Research Impact: This study examined the interday reliability and usefulness of two repeated jump tests that are often used to assess an athlete’s plyometric capabilities. For a test to be of value it should be reliable and be able to detect meaningful change. Twenty male and 15 female field-sport players performed the two repeated jump protocols on two separate days. The key variable was reactive strength index (RSI). Both tests could reliably determine RSI. Only the 5 repetition jump test was able to detect the smallest worthwhile change for the female cohort. The tests demonstrated good reliability but usefulness was questionable.
Comyns T.M., Flanagan, E., Fleming, S., Fitzgerald, E., and Harper, D. (2019) Inter-day reliability and usefulness of reactive strength index derived from two maximal rebound jump tests. International Journal of Sports Physiology and Performance, 14 (9), 1200-1204 https://doi.org/10.1123/ijspp.2018-0829