The validity and reliability of an iPhone app for measuring vertical jump performance

Abstract

The purpose of this investigation was to analyse the concurrent validity and reliability of an iPhone app (called: My Jump) for measuring vertical jump performance. Twenty recreationally active healthy men (age: 22.1 ± 3.6 years) completed five maximal countermovement jumps, which were evaluated using a force platform (time in the air method) and a specially designed iPhone app. My jump was developed to calculate the jump height from flight time using the high-speed video recording facility on the iPhone 5 s. Jump heights of the 100 jumps measured, for both devices, were compared using the intraclass correlation coefficient, Pearson product moment correlation coefficient (r), Cronbach's alpha (α), coefficient of variation and Bland-Altman plots. There was almost perfect agreement between the force platform and My Jump for the countermovement jump height (intraclass correlation coefficient = 0.997, P < 0.001; Bland-Altman bias = 1.1 ± 0.5 cm, P < 0.001). In comparison with the force platform, My Jump showed good validity for the CMJ height (r = 0.995, P < 0.001). The results of the present study showed that CMJ height can be easily, accurately and reliably evaluated using a specially developed iPhone 5 s app.

Assessing the Validity of the MyJump2 App for Measuring Different Jumps in Professional Cerebral Palsy Football Players: An Experimental Study (Preprint)

“…Our results are in agreement with two other studies that investigated the MyJump TM reproducibility in vertical jumps [14,15]. For example, Balsalobre-Fernandez et al [15] evaluated the app's validity to assess CMJ jump in 20 recreationally active healthy men compared to a force platform. They observed a near perfect correlation at jump height, which is pretty similar to that found in our results.…”

“…In this sense, the MyJump2 TM app becomes a viable option that evaluates the height of the jump. This app provides the data acquisition quickly and immediately, allowing easy monitoring in almost any environment [13], with a high reliability and reproducibility in vertical jumps [14][15][16]. However, it is necessary to validate this app in different populations and sports, which justifies the present study that aims to evaluate the reliability of the measures of the MyJump2™ app to assess vertical jumps in professional CP Football.…”

Bone age and height prediction of young Brazilian goalkeepers

“…He also reiterated that the development of anaerobic power occurs when submitted to systematic training and specialized sports, which makes it extremely important for the evaluation and follow-up of the athlete to obtain the rates of bone maturation, as a determining factor of the sports performance that will influence In the planning of the training load for better accuracy in the individualization, mainly in terms of methods and intensity. Following this line of reasoning, this study recommended the statistical comparison with the anaerobic power variable obtained by the MY JUMP vertical jump test, validated in the Balsalobre-Fernández study [8] , which showed a peak of out-ofcurve performance for the U-13 category, and came to contradict reference data from a large retrospective study by Deprez et al [25] that found statistical evolution of the performance of the physiological variable and anaerobic power only from the age of 16 years old on; That, above this age group, the results obtained here are aligned with the exponential development progression in this maturational period, which reflects the reach of the final stages, maintaining a better constancy of results and responsiveness to the training intervention.…”

“…The necessary data to the evaluations are: weight(Kg), lower limbs length (in centimeters) and height at 90º(in centimeters), these measures were taken with an anthropometric measuring tape(SannyBrasil, 2012); and the hangtime of each jump, was measured by the App. This test was made according to the Balsalobre-Fernándezprotocol [8] .…”

Jump height is a poor indicator of lower limb maximal power output: theoretical demonstration, experimental evidence and practical solutions

“…This is all the more important since jump height measurements/estimations alone show some clear limitations, as discussed in the previous sections. Interestingly, this method has been integrated in a very practical and reliable [51][52][53] smartphone app (MyJump2), allowing cheaper yet accurate computations of jump height and power output, from a simple high-speed video recording of the jumps.…”