CHANGE-OF-DIRECTION DEFICIT VS. DECELERATION DEFICIT: A COMPARISON OF LIMB DOMINANCE AND INTER-LIMB ASYMMETRY BETWEEN FORWARDS AND BACKS IN ELITE MALE RUGBY UNION PLAYERS

The aims of the present study were to: 1) determine whether limb dominance and inter-limb asymmetry were the same across both change of direction (COD) and deceleration (DEC) deficits and, 2) determine the association between the COD and DEC-deficits and other physical performance tests in elite male rugby union players. Twenty-five players performed a series of bilateral jumps, linear and COD speed tests at the end of the pre-season period. COD and DEC-deficits were calculated for both left and right sides, and inter-limb asymmetry thereafter. Kappa coefficients revealed moderate levels of agreement in limb dominance between COD and DEC-deficits (Kappa = 0.41 on left; 0.48 on right). For the direction of asymmetry, perfect levels of agreement (Kappa = 1) were evident between 505 time and COD-deficit, but only moderate levels of agreement (Kappa = 0.41) between other asymmetry measures. Pearson’s r correlations showed moderate to large relationships between jumps and linear (r =-0.42 to-0.68) and COD speed (r =-0.41 to-0.58), but not with the COD-deficit (r = 0.15 to-0.31), DEC-deficit (r = 0.01 to-0.32) or asymmetry (r = 0.16 to-0.29). When analyzing by playing position, backs were significantly faster than forwards over 15-m (ES =-0.86) and across all jump tests (ES = 0.86-0.94), with the exception of the squat jump. This study is the first to provide a direct comparison of the COD and DEC-deficits and highlights that limb dominance and asymmetry cannot be guaranteed between tasks.