Variability of Physical Performance and Player Match Loads in Professional Rugby Union

McLaren, S. J.; Weston, M.; Smith, A.; Cram, R.; Portas, M. D.

The objective of this study was to analyze the within- and between-player variability of physical performance and player match loads in professional rugby union.

Using microsensors, physical match performance data were collected from 28 male, professional, English Championship players over 15 competitive matches. The variables selected for analysis included total distance, low-speed running distance, high-speed running distance, very high-speed running distance, total impacts, repeated high-intensity efforts, body load (PlayerLoadTM), and low velocity body load. Ratings of perceived exertion were used to represent match internal loads.

The study found large between-match (within-player) variation for high-speed running distance, very high-speed running distance, total impacts, and repeated high-intensity efforts, with moderate variability for match ratings of perceived exertion, body load, and low velocity body load. Threshold values for likely substantial between-match changes in high-intensity physical performance measures ranged from 21% to 76%, and approximately 10% for match ratings of perceived exertion, body load, and low velocity body load.

In conclusion, the study revealed significant within- and between-player variability of high-intensity activity in professional rugby union. However, ratings of perceived exertion, body load, and low velocity body load appeared to be more stable and may be interpreted with greater accuracy compared to physical performance measures.