title: Influence of pedal cadence on the respiratory compensation point and its relation to critical power.
abstract: It is not known if the respiratory compensation point (RCP) is a distinct work rate (Watts (W)) or metabolic rate V̇(O2) and if the RCP is mechanistically related to critical power (CP). To examine these relationships, 10 collegiate men athletes performed cycling incremental and constant-power tests at 60 and 100 rpm to determine RCP and CP. RCP work rate was significantly (p≤0.05) lower for 100 than 60 rpm (197±24 W vs. 222±24 W), while RCP V̇(O2) was not significantly different (3.00±0.33 l min(-1) vs. 3.12±0.41 l min(-1)). CP at 60 rpm (214±51 W; V̇(O2): 3.01±0.69 l min(-1)) and 100 rpm (196±46 W; V̇(O2): 2.95±0.54 l min(-1)) were not significantly different from RCP. However, RCP and CP were not significantly correlated. These findings demonstrate that RCP represents a distinct metabolic rate, which can be achieved at different power outputs, but that RCP and CP are not equivalent parameters and should not, therefore, be used synonymously.
authors.affiliation: Department of Kinesiology, Kansas State University, Manhattan, KS, USA; Department of Anatomy and Physiology, Kansas State University, Manhattan, KS, USA. Electronic address: rbrox@ksu.edu.
authors.forename: R M
authors.initials: RM
authors.lastname: Broxterman
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Ade
authors.affiliation: Orthopedic Specialty Hospital, Murray, UT, USA.
authors.forename: T
authors.initials: T
authors.lastname: Barker
authors.affiliation: Department of Kinesiology, Kansas State University, Manhattan, KS, USA.
authors.forename: T J
authors.initials: TJ
authors.lastname: Barstow
mesh_terms: D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology*; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012044:Regression Analysis; D056152:Respiratory Rate / Q000502:physiology*; D012189:Retrospective Studies; D013997:Time Factors; D055815:Young Adult
keywords: Critical power; Oxygen uptake; Pedal cadence; Respiratory compensation point