Feasibility and Reliability of the My Jump 2 Application in Measuring Power, Time and Jump Height in Physically Active Subjects

Background and Objective: Jumping assessment is often used for evaluating muscle strength and power. The reliability of My Jump 2 (MJ2), an application (app) used for this assessment, was investigated in this study. Two commonly used jumps, the counter movement jump (CMJ) and squat jump (SJ), were analysed for additional metrics provided by this app and to additionally validate the provided data. Materials and Methods: Thirty-eight undergraduate sports sciences students, participated in this study performing three jumps of each type in a randomized order. All jumps were performed on a contact mat and simultaneously recorded by a slow-motion camera. Two independent researchers evaluated the data. Intraclass correlation coefficient (ICC), coefficient of variation (CV), and agreement were used for comparison. Results: Excellent reliability (ICC > 0.9) and high agreement were observed in both jumps for flight time and jump height. Moreover, a low variation was present, except for CMJ height. Nevertheless, both jumps' reliability and agreement for power were low (ICC < 0.5). Conclusion: The results of the present study suggests that MJ2 app is a reliable and valid tool for assessing jump height and flight time, regardless of the device used for data analysis. However, with regards to power data, the app showed different results compared to the contact platform, possibly due to the indirect methods used to estimate power. Based on the results of the present study, the My Jump 2 app can be used as a valid mean of measuring flight time and jump height. Further research is needed to explore the reliability of other metrics provided by the app.