BLUF High-speed running (>5 m·s-1) percentage in Japanese Rugby Union players was significantly correlated with short sprint times of 10 m (r = -0.63) and 20 m (r = -0.70) as well as jump height (r = 0.63). ABSTRACT The aim of this investigation was to explore the relationship between physical capacity and match running performance in professional Japanese rugby union players. Fifty professional players participated in this study with physical measures including; anthropometric values, vertical jump (VJ), 30 cm drop jump, broad jump (BJ), 10 m and 20 m sprint times, YoYo intermittent recovery test level 1 (YYIRT1) and one repetition maximum strength values collected. Match running performance was measured using Global Positioning Systems. Multiple significant relationships were found between physical capacity and match running performance. Match running percentage >5 m·s-1 was highly correlated (p < 0.01) with sprint times and jump height measures of VJ (r = 0.63), BJ (r = 0.59), 10 m (r = -0.63) and 20 m (r = -0.70). Similar relationships were found between VJ and total distance >5m·s-1 (r=0.60) and maximum velocity (0.42). Regression equations were also used to investigate predictive capabilities of physical capacity outcomes and match running performance. Significant relationships were found between performance variables and several match running outcomes including total distance, m·min-1, maximal running velocity, and movements above 5 m·s-1. For instance, it was identified that YYIRTL1 was predictive of total distance covered in matches (p =0.001). With this regression equations highlighting a two shuttle improvement (80m) in the YYIRTL1 potentially able to contribute to a 1.5% change in total distance covered per game. These findings emphasise the importance of developing physical capacity, particularly through the lower body, as there are clear links with these physical capacities and match running performance.
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