Makaracı, YücelNas, KazımGündüz, KeremUysal, AbdullahOrange, Samuel T.Ruiz-Cardenas, Juan D.2025-01-122025-01-122024Makaracı, Y., Nas, K., Gündüz, K., Uysal, A., Orange, S. T., & Ruiz-Cárdenas, J. D. (2024). Validity and Test–Retest Reliability of a Smartphone App for Measuring Rising Time, Velocity, Power, and Inter-Limb Asymmetry During Single-Leg Sit-to-Stand Test in Female-Trained Athletes. Measurement in Physical Education and Exercise Science, 28(4), 391–400. https://doi.org/10.1080/1091367X.2024.23770961091-367X1532-7841https://doi.org/10.1080/1091367X.2024.2377096https://hdl.handle.net/11492/10235The aim was to determine the validity and test - retest reliability of the Sit to Stand App variables (rising time, vertical velocity, and power) for measuring single-leg sit-to-stand (STS) test compared to those derived from ground reaction force data. Twenty-seven female athletes performed the single-leg STS test over three consecutive sessions simultaneously recorded with a force plate and the smartphone app. Validity was assessed with Pearson's correlation coefficient, intra-class correlation coefficient (ICC), and percentage error. Reliability was assessed with the ICC. Almost perfect correlations (r >= 0.95) and excellent agreement (ICC = 0.96-0.97) between the app and force plate measures with low percentage errors (<= 7.3%) were found. The app showed good-to-excellent reliability (ICC = 0.88-0.92) with no differences in inter-limb asymmetry over three sessions. The app was highly valid and reliable for measuring single-leg STS performance. Practitioners can use this app to assess lower-limb performance in female athletes.enLower ExtremityMobile AppTehabilitationReliabilitySymmetryArticle284391400info:eu-repo/semantics/closedAccess2-s2.0-85198515296WOS:00127109910000110.1080/1091367X.2024.2377096Q2N/A