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Effects of 17-day spaceflight on knee extensor muscle function and size.: European journal of applied physiology
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
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2005 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 93, no 4, 463-468 p.Article in journal (Refereed) Published
Abstract [en]

It is generally held that space travelers experience muscle dysfunction and atrophy during exposure to microgravity. However, observations are scarce and reports somewhat inconsistent with regard to the time course, specificity and magnitude of such changes. Hence, we examined four male astronauts (group mean 43 years, 86 kg and 183 cm) before and after a 17-day spaceflight (Space Transport System-78). Knee extensor muscle function was measured during maximal bilateral voluntary isometric and iso-inertial concentric, and eccentric actions. Cross-sectional area (CSA) of the knee extensor and flexor, and gluteal muscle groups was assessed by means of magnetic resonance imaging. The decrease in strength (P<0.05) across different muscle actions after spaceflight amounted to 10%. Eight ambulatory men, examined on two occasions 20 days apart, showed unchanged (P>0.05) muscle strength. CSA of the knee extensor and gluteal muscles, each decreased (P<0.05) by 8%. Knee flexor muscle CSA showed no significant (P>0.05) change. The magnitude of these changes concord with earlier results from ground-based studies of similar duration. The results of this study, however, do contrast with the findings of no decrease in maximal voluntary ankle plantar flexor force previously reported in the same crew.

Place, publisher, year, edition, pages
2005. Vol. 93, no 4, 463-468 p.
Keyword [en]
muscle atrophy, muscle strength, STS78
Keyword [sv]
Idrottsvetenskap
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-610DOI: 10.1007/s00421-004-1236-9ISI: 000225911900012Local ID: 5929OAI: oai:DiVA.org:miun-610DiVA: diva2:25641
Available from: 2008-09-30 Created: 2009-06-07 Last updated: 2011-07-06Bibliographically approved

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Tesch, Per A
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf