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dc.contributor.authorCross, Troy J
dc.contributor.authorSabapathy, Surendran
dc.contributor.authorSchneider, Donald A
dc.contributor.authorHaseler, Luke J
dc.contributor.editorDavid Paterson
dc.date.accessioned2017-05-03T13:17:41Z
dc.date.available2017-05-03T13:17:41Z
dc.date.issued2010
dc.date.modified2011-06-07T06:57:17Z
dc.identifier.issn0958-0670
dc.identifier.doi10.1113/expphysiol.2009.048975
dc.identifier.urihttp://hdl.handle.net/10072/34056
dc.description.abstractThe contribution of respiratory muscle O2 uptake ((.)V(O2RM)) to the development of the slow component of O2 uptake kinetics ((.)V(O2SC)) is unclear. The aim of the present study was to examine the impact of respiratory muscle unloading (via breathing, a He-O2 mixture) on the amplitude of (.)V(O2SC) during exercise performed below (B-RCT) and above the respiratory compensation threshold (A-RCT). We hypothesized that breathing He-O2 would reduce the amplitude of the (.)V(O2SC) by a greater amount during exercise performed A-RCT than B-RCT. Eight healthy male recreational cyclists performed constant load cycling in four sets of conditions: (1) B-RCT breathing normal air; (2) B-RCT breathing He-O2; (3) A-RCT breathing normal air; and (4) A-RCT breathing He-O2. Breathing He-O2 did not significantly attenuate the (.)V(O2SC) during exercise performed B-RCT (-3+/-14%, P >0.05). However, breathing He-O2 significantly reduced the (.)V(O2SC) during exercise A-RCT(-45+/-6%, P <0.05). The attenuated (.)V(O2SC) while breathing He-O2 is likely to reflect a decreased (.)V(O2RM). Minute ventilation was not +/-different between normal air and He-O2 breathing trials either B-RCT or A-RCT. However, operating lung volume was significantly lower when breathing He-O2 during exercise performed A-RCT (-12+/-3%, P <0.05). These findings suggest that (.)V(O2RM) comprises a greater proportion of the (.)V(O2SC) when exercise is performed A-RCT compared with B-RCT. Therefore, the impact of breathing He-O2 was more pronounced during exercise A-RCT. Furthermore, changes in operating lung volume and the work of breathing appear to play an important role in the development of the (.)V(O2SC).
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherWiley-Blackwell Publishing
dc.publisher.placeUnited Kingdom
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom172
dc.relation.ispartofpageto183
dc.relation.ispartofissue1
dc.relation.ispartofjournalExperimental Physiology
dc.relation.ispartofvolume95
dc.rights.retentionN
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchSports science and exercise
dc.subject.fieldofresearchExercise physiology
dc.subject.fieldofresearchMedical physiology
dc.subject.fieldofresearchcode3109
dc.subject.fieldofresearchcode4207
dc.subject.fieldofresearchcode420702
dc.subject.fieldofresearchcode3208
dc.titleBreathing HeO2 attenuates the amplitude of the slow component of O2 uptake kinetics during exercise performed above the respiratory compensation threshold
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2010
gro.hasfulltextNo Full Text
gro.griffith.authorSabapathy, Surendran


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