Performance of the Yo-Yo Intermittent Recovery Test by elite professional and semiprofessional rugby league players

J Strength Cond Res. 2006 Feb;20(1):222-5. doi: 10.1519/R-16034.1.


The purpose of this study was to assess the performance of elite rugby league players by using the Yo-Yo Intermittent Recovery Test. Fifty players were recruited to the study during preseason and were classified as professional (P) or semiprofessional (SP). All performed the level 1 Yo-Yo Intermittent Recovery Test. Total distance achieved was taken as the performance index. Physiological (heart rate and blood lactate) correlates of performance were also assessed. Results showed that P players achieved a greater total distance than did SP players (p > 0.05). End heart rates did not differ significantly (p < 0.05). Semiprofessional players had significantly lower end blood lactate values than did P players (p < 0.05). Relationships between test performance and physiological variables were not significant (p > 0.05). These findings showed that P and SP players performed the test at a comparable level. Physiological indices indicated that performance was near maximal. The test is considered a useful measure of intermittent high-intensity performance for rugby league players.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Cross-Sectional Studies
  • Exercise Test*
  • Football / physiology*
  • Heart Rate / physiology
  • Humans
  • Lactic Acid / blood
  • Physical Fitness / physiology*
  • Recovery of Function / physiology*


  • Lactic Acid