| Elevated baseline VO2 per se does not slow O2 uptake kinetics during work-to-work exercise transitions. | |
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MedLine Citation:
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PMID: 20724564 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We investigated whether the characteristic slowing of pulmonary oxygen uptake (VO2) kinetics during "work-to-work" exercise is attributable to elevations in baseline metabolic rate (VO2) as opposed to the elevated baseline work rate, per se. We hypothesized that a step transition to a higher work rate from "unloaded" cycling, but with elevations in VO2 [and heart rate (HR)] reflective of a work-to-work transition, would result in a lengthened phase II time constant (τ(p)). Seven male subjects (mean ± SD age 27 ± 10 yr) completed 1) transitions to a high-intensity work rate from a moderate-intensity work rate (M→H) and 2) two consecutive bouts of high-intensity exercise (U→H and E→H, respectively) initiated from unloaded cycling, with the time separating the exercise bouts chosen such that the baseline VO2 for the second transition was similar to the baseline VO2 for the M→H transition. The τ(p) for M→H (48 ± 16 s) was significantly greater (P < 0.05) than the τ(p) for U→H (28 ± 8 s) and E→H (27 ± 6 s), which did not differ significantly. These findings suggest that the altered VO2 dynamics that are observed during work-to-work exercise are not related to the elevated baseline VO2 (or HR) per se; rather, these effects appear to be linked to the elevated baseline work rate, which would be expected to dictate the subsequent muscle fiber recruitment profile. |
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Authors:
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Fred J DiMenna; Stephen J Bailey; Anni Vanhatalo; Weerapong Chidnok; Andrew M Jones |
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Publication Detail:
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Type: Journal Article Date: 2010-08-19 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 109 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1148-54 Citation Subset: IM |
Affiliation:
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School of Sport and Health Sciences, St. Luke's Campus, Univ. of Exeter, Heavitree Rd., Exeter, Devon EX1 2LU, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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