- The countermovement jump assessment (CMJ) as described is homoscedastic, meaning the test is reliable for all measured variables regardless of skill level.
- The CMJ test can be performed without the need for familiarization trials.
- The CMJ test is a reliable measure of assessing vertical JUMP HEIGHT.
- A change in LOAD, EXPLODE, or DRIVE by 1 t-score is a significant change.
- The EXPLODE and DRIVE variables are highly reliable and can be used to determine real changes in performance.
- LOAD is highly variable, however changes in LOAD may be considered sensitive to training responses and fatigue.
SUMMARYThe questions covered:
- If an athlete performs a vertical jump test and improves their results each time, are the improvements a result of improved athletic ability? Or, is the athlete learning how to perform the test better? (i.e. ‘cheat’ the test to get a better result).
- Is there greater reliability in vertical jump results for professional athletes compared to high school or college athletes?