Interlimb asymmetry in collegiate American football players: Effects on combine-related performance

The assessment of interlimb asymmetry has been of interest to researchers and practitioners who desire to maximize sport performance. The aim of this study was to explore the relationships between interlimb asymmetry and Combine-related performance testing in collegiate American football players. Twenty-four skill position players (e.g., running backs, defensive backs, and wide receivers) from a Division II university completed all study-related procedures including unilateral countermovement (CMJ) and drop jumps on a force plate, 3-repetition maximum Bulgarian split squats with bar movement tracked by a 3D motion capture system, and their annual spring performance tests (L-drill, pro-agility, 40-yard dash, broad jump, and vertical jump). Using an alpha-level of .05, significant, positive Spearman’s correlations between performance in the L-drill test (Change of Direction test; CoD) and asymmetries in mean peak velocity ( r s = .491, p = .015), mean peak power ( r s = .467, p = .021), and mean average power ( r s = .455, p = .026) were observed. A significant, negative Pearson correlation between unilateral CMJ height asymmetry and vertical jump performance was observed ( r = .578, p = .003). Asymmetry in mean peak velocity, mean peak power, and mean average power may negatively influence CoD ability within collegiate American football players.