title: Effect of the slow-component rise in oxygen uptake on VO2max.
abstract: During constant-rate high-intensity (CRHI) exercise lasting longer than 3 min, VO2 has been reported to exceed VO2max measured with a traditional graded exercise test (GXT). This could be because VO2max was not achieved on the GXT or because the factors responsible for the slow-component rise in VO2 alter VO2max. The objective of this study was to test the hypothesis that the slow-component rise in VO2 measured during CRHI running leads to a total VO2 that exceeds VO2max measured during a running GXT. VO2max was determined in eight highly trained individuals using data collected from five grade-incremented, treadmill-running GXT. Each subject demonstrated a definitive plateau of VO2 as a function of exercise intensity. Three VO2max values based on different approaches for representing the VO2max plateau were obtained. Subjects also completed two exhaustive CRHI bouts of treadmill running lasting 7-13 min at speeds estimated from the ACSM equation to elicit an average of 99 +/- 5% VO2max. The mean (+/- SD) VO2peak determined during the CRHI runs (4.17 +/- 0.9 l.min-1) was not different form or less than the three VO2max values (4.19-4.32 +/- 0.09 l.min-1). We conclude that in highly trained individuals, the slow-component rise in VO2 during CRHI treadmill running does not lead to a total VO2 that exceeds the VO2max measured during a running graded exercise test.
authors.affiliation: Department of Exercise Science, University of Georgia, Athens 30602-3654, USA. sloniger@uga.cc.uga.edu
authors.forename: M A
authors.initials: MA
authors.lastname: Sloniger
authors.forename: K J
authors.initials: KJ
authors.lastname: Cureton
authors.forename: D I
authors.initials: DI
authors.lastname: Carrasco
authors.forename: B M
authors.initials: BM
authors.lastname: Prior
authors.forename: D A
authors.initials: DA
authors.lastname: Rowe
authors.forename: R W
authors.initials: RW
authors.lastname: Thompson
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D012420:Running / Q000502:physiology*