title: Performance following prolonged sub-maximal cycling at optimal versus freely chosen pedal rate.
abstract: It was tested whether cyclists perform better during all-out cycling following prolonged cycling at the pedal rate resulting in minimum oxygen uptake (VO(2)), i.e. the energetically optimal pedal rate (OPR) rather than at the freely chosen pedal rate (FCPR). Nine trained cyclists cycled at 180 W to determine individual OPR and FCPR. Baseline performance was determined by measuring mean power output (W(5min)) and peak VO(2) during 5-min all-out cycling at FCPR. Subsequently, on two separate days, the cyclists cycled 2.5 h at 180 W at OPR and FCPR, with each bout followed by a 5-min all-out trial. FCPR was higher (P < 0.05) than OPR at 180 W (95 +/- 7 and 73 +/- 11 rpm, respectively). During the prolonged cycling, VO(2), heart rate (HR), and rate of perceived exertion (RPE) were 7-9% higher (P < 0.05) at FCPR than at OPR and increased (P < 0.05) 2-21% over time. During all-out cycling following prolonged cycling at OPR and FCPR, W(5min) was 8 and 10% lower (P < 0.05) than at baseline, respectively. Peak VO(2) was lower (P < 0.05) than at baseline only after FCPR. The all-out trial power output was reduced following 2.5 h of cycling at 180 W at both OPR and FCPR. However, this aspect of performance was similar between the two pedal rates, despite a higher physiological load (i.e. VO(2), HR, and RPE) at FCPR during prolonged cycling. Still, a reduced peak VO(2) only occurred after cycling at FCPR. Therefore, during prolonged sub-maximal cycling, OPR is at least as advantageous as FCPR for performance optimization in subsequent all-out cycling.
authors.affiliation: Department of Physical Performance, Norwegian School of Sport Sciences, Ullevål Stadion, 0806, Oslo, Norway. Ernst.albin.hansen@nih.no
authors.forename: Ernst A
authors.initials: EA
authors.lastname: Hansen
authors.forename: Kurt
authors.initials: K
authors.lastname: Jensen
authors.forename: Preben K
authors.initials: PK
authors.lastname: Pedersen
mesh_terms: D000328:Adult; D001642:Bicycling; D005080:Exercise Test / Q000379:methods; D006003:Glycogen / Q000493:pharmacokinetics*; D006801:Humans; D010101:Oxygen Consumption / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*
chemical_list: D006003:Glycogen