| Heart rate and daily physical activity with long-duration habitation of the International Space Station. | |
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MedLine Citation:
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PMID: 22764612 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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INTRODUCTION: We investigated the pattern of activity and heart rate (HR) during daily living on the International Space Station (ISS) compared to on Earth in 7 long-duration astronauts to test the hypotheses that the HR responses on the ISS would be similar to preflight values, although the pattern of activity would shift to a dominance of arm activity, and postflight HR would be elevated compared to preflight during similar levels of activity. METHODS: HR and ankle and wrist activity collected for 24-h periods before, during, and after spaceflight were divided into night, morning, afternoon, and evening segments. Exercise was excluded and analyzed separately. RESULTS: Consistent with the hypotheses, HR during daily activities on the ISS was unchanged compared to preflight; activity patterns shifted to predominantly arm in space. Contrary to the hypothesis, only night time HR was elevated postflight, although this was very small (+4 +/- 3 bpm compared to preflight). A trend was found for higher postflight HR in the afternoon (+10 +/- 10 bpm) while ankle activity level was not changed (99 +/- 48, 106 +/- 52 counts pre- to postflight, respectively). Astronauts engaged in aerobic exercise 4-8 times/week, 30-50 min/session, on a cycle ergometer and treadmill. Resistance exercise sessions were completed 4-6 times/week for 58 +/- 14 min/session. DISCUSSION: Astronauts on ISS maintained their HR during daily activities; on return to Earth there were only very small increases in HR, suggesting that cardiovascular fitness was maintained to meet the demands of normal daily activities. |
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Authors:
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Katelyn S Fraser; Danielle K Greaves; J Kevin Shoemaker; Andrew P Blaber; Richard L Hughson |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Aviation, space, and environmental medicine Volume: 83 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2012 Jun |
Date Detail:
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Created Date: 2012-07-05 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7501714 Medline TA: Aviat Space Environ Med Country: United States |
Other Details:
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Languages: eng Pagination: 577-84 Citation Subset: IM; S |
Affiliation:
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Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada. |
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Descriptor/Qualifier:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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