Accuracy of flight time and countermovement-jump height estimated from videos at different frame rates with MyJump
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Título: | Accuracy of flight time and countermovement-jump height estimated from videos at different frame rates with MyJump |
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Autor/es: | Pueo, Basilio | Hopkins, Will G. | Penichet-Tomás, Alfonso | Jimenez-Olmedo, Jose Manuel |
Grupo/s de investigación o GITE: | Health, Physical Activity, and Sports Technology (HEALTH-TECH) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Didáctica General y Didácticas Específicas |
Palabras clave: | Athletes | Linear mixed model | Measurement error | Reliability | Smartphone app |
Fecha de publicación: | 6-sep-2022 |
Editor: | Institute of Sport (Warsaw) |
Cita bibliográfica: | Biology of Sport. 2023, 40(2): 595-601. https://doi.org/10.5114/biolsport.2023.118023 |
Resumen: | Recent improvements in smartphone video technology may provide sufficient accuracy for estimation of jump height via flight time determined from video recordings of vertical-jump tests. The aim of this study is to evaluate the accuracy of jump height estimated from videos at different frame rates. Highdefinition videos of 10 young adults (6 males, 4 females) performing 5 countermovement jumps were recorded at a frame rate of 1000 Hz and transcoded to frame rates of 120, 240, and 480 Hz. Flight time in the videos was assessed independently by three observers at each of the four frame rates with MyJump. Flight time and jump height were analyzed with mixed models for estimation of means and of standard deviations representing technical error of measurement (free of within-subject jump-to-jump variability) at each frame rate. The four frame rates and three observers produced practically identical estimates of mean jump height. The technical errors at 120, 240, 480 and 1000 Hz were respectively 3.4, 1.8, 1.2 and 0.8 ms for flight time, and 1.4%, 0.7%, 0.5% and 0.3% for jump height. Assessed relative to either differences in jump height between elite football players (standard deviation of ~12%) or the smallest expected test-retest variability (typical error of ~3%), the technical error was substantial at 120 Hz but negligible at 240 Hz or higher. In conclusion, use of frame rates above 240 Hz to estimate jump height with MyJump will not improve accuracy substantially. |
Patrocinador/es: | This work was supported by Generalitat Valenciana (grant number GV/2021/098). |
URI: | http://hdl.handle.net/10045/126422 |
ISSN: | 0860-021X (Print) | 2083-1862 (Online) |
DOI: | 10.5114/biolsport.2023.118023 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © Institute of Sport. This is an Open Access article distributed under the terms of the Creative Commons Attribution Share Alike 4.0 License (https://creativecommons.org/licenses/by-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.5114/biolsport.2023.118023 |
Aparece en las colecciones: | INV - HEALTH-TECH - Artículos de Revistas |
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