, 45° change of direction and shuffle), on an indoor court. Participants wore a receiver tag (ClearSky T6, Catapult Sports) and seven reflective markers, to allow for a comparison with the reference system (©Vicon Motion Systems, Oxford Metrics, UK). Inter-unit distance was collected for each combination of participants. Validity was assessed via root mean square error, mean bias and percentage of variance accounted for, both as an overall dataset and split into distance bands. The results presented a mean root mean square error of 0.20 ± 0.05 m, and mean bias detected an overestimation for all distance bands. The LPS shows acceptable accuracy for measuring inter-unit distance, opening up opportunities to utilise player tracking for tactical variables indoors

Topics: 1106 Human Movement and Sports Science, Institute for Health and Sport, multipath propagation, inter-unit distance accuracy, team tactical synchronisation, inter-playerinteractions, coordination tendencies
Publisher: 'MDPI AG'
Year: 2020
DOI identifier: 10.3390/s20133693
OAI identifier:

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