title: Validity, Sensitivity, Reproducibility, and Robustness of the PowerTap, Stages, and Garmin Vector Power Meters in Comparison With the SRM Device.
abstract: A large number of power meters have been produced on the market for nearly 20 y according to user requirements.
  
  
  OBJECTIVE
  To determine the validity, sensitivity, reproducibility, and robustness of the PowerTap (PWT), Stages (STG), and Garmin Vector (VCT) power meters in comparison with the SRM device.
  
  
  METHODS
  A national-level male competitive cyclist completed 3 laboratory cycling tests: a submaximal incremental test, a submaximal 30-min continuous test, and a sprint test. Two additional tests were performed, the first on vibration exposures in the laboratory and the second in the field.
  
  
  RESULTS
  The VCT provided a significantly lower 5-s power output (PO) during the sprint test with a low gear ratio than the SRM did (-36.9%). The STG PO was significantly lower than the SRM PO in the heavy-exercise-intensity zone (zone 2, -5.1%) and the low part of the severe-intensity zone (zone 3, -4.9%). The VCT PO was significantly lower than the SRM PO only in zone 2 (-4.5%). The STG PO was significantly lower in standing position than in the seated position (-4.4%). The reproducibility of the PWT, STG, and VCT was similar to that of the SRM system. The STG and VCT PO were significantly decreased from a vibration frequency of 48 Hz and 52 Hz, respectively.
  
  
  CONCLUSIONS
  The PWT, STG, and VCT systems appear to be reproducible, but the validity, sensitivity, and robustness of the STG and VCT systems should be treated with some caution according to the conditions of measurement.
authors.forename: Anthony
authors.initials: A
authors.lastname: Bouillod
authors.forename: Julien
authors.initials: J
authors.lastname: Pinot
authors.forename: Georges
authors.initials: G
authors.lastname: Soto-Romero
authors.forename: William
authors.initials: W
authors.lastname: Bertucci
authors.forename: Frederic
authors.initials: F
authors.lastname: Grappe
mesh_terms: D001642:Bicycling / Q000502:physiology*; D004867:Equipment Design; D016552:Ergometry / Q000295:instrumentation*; D005080:Exercise Test / Q000295:instrumentation; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055815:Young Adult
keywords: cycling; field; laboratory; mobile power meter; power output