title: Physiological Responses during Cycle Ergometry at a Constant Perception of Effort.
abstract: 13 subjects performed an incremental test to exhaustion, 4, 8-min submaximal rides, and a 1-h ride at the rating of perceived exertion (RPE) that corresponded to the physical working capacity at the OMNI threshold (PWC(OMNI)) to examine: 1) the oxygen consumption (V̇O2), heart rate (HR), minute ventilation (+V̇(E)), respiratory frequency (FR), and power output responses during 1-h work bouts at a constant RPE that corresponded to the PWC(OMNI); and 2) the ability of current models to explain the responses for physiological and perceptual parameters during the 1-h work bouts. The RPE that corresponded to the PWC(OMNI) represented a sustainable exercise intensity (56±5% (V̇O(2Peak)) within the moderate-intensity domain. The mean, normalized slope coefficients for the V̇O2, +V̇(E), and power output vs. time relationships during the 1-h rides were significantly less than zero. The mean, normalized slope coefficient for the FR vs. time relationship during the 1-h rides, however, was not significantly different from zero. Thus, RPE most clearly tracked FR responses during the 1-h rides. It was hypothesized that afferent feedback from respiratory muscles may have mediated the perception of effort during cycle ergometry at a constant RPE in the moderate-intensity domain.
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: K C
authors.initials: KC
authors.lastname: Cochrane
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: T J
authors.initials: TJ
authors.lastname: Housh
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: H C
authors.initials: HC
authors.lastname: Bergstrom
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: N D M
authors.initials: ND
authors.lastname: Jenkins
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: G
authors.initials: G
authors.lastname: Johnson
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: R J
authors.initials: RJ
authors.lastname: Schmidt
authors.affiliation: Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States.
authors.forename: J T
authors.initials: JT
authors.lastname: Cramer
mesh_terms: D001642:Bicycling / Q000502:physiology; D004734:Energy Metabolism; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D010465:Perception / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D056152:Respiratory Rate; D055815:Young Adult