The Validity and Reliability of 5-hZ Global Positioning System Units to Measure Team Sport Movement Demands

• Autores: Richard J. Johnston, Mark L. Watsford, Matthew J. Pine, Robert W. Spurrs, Aron J. Murphy, Elizabeth C. Pruyn
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 26, Nº. 3, 2012, págs. 758-765
• Idioma: inglés
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• Dialnet Métricas: 5 Citas
• Resumen

  • The purpose of this research was to investigate the validity and the reliability of 5-Hz MinimaxX global positioning system (GPS) units measuring athlete movement demands. A team sport simulation circuit (files collected from each unit = 12) and flying 50-m sprints (files collected from each unit = 34) were undertaken, during which the total distance covered; peak speed; player load; the distance covered; time spent and number of efforts performed walking, jogging, running, high-speed running, and sprinting were examined. Movement demands were also separately categorized into low-intensity activity, high-intensity running, and very high�intensity running. The results revealed that GPS was a valid and reliable measure of total distance covered (p > 0.05, percentage typical error of measurement [%TEM] < 5%) and peak speed (p > 0.05, %TEM 5�10%). Further, GPS was found to be a reliable measure of player load (%TEM 4.9%) and the distance covered, time spent, and number of efforts performed at certain velocity zones (%TEM <5% to >10%). The level of GPS error was found to increase along with the velocity of exercise. The findings demonstrated that GPS is capable of measuring movement demands performed at velocities <20 km·h-1, whereas more caution is to be exercised when analyzing movement demands collected by using GPS velocities >20 km·h-1.