The validity and reliability of a novel app for the measurement of change of direction performance

Balsalobre-Fernández, Carlos ORCID: https://orcid.org/0000-0002-8329-1581, Bishop, Chris, Beltrán-Garrido, José Vicente ORCID: https://orcid.org/0000-0001-9286-8453, Cecilia-Gallego, Pau, Cuenca-Amigó, Aleix, Romero-Rodríguez, Daniel and Madruga-Parera, Marc (2019) The validity and reliability of a novel app for the measurement of change of direction performance. Journal of Sports Sciences . ISSN 0264-0414 (Published online first) (doi:10.1080/02640414.2019.1640029)

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Abstract

The aim of the present investigation was to analyze the validity and reliability of a novel iPhone app (CODTimer) for the measurement of total time and interlimb asymmetry in the 5 + 5 change of direction test (COD). To do so, twenty physically active adolescent athletes (age = 13.85 ± 1.34 years) performed six repetitions in the COD test while being measured with a pair of timing gates and CODTimer. A total of 120 COD times measured both with the timing gates and the app were then compared for validity and reliability purposes. There was an almost perfect correlation between the timing gates and the CODTimer app for the measurement of total time (r = 0.964; 95% Confidence interval (CI) = 0.95-1.00; Standard error of the estimate = 0.03 s.; p < 0.001). Moreover, non-significant, trivial differences were observed between devices for the measurement of total time and interlimb asymmetry (Effect size < 0.2, p > 0.05). Similar levels of reliability were observed between the timing gates and the app for the measurement of the 6 different trials of each participant (Timing gates: Intraclass correlation coefficient (ICC) = 0.651-0.747, Coefficient of variation (CV) = 2.6-3.5%; CODTimer: ICC = 0.671-0.840, CV = 2.2-3.2%). The results of the present study show that change of direction performance can be measured in a valid, reliable way using a novel iPhone app.

Item Type: Article
Keywords (uncontrolled): Sprinting, agility, biomechanics, smartphone, technology
Research Areas: A. > School of Science and Technology > London Sport Institute
Item ID: 27161
Notes on copyright: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Sports Sciences on 29/06/2019, available online: http://www.tandfonline.com/10.1080/02640414.2019.1640029
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Depositing User: Jisc Publications Router
Date Deposited: 19 Jul 2019 08:06
Last Modified: 22 Jul 2019 10:23
URI: https://eprints.mdx.ac.uk/id/eprint/27161

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