(School of Physical Education,South China Normal University,Guangzhou 510006,China) Abstract: By means of experimental test method, the authors verified the reliability and validity of Catapult Optimeye S5, a wearable global positioning system, tracking football players’ running distances. The authors selected 10 university students as experiment objects, who completed 8 rounds of 60m straight line running, 50m turning straight line running and 40m Z-shape fold line running at different speeds. As tracked by the GPS, the experiment objects’ running distances in the tests were (57.65±2.76)m, (46.19±4.09)m and (36.50±2.59)m respectively. When the GPS tracked 60m straight line running, the experiment objects’ average within-player CV was 0.03 (0.01~0.05), their average within-player SE was 0.61 (between 0.25 and 1.06), their average Bias was 4.9% (1.8%~10.7%), their average SEE was 2.4% (between 1.8% and 3.0%); when the GPS tracked 50m turning straight line running,, the experiment objects’ average within-player CV was 0.06 (0.04 ~0.11), their average within-player SE was 1.05 (between 0.63 and 1.76), their average Bias was 8.4% (between 3.1% and 17.3%), their average SEE was 4.9% (between 2.2 and 10.3%); when the GPS tracked 40m Z-shape fold line running,, the experiment objects’ average within-player CV was 0.06 (between 0.03 and 0.11), their average within-player SE was 0.79 (between 0.42 and 1.51), their average Bias was 9.5% (between 3.8% and 14.4%), their average SEE was 4.6% (between 3.0% and 5.7%). The experiment results prove that the GPS Catapult Optimeye S5 equipment is provided with adequate accuracy when it tracks football players’ running distances, and the players’ moving data it tracks have adequate reliability and validity for the purposes of scientific research and coach guidance. Key words: competition and training;sports monitoring;football;running distance;global positioning system |