Abstract
This study aimed to examine the reliability, validity, and usefulness of the smartphone-based application, My Jump 2, against Optojump in recreationally active adults. Participants (18 women, 28.9 ± 5.6 years, and 26 men, 30.1 ± 10.6 years) completed squat jumps (SJ), counter-movement jumps (CMJ), and CMJ with arm swing (CMJAS) on Optojump and were simultaneously recorded using My Jump 2. To evaluate concurrent validity, jump height, calculated from flight time attained from each device, was compared for each jump type. Test-retest reliability was determined by replicating data analysis of My Jump 2 recordings on two occasions separated by two weeks. High test-retest reliability (Intraclass correlation coefficient (ICC) > 0.93) was observed for all measures in both male and female athletes. Very large correlations were observed between the My Jump 2 app and Optojump for SJ (r = 0.95, p = 0.001), CMJ (r = 0.98, p = 0.001), and CMJAS (r = 0.98, p = 0.001) in male athletes. Similar results were obtained for female recreational athletes for all jumps (r > 0.94, p = 0.001). The study results suggest that My Jump 2 is a valid, reliable, and useful tool for measuring vertical jump in recreationally active adults. Therefore, due to its simplicity and practicality, it can be used by practitioners, coaches, and recreationally-active adults to measure vertical jump performance with a simple test as SJ, CMJ, and CMJAS.
Highlights
Physical fitness is important for older adults to maintain their independence and enhance wellbeing [1]
Very large correlations were observed between the My Jump 2 app and Optojump for squat jumps (SJ) (r = 0.95, p = 0.001), counter-movement jumps (CMJ) (r = 0.98, p = 0.001), and CMJ with arm swing (CMJAS) (r = 0.98, p = 0.001)
The present study examined the concurrent validity and test-retest reliability of My Jump 2 installed on an iPhone X compared to a validated Optojump instrument for there is a great variety of testing methods and devices, and the majority of them are expensive and nonportable
Summary
Physical fitness is important for older adults to maintain their independence and enhance wellbeing [1]. It is of great importance to measure physical fitness in adults regularly. A fundamental step in jump training studies is a vertical jump test. It is a common method for assessing lower limb power in a physical education class, gym, or other sports programs [5]. It serves as an indicator of athletes fatigue during in-season [6]
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