Validity and intra-rater reliability of MyJump app on iPhone 6s in jump performance

Robert Stanton, Sally Anne Wintour, Crystal O. Kean

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


Objectives Smartphone applications are increasingly used by researchers, coaches, athletes and clinicians. The aim of this study was to examine the concurrent validity and intra-rater reliability of the smartphone-based application, MyJump, against laboratory-based force plate measurements. Design Cross sectional study. Methods Participants completed counter-movement jumps (CMJ) (n = 29) and 30 cm drop jumps (DJ) (n = 27) on a force plate which were simultaneously recorded using MyJump. To assess concurrent validity, jump height, derived from flight time acquired from each device, was compared for each jump type. Intra-rater reliability was determined by replicating data analysis of MyJump recordings on two occasions separated by seven days. Results CMJ and DJ heights derived from MyJump showed excellent agreement with the force plate (ICC values range from 0.991 for CMJ to 0.993) However mean DJ height from the force plate was significantly higher than MyJump (mean difference: 0.87 cm, 95% CI: 0.69–1.04 cm). Intra-rater reliability of MyJump for both CMJ and DJ was almost perfect (ICC values range from 0.997 for CMJ to 0.998 for DJ); however, mean CMJ and DJ jump height for Day 1 was significantly higher than Day 2 (CMJ: 0.43 cm, 95% CI: 0.23–0.62 cm); (DJ: 0.38 cm, 95% CI: 0.23–0.53 cm). Conclusion The present study finds MyJump to be a valid and highly reliable tool for researchers, coaches, athletes and clinicians; however, systematic bias should be considered when comparing MyJump outputs to other testing devices.

Original languageEnglish
Pages (from-to)518-523
Number of pages6
JournalJournal of Science and Medicine in Sport
Issue number5
Publication statusPublished - 1 May 2017
Externally publishedYes


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