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The Reliability of MinimaxX Accelerometers for Measuring Physical Activity in Australian Football

Boyd, Luke, Ball, Kevin and Aughey, Robert ORCID: 0000-0002-0285-8516 (2011) The Reliability of MinimaxX Accelerometers for Measuring Physical Activity in Australian Football. International Journal of Sports Physiology and Performance , 6 (3). pp. 311-321. ISSN 1555-0265 (print) 1555-0273 (online)

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Abstract

To assess the reliability of triaxial accelerometers as a measure of physical activity in team sports. Methods: Eight accelerometers (MinimaxX 2.0, Catapult, Australia) were attached to a hydraulic universal testing machine (Instron 8501) and oscillated over two protocols (0.5 g and 3.0 g) to assess within- and between-device reliability. A static assessment was also conducted. Secondly, 10 players were instrumented with two accelerometers during Australian football matches. The vector magnitude was calculated, expressed as Player load and assessed for reliability using typical error (TE) ± 90% confidence intervals (CI), and expressed as a coefficient of variation (CV%). The smallest worthwhile difference (SWD) in Player load was calculated to determine if the device was capable of detecting differences in physical activity. Results: Laboratory: Within- (Dynamic: CV 0.91 to 1.05%; Static: CV 1.01%) and between-device (Dynamic: CV 1.02 to 1.04%; Static: CV 1.10%) reliability was acceptable across each test. Field: The between-device reliability of accelerometers during Australian football matches was also acceptable (CV 1.9%). The SWD was 5.88%. Conclusions: The reliability of the MinimaxX accelerometer is acceptable both within and between devices under controlled laboratory conditions, and between devices during field testing. MinimaxX accelerometers can be confidently utilized as a reliable tool to measure physical activity in team sports across multiple players and repeated bouts of activity. The noise (CV%) of Player load was lower than the signal (SWD), suggesting that accelerometers can detect changes or differences in physical activity during Australian football.

Item Type: Article
Uncontrolled Keywords: ResPubID23485, ResPubID23504, reliability, accelerometers, contact-based team sports
Subjects: Faculty/School/Research Centre/Department > School of Sport and Exercise Science
FOR Classification > 1106 Human Movement and Sports Science
SEO Classification > 970111 Expanding Knowledge in the Medical and Health Sciences
Depositing User: VUIR
Date Deposited: 14 Aug 2012 05:10
Last Modified: 22 Mar 2019 04:07
URI: http://vuir.vu.edu.au/id/eprint/9088
DOI: https://doi.org/10.1123/ijspp.6.3.311
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Citations in Scopus: 212 - View on Scopus

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