title: The effect of the oxygen uptake-power output relationship on the prediction of supramaximal oxygen demands.
abstract: BACKGROUND
  The aim of this study was to investigate the relationship between oxygen uptake (V̇O2) and power output at intensities below and above the lactate threshold (LT) in cyclists; and to determine the reliability of supramaximal power outputs linearly projected from these relationships.
  
  
  METHODS
  Nine male cyclists (mean±standard deviation age: 41±8 years; mass: 77±6 kg, height: 1.79±0.05 m and V̇O2max: 54±7 mL∙kg-1∙min-1) completed two cycling trials each consisting of a step test (10×3 min stages at submaximal incremental intensities) followed by a maximal test to exhaustion. The lines of best fit for V̇O2 and power output were determined for: the entire step test; stages below and above the LT, and from rolling clusters of five consecutive stages. Lines were projected to determine a power output predicted to elicit 110% peak V̇O2.
  
  
  RESULTS
  There were strong linear correlations (r≥0.953; P<0.01) between V̇O2 and power output using the three approaches; with the slope, intercept, and projected values of these lines unaffected (P≥0.05) by intensity. The coefficient of variation of the predicted power output at 110% V̇O2max was 6.7% when using all ten submaximal stages.
  
  
  CONCLUSIONS
  Cyclists exhibit a linear V̇O2 and power output relationship when determined using 3 min stages, which allows for prediction of a supramaximal intensity with acceptable reliability.
authors.affiliation: School of Sport, Health and Applied Science, St Mary's University, Twickenham, UK - d.muniz@herts.ac.uk.
authors.forename: Daniel
authors.initials: D
authors.lastname: Muniz-Pumares
authors.affiliation: School of Sport, Health and Applied Science, St Mary's University, Twickenham, UK.
authors.forename: Charles
authors.initials: C
authors.lastname: Pedlar
authors.affiliation: The Centre for Sports Med and Human Performance, Brunel University, Uxbridge, UK.
authors.forename: Richard
authors.initials: R
authors.lastname: Godfrey
authors.affiliation: School of Sport, Health and Applied Science, St Mary's University, Twickenham, UK.
authors.forename: Mark
authors.initials: M
authors.lastname: Glaister
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D015203:Reproducibility of Results
chemical_list: D019344:Lactic Acid; D010100:Oxygen