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

Buehring, Björn und Belavy, Daniel und Michaelis, Ingo und Gast, Ulf und Felsenberg, Dieter und Rittwger, Jörn (2011) Changes in lower extremity muscle function after 56 days of bed rest. Journal of Applied Physiology, 111, Seiten 87-94.

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Kurzfassung

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 musclefunction 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.

Dokumentart:Zeitschriftenbeitrag
Titel:Changes in lower extremity muscle function after 56 days of bed rest
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Buehring, BjörnCharité University Medicine Berlin
Belavy, DanielCharité University Medicine Berlin
Michaelis, IngoCharité University Medicine Berlin
Gast, UlfCharité University Medicine Berlin
Felsenberg, DieterCharité University Medicine Berlin
Rittwger, Jörnjoern.rittweger@dlr.de
Datum:2011
Erschienen in:Journal of Applied Physiology
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:111
Seitenbereich:Seiten 87-94
Status:veröffentlicht
Stichwörter:jump mechanography; muscle power; muscle force; E
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Beschleunigungsinduzierte Effekte (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Luft- und Raumfahrtmedizin > Weltraumphysiologie
Hinterlegt von: Jörn Rittweger
Hinterlegt am:09 Sep 2011 09:19
Letzte Änderung:12 Dez 2013 21:20

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