title: Validity of Power Settings of the Wahoo KICKR Power Trainer.
abstract: OBJECTIVE
  To assess the validity of power output settings of the Wahoo KICKR Power Trainer (KICKR) using a dynamic calibration rig (CALRIG) over a range of power outputs and cadences.
  
  
  METHODS
  Using the KICKR to set power outputs, powers of 100-999 W were assessed at cadences (controlled by the CALRIG) of 80, 90, 100, 110, and 120 rpm.
  
  
  RESULTS
  The KICKR displayed accurate measurements of power of 250-700 W at cadences of 80-120 rpm with a bias of -1.1% (95% limits of agreement [LoA] -3.6% to 1.4%). A larger mean bias in power was observed across the full range of power tested, 100-999 W (4.2%, 95% LoA -20.1% to 28.6%), due to larger biases of 100-200 and 750-999 W (4.5%, 95% LoA -2.3% to 11.3%, and 13.0%, 95% LoA -24.4% to 50.3%), respectively.
  
  
  CONCLUSIONS
  Compared with a CALRIG, the KICKR has acceptable accuracy reporting a small mean bias and narrow LoA in the measurement of power output of 250-700 W at cadences of 80-120 rpm. Caution should be applied by coaches and sports scientists when using the KICKR at power outputs of <200 W and >750 W due to the greater variability in recorded power.
authors.forename: Emma K
authors.initials: EK
authors.lastname: Zadow
authors.forename: Cecilia M
authors.initials: CM
authors.lastname: Kitic
authors.forename: Sam S X
authors.initials: SS
authors.lastname: Wu
authors.forename: Stuart T
authors.initials: ST
authors.lastname: Smith
authors.forename: James W
authors.initials: JW
authors.lastname: Fell
mesh_terms: D054874:Athletic Performance; D001642:Bicycling; D002138:Calibration; D004867:Equipment Design; D016552:Ergometry / Q000295:instrumentation* / Q000592:standards; D005080:Exercise Test / Q000295:instrumentation* / Q000592:standards; D006801:Humans; D015203:Reproducibility of Results; D013647:Task Performance and Analysis; D013997:Time Factors
keywords: calibration; cycling; ergometry; training