Abstract
My Jump 2 is a mobile application that is objectively valid and reliable to measure vertical jumping height. The objectives of this study are to find the inter-rater and intra-rater reliability of the My Jump 2 mobile application in measuring countermovement jump (CMJ) height. A total of 25 male recreational athletes performed CMJ for five attempts and was recorded by using iPhone 7 Plus in 240 frames per second. The videos were then rated by three raters and rated again seven days later using the My Jump 2 mobile application. An excellent degree of reliability was found between rater measurements. The average measure ICC was 1.00 with a 95% confidence interval from 1.00 to 1.000 (F(124,248)= 18867201.171, p<.001). An excellent degree of reliability was found within rater measurements. The average measure ICC was 1.00 with a 95% confidence interval from 1.00 to 1.00 (F (124,124) = 44750598.291, p<.001). This study provides evidence in supporting the use of the My Jump 2 mobile application to measure the height of the countermovement jump in a research setting. Future research is needed to study the validity and reliability of other parameters possibly measured by the My Jump 2 mobile application like force-velocity profile, jumping launch force, and power.
Highlights
The ability of modern mobile phones to record videos as high as 240 frames per second is considered very useful for analyzing the movement of participants [1, 2]
An excellent degree of reliability was found between rater measurements (Table 1)
The average measure ICC was 1.00 with a 95% confidence interval from 1.00 to 1.000 (F(124,248)= 18867201.171, p
Summary
The ability of modern mobile phones to record videos as high as 240 frames per second is considered very useful for analyzing the movement of participants [1, 2]. One of the rising mobile applications recognized as valid and reliable today is the My Jump 2 mobile application [3] This mobile application was developed ad hoc by a researcher to find a new valid, reliable, and simple way to measure jumping height in the sample. The My Jump 2 mobile application developer claimed that this mobile application was rebuilt from scratch and used a more complicated algorithm. After several updates, this mobile application could calculate and project more complex tasks such as the force-velocity profile. Human factors during testing lead to systematic bias [4]
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