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Heart rate and daily physical activity with long-duration habitation of the International Space Station.
MedLine Citation:
PMID:  22764612     Owner:  NLM     Status:  In-Process    
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.
Katelyn S Fraser; Danielle K Greaves; J Kevin Shoemaker; Andrew P Blaber; Richard L Hughson
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  83     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-07-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  577-84     Citation Subset:  IM; S    
Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
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