The validity and reliability of a novel mobile app to measure agility performance in the physically active youth population

Juan A. Escobar Álvarez, Rocío Carrasco-Zahínos, Pedro R. Olivares, Sebastián Feu, Robinson Ramírez-Velez, Miguel Ángel Pérez Sousa*

*Corresponding author for this work

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Abstract

Agility is a key component of physical fitness in adolescents. However, the measurement of this variable is usually complex, requiring high cost instruments and complex software. To test the validity and reliability of a novel iPhone app (Lap Tracker Auto-timer) to measure agility performance among adolescents. Twenty-four physically active adolescents (15.7 ± 2.3 years old) participated in two testing sessions (separated by 7 days). They performed three 4 x 10 m agility test trials measured by Photocell or the iPhone app. The correlation analysis revealed high validity (r = .92; 95% confidence interval [CI] = .88 – .95), with a standard error of the estimate of 0.56 s (p < 0.001). The coefficient of variation (CV; 0.09) and intraclass correlation coefficient (ICC; .93; 95% CI = .85 – .97) showed an acceptable reliability. This study demonstrated that the iPhone App Lap Tracker Auto-timer could be a valid, reliable and low-cost tool to evaluate agility performance in adolescents. However, more studies are required to guarantee the utility of this app.

Original languageEnglish
Article number9
Number of pages8
JournalEuropean Journal of Human Movement
Volume45
DOIs
Publication statusPublished - 31 Dec 2020
Externally publishedYes

Keywords

  • app
  • agility
  • validity
  • reliability

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