Abstract
1 d erised by individuality, movement specificity and fficiency. Imbalances between training and cometitive games are emerging1 but definitive methds remain uncertain. The scientific contribution to est practice in sport requires dedicated research nd persuasive results. Advances in the technologies available for oneld sports performance analyses have increased xponentially in recent years. The use of motion nalysis technology to assess sports performance erves several purposes. Essentially, results from n-field training or game performances can proide biofeedback to participants, assist conditionng coaches to quantify and monitor individual volmes of physical loading and advance the knowldge of sports-specific physiological demands. But he underlying assumptions of validity in available echnology invite challenge from a sports specific erspective. yses. Precision of manufacturers’ claims have been confirmed for speed using cyclists in linear but not circular pathways,2 but evidence of instrument specificity for team sports is lacking in the literature. Performance can also be analysed using game-specific software either in real time or through the retrospective use of video tapes. In this issue of the journal, the relative validity of a GPS device and a separate tracking performance software system is compared for precision in distance against a well calibrated measurement of distance. It is the first peer-reviewed paper to present comparative results of these two measures commonly used in game analysis for team sports such as Australian football, rugby and soccer. The results show similar but acceptable errors in the two tracking devices for precision in measuring distances. However the precision differs from the The precision of motion analysis devices tareting sporting organisations is commercially mareted. A plethora of systems are available with commercially-marketed claims. This is not to suggest that manufactures’ claims are invalid. Rather, precision from these devices may be sport specific i m s f s
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