| Comparing the effects of two in-flight aerobic exercise protocols on standing heart rates and VO(2peak) before and after space flight. | |
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MedLine Citation:
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PMID: 8083389 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of regular aerobic exercise on orthostatic tolerance have been the subject of a long-standing controversy that will influence the use of exercise during space flight. To examine these effects, astronauts performed continuous (CE) aerobic exercise (n = 8), interval (IE) aerobic exercise (n = 4), or no (NE) exercise (n = 5) during flights of 7 to 11 days. Heart rate (HR) responses to an orthostatic challenge (stand test) were measured 10 days before flight and on landing day. VO(2peak) (graded treadmill exercise) was measured 7 to 21 days before and 2 days after flight. No significant differences across the groups were observed in standing HRs before or after flight. However, the within-group mean HRs significantly increased in the NE (71-89 beats/min) and CE (60-85 beats/min) groups after space flight. The HRs for the IE group did not significantly increase (75-86 beats/min) after space flight. VO(2peak) decreased (P < .05) in the NE (-9.5%) group, but did not change in the CE (-2.4%) and IE (1%) groups. The relationship (r = 0.237) between the delta HR and delta VO(2peak) was not significant. These preliminary results indicate that: (1) continuous exercise does not affect the orthostatic HR response after space flight; (2) interval exercise may minimize an increase in the postflight orthostatic HR; and (3) both exercise protocols can maintain VO(2peak). |
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Authors:
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S F Siconolfi; J B Charles; A D Moore; L H Barrows |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of clinical pharmacology Volume: 34 ISSN: 0091-2700 ISO Abbreviation: J Clin Pharmacol Publication Date: 1994 Jun |
Date Detail:
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Created Date: 1994-10-13 Completed Date: 1994-10-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0366372 Medline TA: J Clin Pharmacol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 590-5 Citation Subset: IM; S |
Affiliation:
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Space Biomedical Research Institute, NASA Johnson Space Center, Houston, Texas. |
Space Flight Mission:
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Flight Experiment; STS Shuttle Project; manned; short duration |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Electrocardiography Exercise* Female Heart Rate / physiology* Hematocrit Humans Hypotension, Orthostatic / physiopathology, prevention & control Male Oxygen Consumption / physiology* Physical Education and Training* Space Flight* |
| Investigator | |
Investigator/Affiliation:
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J B Charles / JSC; S F Siconolfi / JSC |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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