Young et al (1) examined whether height of a loaded countermovement jump could be improved if preceded by a set of heavy squats. 10 experienced subjects performed 2 sets of 5 loaded countermovement jumps with 4 minute rests between sets. The subjects then performed 1 set of half-squats for 5 RM. After another 4 minute rest, subjects performed another set of 5 loaded countermovement jumps. FINDINGS: There were no significant differences in mean height between the first 2 sets of jumps. However, mean height for the set of jumps following the set of half-squats was significantly greater (2.8%) than the first 2 sets of jumps. A significant correlation (r=.73) between 5 RM performance and increase in jump height was found.. IMPLICATIONS: Performing a set of heavy half-squats prior to loaded countermovement jump testing can enhance jumping performance. The data from this study also suggests that stronger individuals with better performance at 5 RM loads will achieve greater improvements as a result of performing squats prior to testing.
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