Differential atrophy of the postero-lateral hip musculature during prolonged bedrest and the influence of exercise countermeasures

Miokovic, Tanja, Armbrecht, Gabriele, Felsenberg, Dieter and Belavý, Daniel L. 2011, Differential atrophy of the postero-lateral hip musculature during prolonged bedrest and the influence of exercise countermeasures, Journal of applied physiology, vol. 110, no. 4, pp. 926-934, doi: 10.1152/japplphysiol.01105.2010.

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Title Differential atrophy of the postero-lateral hip musculature during prolonged bedrest and the influence of exercise countermeasures
Author(s) Miokovic, Tanja
Armbrecht, Gabriele
Felsenberg, Dieter
Belavý, Daniel L.ORCID iD for Belavý, Daniel L. orcid.org/0000-0002-9307-832X
Journal name Journal of applied physiology
Volume number 110
Issue number 4
Start page 926
End page 934
Total pages 9
Publisher American Physiological Society
Place of publication Bethesada, Md.
Publication date 2011-04
ISSN 1522-1601
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Sport Sciences
muscle atrophy
whole body vibration
Summary As part of the 2nd Berlin BedRest Study (BBR2-2), we investigated the pattern of muscle atrophy of the postero-lateral hip and hamstring musculature during prolonged inactivity and the effectiveness of two exercise countermeasures. Twenty-four male subjects underwent 60 days of head-down tilt bedrest and were assigned to an inactive control (CTR), resistive vibration exercise (RVE), or resistive exercise alone (RE) group. Magnetic resonance imaging (MRI) of the hip and thigh was taken before, during, and at end of bedrest. Volume of posterolateral hip and hamstring musculature was calculated, and the rate of muscle atrophy and the effect of countermeasure exercises were examined. After 60 days of bedrest, the CTR group showed differential rates of muscle volume loss (F = 21.44; P ≤ 0.0001) with fastest losses seen in the semi-membranosus, quadratus femoris and biceps femoris long head followed by the gluteal and remaining hamstring musculature. Whole body vibration did not appear to have an additional effect above resistive exercise in preserving muscle volume. RE and RVE prevented and/or reduced muscle atrophy of the gluteal, semi-membranosus, and biceps femoris long head muscles. Some muscle volumes in the countermeasure groups displayed faster recovery times than the CTR group. Differential atrophy occurred in the postero-lateral hip musculature following a prolonged period of unloading. Short-duration high-load resistive exercise during bedrest reduced muscle atrophy in the mono-articular hip extensors and selected hamstring muscles. Future countermeasure design should consider including isolated resistive hamstring curls to target this muscle group and reduce the potential for development of muscle imbalances.
Language eng
DOI 10.1152/japplphysiol.01105.2010
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
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071024

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