| Does correction of exercise-induced desaturation by O(2) always improve exercise tolerance in COPD? A preliminary study. | |
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MedLine Citation:
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PMID: 18619828 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: This study sought to investigate whether correction of exercise-induced desaturation by oxygen supply (O(2)) systematically improves exercise tolerance and cardiorespiratory adaptations in COPD patients. METHODOLOGY: Twenty-five COPD patients [FEV(1)=52+/-2.5% pred] exhibiting exercise-induced desaturation performed cyclo-ergometer endurance exercise at 60%of their maximal workload in two randomized conditions: air vs. O(2). O(2) was adjusted to ensure 90 < or = SpO(2) < or = 95%. Endurance time (Tlim), dyspnoea, ventilation (V (E)), breathing frequency (fb), tidal volume (V(T)), cardiac output (CO), heart rate (HR) and arterio-venous difference in oxygen (AVD) were compared between conditions. RESULTS: The comparison of whole group performance between conditions revealed no differences, but individual analysis showed that O(2) increased Tlim for 14 patients [+68%; p<0.01; (positive responders)], decreased it for seven [-36%; p<0.05; (negative responders)] and induced no change for four (non-responders). For positive responders, improved performance was supported by reduced dyspnoea, V (E), fb, HR and CO and increased AVD. For negative responders, hyperoxia resulted in increased dyspnoea and fb without change in V (E) or cardiovascular parameters. CONCLUSION: For comparable correction of exercise desaturation, O(2) does not induce similar effects on exercise responses in all patients. These results were confirmed in complementary study with 11 consecutives patients at higher exercise intensity. For R+, we recorded the classic and expected O(2) effects on cardiorespiratory adaptations (i.e. reduced ventilatory demand and cardiac output). In the other group, exercise breathing frequency and dyspnoea were paradoxically increased despite desaturation correction. However, this study must be considered as pilot study, which will need to be confirmed in future studies conducted on a larger case series. |
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Authors:
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Nelly Héraud; Christian Préfaut; Fabienne Durand; Alain Varray |
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Publication Detail:
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Type: Comparative Study; Journal Article; Randomized Controlled Trial Date: 2008-07-10 |
Journal Detail:
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Title: Respiratory medicine Volume: 102 ISSN: 0954-6111 ISO Abbreviation: Respir Med Publication Date: 2008 Sep |
Date Detail:
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Created Date: 2008-08-04 Completed Date: 2009-08-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8908438 Medline TA: Respir Med Country: England |
Other Details:
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Languages: eng Pagination: 1276-86 Citation Subset: IM |
Affiliation:
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EA 2991, Laboratory of Motor Efficiency and Deficiency, University of Montpellier 1, 700 Av. du Pic Saint Loup, 34090 Montpellier, France. nelly.heraud@fontalvie.fr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Analysis of Variance Cardiac Volume Exercise Therapy / methods Exercise Tolerance* Female Heart Rate Humans Lung / physiopathology* Male Middle Aged Oxygen / blood, therapeutic use* Oxygen Consumption / physiology Pulmonary Disease, Chronic Obstructive / blood, physiopathology*, therapy Regression Analysis Respiratory Function Tests Stroke Volume |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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