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DC Field | Value | Language |
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dc.contributor.author | Lovering, AT | - |
dc.contributor.author | Romer, LM | - |
dc.contributor.author | Haverkamp, HC | - |
dc.contributor.author | Pegelow, DF | - |
dc.contributor.author | Hokanson, JS | - |
dc.contributor.author | Eldridge, MW | - |
dc.date.accessioned | 2015-01-22T13:42:19Z | - |
dc.date.accessioned | 2015-02-05T13:10:30Z | - |
dc.date.available | 2008 | - |
dc.date.available | 2015-02-05T13:10:30Z | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | Journal of Applied Physiology, 104:5, pp. 1418 - 1425, 2008 | en_US |
dc.identifier.issn | 8750-7587 | - |
dc.identifier.uri | http://jap.physiology.org/content/104/5/1418 | - |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/10120 | - |
dc.description.abstract | Exercise-induced intrapulmonary arteriovenous shunting, as detected by saline contrast echocardiography, has been demonstrated in healthy humans. We have previously suggested that increases in both pulmonary pressures and blood flow associated with exercise are responsible for opening these intrapulmonary arteriovenous pathways. In the present study, we hypothesized that, although cardiac output and pulmonary pressures would be higher in hypoxia, the potent pulmonary vasoconstrictor effect of hypoxia would actually attenuate exercise-induced intrapulmonary shunting. Using saline contrast echocardiography, we examined nine healthy men during incremental (65W + 30 W/2 min) cycle exercise to exhaustion in normoxia and hypoxia (fraction of inspired O-2 = 0.12). Contrast injections were made into a peripheral vein at rest and during exercise and recovery (3-5 min postexercise) with pulmonary gas exchange measured simultaneously. At rest, no subject demonstrated intrapulmonary shunting in normoxia [ arterial P-O2 (Pa-O2) = 98 +/- 10 Torr], whereas in hypoxia (Pa-O2 = 47 +/- 5 Torr), intrapulmonary shunting developed in 3/9 subjects. During exercise, similar to 90% (8/9) of the subjects shunted during normoxia, whereas all subjects shunted during hypoxia. Four of the nine subjects shunted at a lower workload in hypoxia. Furthermore, all subjects continued to shunt at 3 min, and five subjects shunted at 5 min postexercise in hypoxia. Hypoxia has acute effects by inducing intrapulmonary arteriovenous shunt pathways at rest and during exercise and has longterm effects by maintaining patency of these vessels during recovery. Whether oxygen tension specifically regulates these novel pathways or opens them indirectly via effects on the conventional pulmonary vasculature remains unclear. | en_US |
dc.format.extent | 1418 - 1425 | - |
dc.format.extent | 1418 - 1425 | - |
dc.format.extent | 1418 - 1425 | - |
dc.language | EN | - |
dc.language.iso | en | en_US |
dc.relation.replaces | http://bura.brunel.ac.uk/handle/2438/9909 | - |
dc.relation.replaces | 2438/9909 | - |
dc.subject | alveolar-to-arterial oxygen tension difference | en_US |
dc.subject | contrast echocardiography | en_US |
dc.subject | pulmonary circulation | en_US |
dc.subject | exercise-induced arterial hypoxemia | en_US |
dc.subject | INDUCED ARTERIAL HYPOXEMIA | en_US |
dc.subject | CONTRAST ECHOCARDIOGRAPHY | en_US |
dc.subject | WHOLE BLOOD | en_US |
dc.subject | ARTERIOVENOUS-MALFORMATIONS | en_US |
dc.subject | HEMODYNAMIC-RESPONSE | en_US |
dc.subject | ULTRASONIC CONTRAST | en_US |
dc.subject | ALTITUDE | en_US |
dc.subject | BUBBLES | en_US |
dc.subject | LUNGS | en_US |
dc.subject | PLASMA | en_US |
dc.title | Intrapulmonary shunting and pulmonary gas exchange during normoxic and hypoxic exercise in healthy humans | en_US |
dc.type | Article | en_US |
dc.identifier.doi | http://dx.doi.org/10.1152/japplphysiol.00208.2007 | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
pubs.issue | 5 | - |
pubs.issue | 5 | - |
pubs.issue | 5 | - |
pubs.volume | 104 | - |
pubs.volume | 104 | - |
pubs.volume | 104 | - |
pubs.organisational-data | /Brunel | - |
pubs.organisational-data | /Brunel/Brunel Staff by College/Department/Division | - |
pubs.organisational-data | /Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences | - |
pubs.organisational-data | /Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences/Dept of Life Sciences | - |
pubs.organisational-data | /Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences/Dept of Life Sciences/Sport | - |
pubs.organisational-data | /Brunel/University Research Centres and Groups | - |
pubs.organisational-data | /Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups | - |
pubs.organisational-data | /Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Brunel Institute for Ageing Studies | - |
pubs.organisational-data | /Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Centre for Systems and Synthetic Biology | - |
Appears in Collections: | Sport Dept of Life Sciences Research Papers |
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