title: Prediction of peak oxygen uptake from ratings of perceived exertion during a sub-maximal cardiopulmonary exercise test in patients with chronic obstructive pulmonary disease.
abstract: OBJECTIVE
  We assessed the validity of predicting peak oxygen uptake ([Formula: see text]O2 peak) from the relationship between oxygen uptake ([Formula: see text]O2) and overall ratings of perceived exertion (RPE) obtained during the initial stages of a cardiopulmonary exercise test (CPET).
  
  
  METHODS
  Fifteen healthy participants and 18 patients with chronic obstructive pulmonary disease (COPD) performed a maximal CPET, during which [Formula: see text]O2 and RPE were measured until RPE15.
  
  
  RESULTS
  Individual regressions between [Formula: see text]O2 and RPE ≤ 15 were extrapolated to RPE19 to predict [Formula: see text]O2 peak. Mean actual and predicted [Formula: see text]O2 peak were not significantly different in healthy women (18.9 ± 4.1 vs. 20.4 ± 4.5 mL kg(-1) min(-1), respectively) and men (28.9 ± 7.8 vs. 29.7 ± 8.5 mL kg(-1) min(-1), respectively), or in women (15.2 ± 4.7 vs. 15.8 ± 5.0 mL kg(-1) min(-1), respectively) and men (16.2 ± 4.4 vs. 17.4 ± 5.4 mL kg(-1) min(-1), respectively) with COPD (P = 0.067). Moreover, actual and predicted [Formula: see text]O2 peak were highly correlated in healthy participants and COPD patients (r ≥ 0.89; P < 0.001). The bias and 95 % limits of agreement were -1.0 ± 4.0 and -1.0 ± 4.6 mL kg(-1) min(-1) for healthy and COPD participants, respectively.
  
  
  CONCLUSIONS
  [Formula: see text]O2 peak can be predicted with acceptable accuracy in healthy participants and patients with COPD from the individual relationship between [Formula: see text]O2 and RPE ≤ 15.
authors.affiliation: Faculty of Sport Sciences, EA 3832, CETAPS, University of Rouen, Mont Saint Aignan, France, jeremy.coquart@voila.fr.
authors.forename: Jérémy B
authors.initials: JB
authors.lastname: Coquart
authors.forename: Roger G
authors.initials: RG
authors.lastname: Eston
authors.forename: Frédéric
authors.initials: F
authors.lastname: Lemaître
authors.forename: Frédéric
authors.initials: F
authors.lastname: Bart
authors.forename: Claire
authors.initials: C
authors.lastname: Tourny
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Grosbois
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005080:Exercise Test / Q000379:methods* / Q000592:standards; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010465:Perception; D005082:Physical Exertion; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D015203:Reproducibility of Results