Validity of a trunk-mounted accelerometer to measure physical collisions in contact sports
(Validität eines am Rumpf befestigten Beschleunigungsmessers zur Messung von Körperzusammenstößen in Kontaktsportarten)
Context: Accelerometer peak impact accelerations are being used to measure player physical demands in contact sports. However, their accuracy to do so has not been ascertained. Purpose: To compare peak-impact-acceleration data from an accelerometer contained in a wearable tracking device with a 3-dimensional motion-analysis (MA) system during tackling and bumping. Methods: Twenty-five semielite rugby athletes wore a tracking device containing a 100-Hz triaxial accelerometer (MinimaxX S4, Catapult Innovations, Australia). A single retroreflective marker was attached to the device, with its position recorded by a 12-camera MA system during 3 physical-collision tasks (tackle bag, bump pad, and tackle drill; N = 625). The accuracy, effect size, agreement, precision, and relative errors for each comparison were obtained as measures of accelerometer validity. Results: Physical-collision peak impact accelerations recorded by the accelerometer overestimated (mean bias 0.60 g) those recorded by the MA system (P < .01). Filtering the raw data at a 20-Hz cutoff improved the accelerometer`s relationship with MA data (mean bias 0.01 g; P > .05). When considering the data in 9 magnitude bands, the strongest relationship with the MA system was found in the 3.0-g or less band, and the precision of the accelerometer tended to reduce as the magnitude of impact acceleration increased. Of the 3 movements performed, the tackle-bag task displayed the greatest validity with MA. Conclusions: The findings indicate that the MinimaxX S4 accelerometer can accurately measure physical-collision peak impact accelerations when data are filtered at a 20-Hz cutoff frequency. As a result, accelerometers may be useful to measure physical collisions in contact sports.
© Copyright 2015 International Journal of Sports Physiology and Performance. Alle Rechte vorbehalten.
Schlagworte: | Messverfahren Beschleunigung Bewegung Analyse Spielsportart Rugby Kampfsport |
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Notationen: | Spielsportarten Kampfsportarten |
DOI: | 10.1123/ijspp.2014-0381 |
Veröffentlicht in: | International Journal of Sports Physiology and Performance |
Veröffentlicht: |
2015
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Jahrgang: | 10 |
Heft: | 6 |
Seiten: | 681-686 |
Dokumentenarten: | Artikel |
Sprache: | Englisch |
Level: | hoch |