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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

2020; Taylor & Francis; Volume: 39; Issue: 10 Linguagem: Inglês

10.1080/02640414.2020.1857578

ISSN

1466-447X

Autores

Chris Bishop, Richard Clarke, Tomás T. Freitas, Ademir Felipe Schultz de Arruda, Aristide Guerriero, Maurício S. Ramos, Lucas A. Pereira, Irineu Loturco,

Tópico(s)

Sport Psychology and Performance

Resumo

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 analysing 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.

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