Accuracy of single beam timing lights for determining velocities in a flying 20-m sprint: Does timing light height matter?
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Title: | Accuracy of single beam timing lights for determining velocities in a flying 20-m sprint: Does timing light height matter? |
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Authors: | Altmann, Stefan | Spielmann, Max | Engel, Florian Azad | Ringhof, Steffen | Oriwol, Doris | Härtel, Sascha | Neumann, Rainer |
Keywords: | Sprint performance | Timing gates | Validity | High-speed video analysis | Photocells |
Knowledge Area: | Educación Física y Deportiva |
Issue Date: | 2018 |
Publisher: | Universidad de Alicante. Área de Educación Física y Deporte |
Citation: | Journal of Human Sport and Exercise. 2018, 13(3): 601-610. doi:10.14198/jhse.2018.133.10 |
Abstract: | Background: The purpose of this study was to evaluate the accuracy of timing lights (TL) at different heights for measuring velocities during sprinting. Methods: Two sets of single beam TL were used to determine velocities reached in a flying 20-m sprint in 15 healthy and physically active male participants. In TL64, all TL were set up at a height of 64 cm, and in TL100, all TL were set up at 100 cm, respectively. Participants performed three valid trials. The recordings of high-speed video cameras were used as a reference. Results: ICC and Pearson’s r values between both timing light heights and the reference system were almost perfect (0.969–0.991). Bland & Altman’s LOA (95 %) indicated low systematic and unsystematic errors, with somewhat smaller LOA for TL100 (-0.013–0.121 m/s) than for TL64 (-0.060–0.120 m/s). Measures of between-trial reliability of running velocities showed a high relative (ICC) and absolute (RMSE) reliability, with the reference system showing slightly better values in all reliability measures (ICC=0.935; RMSE<0.001 m/s) compared to TL64 and TL100 (ICC=0.894, 0.887; RMSE=0.107 m/s, 0.124 m/s, respectively). The usefulness, determined by comparing the typical error (TE) with the smallest worthwhile change (SWC), was considered as “OK” (TE ≈ SWC) for all three systems. Conclusions: Results suggest that TL at both heights (TL64 and TL100) can be considered as accurate, reliable, and useful in computing velocities during a flying 20-m sprint, and therefore can be recommended to both coaches and researchers. |
URI: | https://doi.org/10.14198/jhse.2018.133.10 | http://hdl.handle.net/10045/75448 |
ISSN: | 1988-5202 |
DOI: | 10.14198/jhse.2018.133.10 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | Licencia Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 |
Peer Review: | si |
Publisher version: | http://www.jhse.ua.es/ |
Appears in Collections: | Journal of Human Sport and Exercise - 2018, Vol. 13, No. 3 |
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