Validity of 3 protocols for verifying VO2 max

Int J Sports Med. 2011 Apr;32(4):266-70. doi: 10.1055/s-0030-1269914. Epub 2011 Jan 26.


The verification bout has emerged as a technique for confirming 'true' VO2 max; however, validity during a single visit is unknown. We evaluated 3 different GXT durations with severe intensity verification bouts. On 3 separate days, in counterbalanced order, 12 recreational-trained men completed short (9±1 min), middle (11±1 min), and long (13±2 min) duration GXTs followed by exhaustive, sine wave verification bouts during the same visit. Intensities for verification were set at speeds equivalent to 2-stages minus end-GXT speed. No differences (p<0.05) in VO2 max (mL/kg/min) were observed between short (49.1), middle (48.2), and long (48.8) protocols. In addition, no differences in verification bout duration occurred between protocols (3±1 min). Validity of VO2 max was strongest for the middle duration protocol (ICC α=0.97; typical error=1 mL/kg/min; CV=2%). A small, but significantly higher HR (max) (∼1-2 bpm) was observed for the long protocol. Maximum respiratory exchange ratios were inconsistent (ICC α ranged 0.58-0.68). Our findings indicate GXT-verification bout testing during a single visit is a valid means of measuring 'true' VO2 max. The 10 min target for GXT duration was the optimum.

Publication types

  • Comparative Study
  • Validation Study

MeSH terms

  • Adult
  • Exercise Test / methods*
  • Humans
  • Male
  • Oxygen Consumption*
  • Physical Endurance / physiology
  • Physical Exertion / physiology
  • Running / physiology*
  • Time Factors
  • Young Adult