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Publications

Journal Article Ahead of print

PubMed: 40586697 DOI: 10.1080/14763141.2025.2524344

The My Jump Lab application is a valid and reliable low-cost alternative to test curved sprint performance.

Sports Biomech

Authors: Alberto Fílter, Jesús Olivares-Jabalera, Jose Vicente Beltrán-Garrido, Alfredo Santalla, Carlos Balsalobre-Fernández, Javier Gálvez, Blanca De-la-Cruz-Torres

Affiliations

  • FSI Lab, Football Science Institute, Granada, Spain.
  • Research Group Physical Activity, Health and Sport CTS-948, University Pablo de Olavide, Seville, Spain.
  • Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Granada, Spain.
  • Department of Education Sciences, School of Humanities and Communication Sciences, Universidad Cardenal Herrera-CEU, CEU Universities, Castellon de la Plana, Spain.
  • Physical Exercise and Performance Research Group, Universidad Cardenal Herrera-CEU, CEU Universities, Castellon de la Plana, Spain.
  • Applied Biomechanics and Sport Technology Research Group, Autonomous University of Madrid, Madrid, Spain.
  • Department of Physiotherapy, University of Seville, Seville, Spain.

Abstract

Curved sprinting has been proposed as a relevant and specific skill for soccer players' physical performance. However, professional timing systems are not always readily available in less resource-constrained environments. To address this issue, the development of a low-cost and user-friendly smartphone application could have practical applications for team sports staffs. In this context, the objective of this study was to evaluate the validity and reliability of the My Jump Lab application for the measurement of the curved sprint performance test. Correlational, comparative, and Bland-Altman analyses were conducted to assess the validity and reliability of the application in comparison with the gold-standard device. The results demonstrated excellent concurrent validity (r = 0.97-0.99, p < 0.001), and acceptable reliability (coefficient of variation < 3%, intraclass correlation coefficient = 0.88-0.96). Bland-Altman plots revealed small biases (-0.015 s and -0.010 s for the 17-m and 8.5 m curved sprints, respectively) and narrow 95% limits of agreement (-0.04 to 0.01 s and -0.03 to 0.01 s), indicating string agreement and no heteroskedasticity. Although small but significant differences were observed between test and retest sessions (p < 0.05), the overall findings support that My Jump Lab is a valid and reliable tool for assessing completion time during the curved sprint test in the specified arc, offering a cost-effective alternative for applied sport settings.

MeSH

Research Design, Sports