{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360011143672392448.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1152/japplphysiol.01047.2009"}},{"identifier":{"@type":"URI","@value":"https://www.physiology.org/doi/pdf/10.1152/japplphysiol.01047.2009"}}],"dc:title":[{"@value":"Priming exercise speeds pulmonary O<sub>2</sub> uptake kinetics during supine “work-to-work” high-intensity cycle exercise"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p> We manipulated the baseline metabolic rate and body position to explore the effect of the interaction between recruitment of discrete sections of the muscle fiber pool and muscle O<jats:sub>2</jats:sub> delivery on pulmonary O<jats:sub>2</jats:sub> uptake (V̇o<jats:sub>2</jats:sub>) kinetics during cycle exercise. We hypothesized that phase II V̇o<jats:sub>2</jats:sub> kinetics (τ<jats:sub>p</jats:sub>) in the transition from moderate- to severe-intensity exercise would be significantly slower in the supine than upright position because of a compromise to muscle perfusion and that a priming bout of severe-intensity exercise would return τ<jats:sub>p</jats:sub> during supine exercise to τ<jats:sub>p</jats:sub> during upright exercise. Eight male subjects [35 ± 13 (SD) yr] completed a series of “step” transitions to severe-intensity cycle exercise from an “unloaded” (20-W) baseline and a baseline of moderate-intensity exercise in the supine and upright body positions. τ<jats:sub>p</jats:sub> was not significantly different between supine and upright exercise during transitions from a 20-W baseline to moderate- or severe-intensity exercise but was significantly greater during moderate- to severe-intensity exercise in the supine position (54 ± 19 vs. 38 ± 10 s, P < 0.05). Priming significantly reduced τ<jats:sub>p</jats:sub> during moderate- to severe-intensity supine exercise (34 ± 9 s), returning it to a value that was not significantly different from τ<jats:sub>p</jats:sub> in the upright position. This effect occurred in the absence of changes in estimated muscle fractional O<jats:sub>2</jats:sub> extraction (from the near-infrared spectroscopy-derived deoxygenated Hb concentration signal), such that the priming-induced facilitation of muscle blood flow matched increased O<jats:sub>2</jats:sub> utilization in the recruited fibers, resulting in a speeding of V̇o<jats:sub>2</jats:sub> kinetics. These findings suggest that, during supine cycling, priming speeds V̇o<jats:sub>2</jats:sub> kinetics by providing an increased driving pressure for O<jats:sub>2</jats:sub> diffusion in the higher-order (i.e., type II) fibers, which would be recruited in the transition from moderate- to severe-intensity exercise and are known to be especially sensitive to limitations in O<jats:sub>2</jats:sub> supply. </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380011143672392451","@type":"Researcher","foaf:name":[{"@value":"Fred J. DiMenna"}],"jpcoar:affiliationName":[{"@value":"School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Exeter, Devon; and"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143672392452","@type":"Researcher","foaf:name":[{"@value":"Daryl P. Wilkerson"}],"jpcoar:affiliationName":[{"@value":"School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Exeter, Devon; and"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143672392448","@type":"Researcher","foaf:name":[{"@value":"Mark Burnley"}],"jpcoar:affiliationName":[{"@value":"Department of Sport and Exercise Science, Aberystwyth University, Ceredigion, United Kingdom"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143672392450","@type":"Researcher","foaf:name":[{"@value":"Stephen J. Bailey"}],"jpcoar:affiliationName":[{"@value":"School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Exeter, Devon; and"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143672392449","@type":"Researcher","foaf:name":[{"@value":"Andrew M. Jones"}],"jpcoar:affiliationName":[{"@value":"School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Exeter, Devon; and"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"87507587"},{"@type":"EISSN","@value":"15221601"}],"prism:publicationName":[{"@value":"Journal of Applied Physiology"}],"dc:publisher":[{"@value":"American Physiological Society"}],"prism:publicationDate":"2010-02","prism:volume":"108","prism:number":"2","prism:startingPage":"283","prism:endingPage":"292"},"reviewed":"false","url":[{"@id":"https://www.physiology.org/doi/pdf/10.1152/japplphysiol.01047.2009"}],"createdAt":"2009-12-03","modifiedAt":"2019-09-08","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360009142542803584","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Impact of supine exercise on muscle deoxygenation kinetics heterogeneity: mechanistic insights into slow pulmonary oxygen uptake dynamics"}]},{"@id":"https://cir.nii.ac.jp/crid/1360853567471814144","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Impact of supine versus upright exercise on muscle deoxygenation heterogeneity during ramp incremental cycling is site specific"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204332592384","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Difference in Physiological Components of VO<sub>2 Max</sub> During          Incremental and Constant Exercise Protocols for the Cardiopulmonary Exercise          Test"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1152/japplphysiol.01047.2009"},{"@type":"CROSSREF","@value":"10.1152/japplphysiol.00213.2020_references_DOI_Duvmu60f2QoeIdv5CssvrVhRqEf"},{"@type":"CROSSREF","@value":"10.1589/jpts.26.1283_references_DOI_Duvmu60f2QoeIdv5CssvrVhRqEf"},{"@type":"CROSSREF","@value":"10.1007/s00421-021-04607-6_references_DOI_Duvmu60f2QoeIdv5CssvrVhRqEf"}]}