| Human cardiorespiratory responses to acute cold exposure. | |
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MedLine Citation:
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PMID: 1149328 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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1. Respiratory and circulatory functions of minimally clad human subjects were studied before and during acute exposure to ambient temperatures of 4.5-6.5 degrees C. 2. After 1 h of cold exposure, subjects showed increases of ventilation, O2 UPTAKE AND CARDIAC OUTPUT. Rectal temperatures fell. 3. During exercise in the cold conditions, oxygen uptake and cardiac output were greater than during the same exercise at normal temperature. 4. The increased cardiac output during cold exposure was achieved by an increase of stroke volume rather than heart rate; this finding is in contrast to changes during bicycle exercise and isometric exercise at normal ambient temperatures. 5. We conclude that the cardiorespiratory effects of cold exposure are not superseded by the response to moderate exercise. The difference between heart rate and stroke volume at increased levels of cardiac output during exercise at normal temperatures and during rest and exercise in cold conditions may be explained by changes of arterial baroreceptor input and of blood catecholamine levels. |
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Authors:
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J N Hanna; P McN Hill; J D Sinclair |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Clinical and experimental pharmacology & physiology Volume: 2 ISSN: 0305-1870 ISO Abbreviation: Clin. Exp. Pharmacol. Physiol. Publication Date: 1975 May-Jun |
Date Detail:
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Created Date: 1975-11-06 Completed Date: 1975-11-06 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0425076 Medline TA: Clin Exp Pharmacol Physiol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 229-38 Citation Subset: IM; S |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Body Temperature Carbon Dioxide / metabolism Cardiac Output Cold Temperature* Heart Rate Hemodynamics* Humans Male Oxygen Consumption Physical Exertion Respiration* Temperature |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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