The validity and test-retest reliability of “My Jump 2”, “HomeCourt” & “Takei Vertical Jump Meter” for measuring countermovement jump

Wai Yan PUN

Research output: ThesisHonours Projects (HP)


Purpose: This study aims to investigate the validity and test-retest reliability of the remote assessments of countermovement jumps via three remote assessments.
Methods: Thirty physically active healthy students from the Education University of Hong Kong (EdUHK) (age 23.03 ± 1.67 years; body mass: 61.89 ± 9.82 kg; height: 167.86 ± 6.27 cm) were recruited for the study voluntarily. The participants performed three countermovement jumps (CMJ) in a session with two days interval for test-retest reliability. The jumps were recorded and assessed by the Takei Vertical Jump Meter (the Takei) and two mobile devices “HomeCourt” and “My Jump 2” at the same time to measure the validity.
Results: There are high intraclass correlation coefficients (ICCs) were perceived (within-day mean = 0.85; between-day mean = 0.86, My Jump 2, HomeCourt & the Takei) in all measurements and factors. There was no significant systematic bias ± random errors (p > 0.05) between test-retest. Similar coefficients of variation (CV) were shown in all measurements. The Takei showed the lowest CV (< 3%) in both factors. Acceptable and good correlations were observed between three measurements (r= 0.81.- 0.87). The Takei performed the lowest minimal detectable change (MDC ± 4.59cm) result in the between day trial compared with others.
Conclusion: This study finds My Jump 2, HomeCourt and the Takei showed reliable and valid information on the CMJ performance. To compare the MDC of the Takei, remote assessments require larger improvements of CMJ. It can be concluded that the remote assessment is still in the development process.
Original languageEnglish
QualificationBachelor of Education (Honours)
  • CHOW, Chi Ching 周志清, Supervisor
Publication statusPublished - 2021


  • Countermovement jump
  • Remote assessment
  • Test-retest reliability
  • Validity
  • ICC
  • MDC
  • Honours Project (HP)
  • Bachelor of Education (Honours) (Physical Education) (Five-year Full-time)
  • Programme code: A5B062
  • Course code: PES4903


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