26/10/2026
To calculate reactive strength one of our favourite tests we employ is the 10/5 repeat jump test, utilizing a variation where athletes execute ten jumps, with the top five jumps contributing to the final test results. The decision to exclude lower-scoring repetitions from the analysis stems from the recognition that these jumps often yield lower Reactive Strength Index (RSI) due to postural deficiencies rather than the targeted properties we aim to measure.
While certain RSI tests retain all scores, the removal of lower-scoring repetitions has proven to be reliable in determining RSI across male, female, and mixed cohorts[. Like any assessment tool incorporated into our testing regimen, the test needs to exhibit a high level of reliability to facilitate meaningful comparisons between trials and enable effective athlete-to-athlete comparisons.
Additionally, the test has demonstrated limited familiarization benefits after the initial repetition, with research showing an 11.55% change between reps 1 and 2, with a modest maximum between rep change of 1.25% in trials 2-5.
To maintain consistency between test sessions and athletes and minimize potential deviations resulting from upper body movements, the test is conducted with participants adopting a hands-on-hips posture. This ensures a standardized approach and enhances the accuracy of the assessment.
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