Changes in lower extremity muscle function after 56 days of bed rest

Buehring, B., Belavý, D.L., Michaelis, I., Gast, U., Felsenberg, D. and Rittweger, J. 2011, Changes in lower extremity muscle function after 56 days of bed rest, Journal of applied physiology, vol. 111, no. 1, pp. 87-94, doi: 10.1152/japplphysiol.01294.2010.

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Title Changes in lower extremity muscle function after 56 days of bed rest
Author(s) Buehring, B.
Belavý, D.L.ORCID iD for Belavý, D.L.
Michaelis, I.
Gast, U.
Felsenberg, D.
Rittweger, J.
Journal name Journal of applied physiology
Volume number 111
Issue number 1
Start page 87
End page 94
Total pages 8
Publisher American Physiological Society
Place of publication Bethesada, Md.
Publication date 2011-07
ISSN 1522-1601
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Sport Sciences
jump mechanography
muscle power
muscle force
Summary Preservation of muscle function, known to decline in microgravity and simulation (bed rest), is important for successful spaceflight missions. Hence, there is great interest in developing interventions to prevent muscle-function loss. In this study, 20 males underwent 56 days of bed rest. Ten volunteers were randomized to do resistive vibration exercise (RVE). The other 10 served as controls. RVE consisted of muscle contractions against resistance and concurrent whole-body vibration. Main outcome parameters were maximal isometric plantar-flexion force (IPFF), electromyography (EMG)/force ratio, as well as jumping power and height. Measurements were obtained before and after bed rest, including a morning and evening assessment on the first day of recovery from bed rest. IPFF (-17.1%), jumping peak power (-24.1%), and height (-28.5%) declined (P < 0.05) in the control group. There was a trend to EMG/force ratio decrease (-20%; P = 0.051). RVE preserved IPFF and mitigated the decline of countermovement jump performance (peak power -12.2%; height -14.2%). In both groups, IPFF was reduced between the two measurements of the first day of reambulation. This study indicates that bed rest and countermeasure exercises differentially affect the various functions of skeletal muscle. Moreover, the time course during recovery needs to be considered more thoroughly in future studies, as IPFF declined not only with bed rest but also within the first day of reambulation. RVE was effective in maintaining IPFF but only mitigated the decline in jumping performance. More research is needed to develop countermeasures that maintain muscle strength as well as other muscle functions including power.
Language eng
DOI 10.1152/japplphysiol.01294.2010
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920299 Health and Support Services not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, American Physiological Society
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