| Overshoot phenomena of respiratory gas variables during exercise recovery in cardiac patients. | |
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MedLine Citation:
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PMID: 22322878 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Transient increases (overshoot) in respiratory gas variables have been observed during exercise recovery, but their clinical significance is not clearly understood. Our group evaluated the relationship between the presence of overshoot of respiratory gas variables and the parameters obtained from cardiopulmonary exercise testing (CPX). Methods and Results: In total, 227 patients with various cardiac diseases underwent CPX. The overshoot phenomena of O₂ uptake (·VO₂), ·VO₂/heart rate (O₂-pulse), and CO₂ output (·VCO₂) were analyzed by respiratory gas analysis during recovery after maximal exercise. The overshoot of ·VO₂, O₂-pulse, and ·VCO₂ were recognized in 11 (5%), 43 (19%), and 12 (5%) patients, respectively. Compared with the patients without a ·VO₂ overshoot, those with a ·VO₂ overshoot had a significantly lower peak ·VO₂ (12.3±3.7 vs. 17.9±6.2ml·min⁻¹·kg⁻¹, P=0.003), lower anaerobic threshold (9.4±1.7 vs. 12.4±3.3 ml·min⁻¹·kg⁻¹, P=0.001), higher ·VE-·VCO₂ slope (38.0±5.2 vs. 33.2±9.6, P=0.013), and lower left ventricular ejection fraction (LVEF) (39.9±22.8 vs. 55.8±16.8%, P=0.003). Similar findings were obtained for the patients with an O₂-pulse overshoot and those with a ·VCO₂ overshoot. CONCLUSIONS: The overshoot phenomena of respiratory gas variables during recovery after maximal exercise are correlated with impaired cardiopulmonary function during exercise in cardiac patients. |
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Authors:
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Takeya Suzuki; Akira Koike; Osamu Nagayama; Koji Sakurada; Hidekazu Tsuneoka; Jo Kato; Takeshi Yamashita; Junichi Yamazaki |
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Publication Detail:
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Type: Journal Article Date: 2012-02-09 |
Journal Detail:
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Title: Circulation journal : official journal of the Japanese Circulation Society Volume: 76 ISSN: 1347-4820 ISO Abbreviation: Circ. J. Publication Date: 2012 |
Date Detail:
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Created Date: 2012-03-27 Completed Date: 2012-06-25 Revised Date: 2013-05-20 |
Medline Journal Info:
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Nlm Unique ID: 101137683 Medline TA: Circ J Country: Japan |
Other Details:
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Languages: eng Pagination: 876-83 Citation Subset: IM |
Affiliation:
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Department of Cardiovascular Medicine, Toho University Omori Medical Center. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Anaerobic Threshold Blood Pressure Breath Tests Carbon Dioxide / metabolism* Exercise* Exercise Test Exercise Tolerance Female Heart Diseases / diagnosis, metabolism, physiopathology* Heart Rate Humans Japan Male Middle Aged Oxygen / metabolism* Oxygen Consumption* Recovery of Function Respiration* Stroke Volume Time Factors 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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