| Influence of body position and pre-exercise activity on cardiac output and oxygen uptake following step changes in exercise intensity. | |
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MedLine Citation:
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PMID: 1483437 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Parallel measurements of breath-by-breath oxygen uptake, cardiac output (Doppler technique), blood pressure (Finapres technique) and heart rate were performed in nine subjects during cycle ergometer exercise in the upright and supine positions. Transients were monitored during power steps starting from and leading to either rest or lower levels of exercise intensity. Oxygen uptake (VO2) and cardiac output kinetics were markedly faster than in all other conditions when exercise was started from rest. In contrast to exercise-exercise on steps, the computed arteriovenous difference in O2 content increased almost immediately in this situation, indicating that not only the additional energy expenditure due to the acceleration of the flywheel but also an increased venous admixture from non-exercising parts of the body contributed to the early kinetics. The off kinetics generally showed a more uniform pattern and did not simply mirror the on transients. The present findings indicate that transitions from rest should be avoided when muscle VO2 kinetics are to be assessed on the basis of VO2 measurements at the mouth. |
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Authors:
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D Leyk; D Essfeld; U Hoffmann; K Baum; J Stegemann |
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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: European journal of applied physiology and occupational physiology Volume: 65 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1992 |
Date Detail:
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Created Date: 1993-02-16 Completed Date: 1993-02-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY |
Other Details:
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Languages: eng Pagination: 499-506 Citation Subset: IM; S |
Affiliation:
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Physiologisches Institut der Deutschen Sporthochschule Köln, Federal Republic of Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Circulation / physiology Blood Pressure / physiology Cardiac Output / physiology* Exercise / physiology* Heart Rate / physiology Humans Male Oxygen / blood Oxygen Consumption / physiology* Posture / physiology* |
| 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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