title: Responses during exhaustive exercise at critical power determined from the 3-min all-out test.
abstract: The purpose of the present study was to examine oxygen consumption rate ([Vdot][Formula: see text]), heart rate (HR), and ratings of perceived exertion (RPE) responses, as well as time to exhaustion (Tlim) values during continuous rides at critical power (CP) determined from the 3-min all-out test. Eighteen participants (mean ± s: 23.6 ± 3.5 years; 72.7 ± 18.2 kg) performed an incremental cycle ergometer test to exhaustion to determine peak oxygen consumption rate ([Vdot][Formula: see text] peak) and HR peak. Critical power was determined from the 3-min all-out test. Metabolic responses ([Vdot][Formula: see text] and heart rate), RPE, and Tlim were recorded during continuous rides to exhaustion at CP. Linear regression and t-tests were used to compare [Vdot][Formula: see text], heart rate, and RPE responses during the continuous rides to exhaustion. The Tlim at CP was 12.5 ± 6.5 min. There were significant increases in [Vdot][Formula: see text], HR, and RPE during the continuous rides at CP and 15 of the 18 participants reached [Vdot][Formula: see text] peak at exhaustion. Therefore, the [Vdot][Formula: see text], heart rate, and RPE responses, as well as the Tlim values in the present study suggested that CP determined from the 3-min all-out test overestimated the "true" CP and was within the severe exercise intensity domain.
authors.affiliation: Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, 110 Ruth Leverton Hall, Lincoln 68583-0806, USA. hbergstrom@unlserve.unl.edu
authors.forename: Haley C
authors.initials: HC
authors.lastname: Bergstrom
authors.forename: Terry J
authors.initials: TJ
authors.lastname: Housh
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Zuniga
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Traylor
authors.forename: Robert W
authors.initials: RW
authors.lastname: Lewis
authors.forename: Clayton L
authors.initials: CL
authors.lastname: Camic
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Schmidt
authors.forename: Glen O
authors.initials: GO
authors.lastname: Johnson
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005221:Fatigue / Q000209:etiology*; D005260:Female; D006339:Heart Rate; D006801:Humans; D016014:Linear Models; D008297:Male; D010101:Oxygen Consumption; D010465:Perception; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D055815:Young Adult