Validity and reliability of an alternative method for measuring power output during six-second all-out cycling

J Appl Biomech. 2014 Aug;30(4):598-603. doi: 10.1123/jab.2013-0317. Epub 2014 Jun 30.

Abstract

In a laboratory setting where both a mechanically-braked cycling ergometer and a motion analysis (MA) system are available, flywheel angular displacement can be estimated by using MA. The purpose of this investigation was to assess the validity and reliability of a MA method for measuring maximal power output (Pmax) in comparison with a force transducer (FT) method. Eight males and eight females undertook three identical sessions, separated by 4 to 6 days; the first being a familiarization session. Individuals performed three 6-second sprints against 50% of the maximal resistance to complete two pedal revolutions with a 3-minute rest between trials. Power was determined independently using both MA and FT analyses. Validity: MA recorded significantly higher Pmax than FT (P < .05). Bland-Altman plots showed that there was a systematic bias in the difference between the measures of the two systems. This difference increased as power increased. Repeatability: Intraclass correlation coefficients were on average 0.90 ± 0.05 in males and 0.85 ± 0.08 in females. Measuring Pmax by MA, therefore, is as appropriate for use in exercise physiology research as Pmax measured by FT, provided that a bias between these measurements methods is allowed for.

Publication types

  • Validation Study

MeSH terms

  • Algorithms*
  • Bicycling / physiology*
  • Energy Transfer / physiology*
  • Exercise Test / instrumentation
  • Exercise Test / methods*
  • Female
  • Humans
  • Image Interpretation, Computer-Assisted / methods
  • Male
  • Photography / methods*
  • Physical Endurance / physiology*
  • Physical Exertion / physiology*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Young Adult