We investigated whether pedal cadence (60 vs. 100 rpm) affects oxygen uptake ((center dot) VO2) and power output (PO) at two indexes of the heavy-to-severe-intensity domain boundary (i.e., critical power (CP) and respiratory compensation point (RCP)) and their correspondence. Fourteen adults (7 females, 23 +/- 2 years) cycled at 60 and 100 rpm during: (i) a "step-ramp-step" protocol to identify (center dot) VO2 and PO at RCP; (ii) 4-5 exhaustive constant-PO bouts for CP identification; and (iii) a constant-power bout at CP to identify (VO2)-V-center dot at CP. Separate two-way repeated measures Analysis of variance assessed whether (center dot) VO2 and PO were affected by index (CP vs. RCP) and cadence (60 vs. 100 rpm). The (center dot) VO(2 )was not affected by index (mean difference (MD) = 73 +/- 197 mL min (- 1) ; p = 0.136) but there was an index x cadence interaction (p = 0.014), such that (center dot) VO2 was higher at 100 versus 60 rpm for CP (MD = 142 +/- 169 mL min (- 1) ; p = 0.008), but not RCP (p = 0526). The PO was affected by cadence (MD = 13 +/- 9 W; p < 0.001) and index (MD = 8 +/- 11 W; p = 0.016), with no cadence x index interaction (p = 0.168). The systematic bias in PO confirms cadence-specificity of CP and RCP. The relationship between these indexes and their change in unison in PO suggests a mechanistic link between these two heavy-to-severe domain boundary candidates.

A comparison of critical power and the respiratory compensation point at slower and faster pedaling cadences

Micheli, Lorenzo;Ferri Marini, Carlo;Lucertini, Francesco;
2024

Abstract

We investigated whether pedal cadence (60 vs. 100 rpm) affects oxygen uptake ((center dot) VO2) and power output (PO) at two indexes of the heavy-to-severe-intensity domain boundary (i.e., critical power (CP) and respiratory compensation point (RCP)) and their correspondence. Fourteen adults (7 females, 23 +/- 2 years) cycled at 60 and 100 rpm during: (i) a "step-ramp-step" protocol to identify (center dot) VO2 and PO at RCP; (ii) 4-5 exhaustive constant-PO bouts for CP identification; and (iii) a constant-power bout at CP to identify (VO2)-V-center dot at CP. Separate two-way repeated measures Analysis of variance assessed whether (center dot) VO2 and PO were affected by index (CP vs. RCP) and cadence (60 vs. 100 rpm). The (center dot) VO(2 )was not affected by index (mean difference (MD) = 73 +/- 197 mL min (- 1) ; p = 0.136) but there was an index x cadence interaction (p = 0.014), such that (center dot) VO2 was higher at 100 versus 60 rpm for CP (MD = 142 +/- 169 mL min (- 1) ; p = 0.008), but not RCP (p = 0526). The PO was affected by cadence (MD = 13 +/- 9 W; p < 0.001) and index (MD = 8 +/- 11 W; p = 0.016), with no cadence x index interaction (p = 0.168). The systematic bias in PO confirms cadence-specificity of CP and RCP. The relationship between these indexes and their change in unison in PO suggests a mechanistic link between these two heavy-to-severe domain boundary candidates.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2746011
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