20.500.12556/RUL-133680 Validity, reliability, and usefulness of My Jump 2 app for measuring vertical jump in primary school children There is a persistent need in sport science for developing a measuring tool that is affordable, portable, and easy to use. We aimed to examine the concurrent validity and test–retest reliability of the My Jump 2 app compared to a validated OptoJump instrument for measuring jump performance during the squat jump (SJ), countermovement jump (CMJ), and CMJ free arms (CMJAM) in primary school children. A total of 48 participants (11–14 years age), volunteered to participate in this research. The jumps were recorded with a validated OptoJump photoelectric cell system and a concurrent device (iPhone X through My Jump 2 app) at the same time. The participants repeated the testing procedure after two weeks to assess the reliability of the measurements (ICC). Systematic bias between sessions and tools was evaluated using the paired samples t-test and Bland and Altman analysis. High test–retest reliability (ICC > 0.89) was observed for all measures’ in-between conditions. Very large correlations in the total sample were observed between the My Jump 2 app and OptoJump for SJ (r = 0.97, p = 0.001), CMJ (r = 0.97, p = 0.001), and CMJAM (r = 0.99, p = 0.001). Bland and Altman’s plot depicting limits of agreement for the total sample between the OptoJump and My Jump 2 show that the majority of data points are within the 95% CIs. The results of this study suggest that My Jump 2 is a valid, reliable, and useful tool for measuring jump performance in primary school children. sport young adolescents jumping ability assessment physical education testing šport mladi najstniki adolescenti skakanje uspeh športna vzgoja testiranje true false true Angleški jezik Slovenski jezik Članek v reviji 2021-12-08 15:00:07 2021-12-08 15:00:09 2022-09-13 03:52:02 0000-00-00 00:00:00 2020 0 0 12 str. iss. 10, art. 3708 Vol. 17 May 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 796.01-053.6 1660-4601 10.3390/ijerph17103708 17296643 RAZ_Bogataj_Spela_2020.pdf RAZ_Bogataj_Spela_2020.pdf 1 BA0C33857966E71E396F0B0F512F5C74 242c28372dbf0d134c955fd73e15a4711440550c76fd863b79086e63eea8881e 3fff8376-582f-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151948 https://www.mdpi.com/1660-4601/17/10/3708 1 0c185853-582f-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151947 Fakulteta za šport 0 0 0