A single-session testing protocol to determine critical power and W'

Keren Constantini, Surendran Sabapathy, Troy J. Cross*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purpose: Critical power (CP), and the finite capacity to perform work above CP (W'), can be determined using a 3-min "all-out" cycling test (3MT). This protocol requires two laboratory visits: an incremental exercise test, followed by a 3MT on a separate day. The purpose of this study was to establish whether an incremental exercise test and a 3MT performed during a single laboratory visit can be used to accurately determine CP and W'. Methods: Twelve participants completed two experimental protocols: (1) Combined protocol: an incremental exercise test followed by a 3MT, with 20 min of recovery between exercise bouts; and (2) Independent protocol: the conventional 3MT protocol, performed on a separate day. Results: CP determined from the Combined (254 ± 117 W) and Independent (256 ± 118 W) protocols were not different (p = 0.40). Similarly, W' was not different (p = 0.96) between the Combined (13.7 ± 3.9 kJ) and Independent (13.7 ± 4.5 kJ) protocols. Linear regression revealed a strong level of measurement agreement between the protocols for CP and W', evidenced by high R 2 values (≥0.85) and marginal standard errors of the estimates (CP = 5 W; W' = 1.81 kJ). Conclusion: A Combined protocol, consisting of an incremental exercise test followed by a 3MT, provides an accurate and valid method to determine an individual's CP and, to a lesser extent, W'. Furthermore, this protocol permits the measurement of the gas-exchange threshold and peak O2 uptake and, consequently, the moderate, heavy, and severe exercise-intensity domains may be defined within a single exercise-testing session.

Original languageEnglish
Pages (from-to)1153-1161
Number of pages9
JournalEuropean Journal of Applied Physiology
Issue number6
StatePublished - Jun 2014
Externally publishedYes


  • Aerobic fitness
  • Cycling endurance
  • Supramaximal exercise


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