Int J Sports Med 2008; 29(4): 307-315
DOI: 10.1055/s-2007-965357
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Predicting Intermittent Running Performance: Critical Velocity versus Endurance Index

M. Buchheit1 , 2 , P. B. Laursen3 , G. P. Millet4 , F. Pactat5 , S. Ahmaidi1
  • 1Laboratoire de Recherche Adaptations Réadaptations, Faculté des Sciences du Sport, Amiens, France
  • 2Faculté de Medecine, Institut de Physiologie, Strasbourg, France
  • 3School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, Australia
  • 4Academy for Sports Excellence, ASPIRE, Doha, Qatar
  • 5UFRSTAPS, Groupe d 'Analyse et d'Optimisation de la Performance, Strasbourg, France
Further Information

Publication History

accepted after revision March 9, 2007

Publication Date:
18 September 2007 (online)


The aim of the present study was to examine the ability of the critical velocity (CV) and the endurance index (EI) to assess endurance performance during intermittent exercise. Thirteen subjects performed two intermittent runs: 15-s runs intersected with 15 s of passive recovery (15/15) and 30-s runs with 30-s rest (30/30). Runs were performed until exhaustion at three intensities (100, 95 and 90 % of the speed reached at the end of the 30 - 15 intermittent fitness test, VIFT) to calculate i) CV from the slope of the linear relationship between the total covered distance and exhaustion time (ET) (iCV); ii) anaerobic distance capacity from the y-intercept of the distance/duration relationship (iADC); and iii) EI from the relationship between the fraction of VIFT at which the runs were performed and the log-transformed ET (iEI). Anaerobic capacity was indirectly assessed by the final velocity achieved during the Maximal Anaerobic Running Test (VMART). ET was longer for 15/15 than for 30/30 runs at similar intensities. iCV15/15 and iCV30/30 were not influenced by changes in ET and were highly dependent on VIFT. Neither iADC15/15 nor iADC30/30 were related to VMART. In contrast, iEI15/15 was higher than iEI30/30, and corresponded with the higher ET. In conclusion, only iEI estimated endurance capacity during repeated intermittent running.


Dr. Martin Buchheit

Faculté des Sciences du Sport
Laboratoire de Recherche Adaptations Réadaptations

Allée P Grousset

80025 Amiens


Phone: + 33 3 22 82 89 36

Fax: + 33 3 22 82 79 10

Email: [email protected]