| Effect of heart failure and physical training on the acute ventilatory response to hypoxia at rest and during exercise. | |
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MedLine Citation:
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PMID: 9097348 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied the acute ventilatory response to hypoxia (AHVR) in 10 patients with chronic heart failure (CHF) and in 10 subjects with normal left ventricular function (NLVF) before and after 8 weeks of home-based physical training. Subjects were studied at rest and during constant cycle exercise at a work rate equivalent to 40% of their maximum oxygen consumption. The AHVR was not significantly different between the patients with CHF and those with NLVF either at rest (1.32 +/- 0.19 vs. 1.63 +/- 0.20 litres/min/% arterial desaturation; mean +/- SE) or during constant light exercise (2.37 +/- 0.48 vs. 2.86 +/- 0.55 litres/min/% arterial desaturation). Both groups showed evidence of improved physical fitness after training with increases in maximum oxygen consumption of 11 +/- 2.7% (p < 0.01) for the group with NLVF and of 8 +/- 3.2% (p < 0.05) for the group with CHF. Values for the AHVR in the trained state were not significantly different between the patients with CHF and those with NLVF either at rest (1.23 +/- 0.24 vs. 1.63 +/- 0.22 litres/min/% arterial desaturation) or during constant light exercise (2.52 +/- 0.69 vs. 2.24 +/- 0.37 litres/min/% arterial desaturation). Moreover, these responses did not differ from those in the untrained state (see above). The AHVR increased during exercise compared with rest in both groups (p < 0.05). The AHVR is not substantially altered in patients with CHF compared to subjects with NLVF. Physical training may reduce ventilation during exercise, but it has relatively little or no effect on the AHVR. However, exercise increases the AHVR in patients with CHF, as it does in normals. |
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Authors:
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C W Barlow; M S Qayyum; P P Davey; D F Paterson; P A Robbins |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Respiration; international review of thoracic diseases Volume: 64 ISSN: 0025-7931 ISO Abbreviation: Respiration Publication Date: 1997 |
Date Detail:
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Created Date: 1997-06-11 Completed Date: 1997-06-11 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0137356 Medline TA: Respiration Country: SWITZERLAND |
Other Details:
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Languages: eng Pagination: 131-7 Citation Subset: IM; S |
Affiliation:
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University Laboratory of Physiology, University of Oxford, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anoxia
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complications,
physiopathology* Carbon Dioxide / blood Exercise Test* Exercise Therapy* Heart Failure / blood, complications, physiopathology* Humans Male Middle Aged Oxygen / blood Oxygen Consumption Physical Fitness Respiration* Ventricular Function, Left |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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