The accuracy of GPS devices to measure distance covered in team sports and their use as an alternative to photocells to evaluate sprint and RSA performance, has been described previously (Barbero-Alvarez et al., 2010; Coutts and Duffield, 2010). The purpose of the present study has been to determine the validility of the GPS device model (VX300) to asses performance in sprint and to determine its reproducibility test-retest. Methods: This study has been carried out in two parts involving 75 physically active athletes. The first test consisted in performing a lineal sprint of 50-m carrying the GPS (VX300) device, with timings taken through photocells at the distances of 30 and 50-m (N=75). The second phase consisted in repeating the same test with some of the athletes 6 hours later to measure the reproducibility (N=20). Results: The average time of the athletes at 30-m (T30) and 50-m (T50) were 4.5 and 7 s respectively, while the average time between these distances 30_50-m (T30_50) was 2.4 s. The information obtained using the GPS, shows that the average maximum peak in velocity (PS) was 30.9 km/h. There were significant correlations (P<0.01) between the T30 y PS (-0.89), between the T50 y PS (-0.91), and between the T30-50 y PS (-0.91). The results to determine the test-retest reliability during the lineal sprint show for the T30, T50 and PS some coefficients of variation (CV) de 0.9, 0.9, y 1.8% respectively. Discussion: The results of the study show that there exists a strong correlation between the times obtained through the photocells and the peak of speed reported by the GPS device. In spite of these high correlations, the results show a slight decrease in values found in another study however carried out with different devices and distances (Barbero-Alvarez et al., 2010).
© Copyright 2012 17th Annual Congress of the European College of Sport Science (ECSS), Bruges, 4. -7. July 2012. Julkaistu Tekijä Vrije Universiteit Brussel. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator