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SHR Neuro Krebs Kardio Lipid Stoffw Microb

Gao, YF; Wang, J; Wang, HP; Feng, B; Dang, K; Wang, Q; Hinghofer-Szalkay, HG.
Skeletal muscle is protected from disuse in hibernating dauria ground squirrels.
Comp Biochem Physiol A Mol Integr Physiol. 2012; 161(3):296-300 Doi: 10.1016/j.cbpa.2011.11.009
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Hinghofer-Szalkay Helmut

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The purpose of this study is to test the hypothesis that muscle fibers are protected from undue atrophy in hibernating dauria ground squirrels (Spermophilus dauricus, Brandt). Muscle mass, fiber cross sectional area (CSA, video analysis) and fiber type distribution (m-ATPase staining) were determined in extensor digitorum longus (EDL) muscle from non-hibernating control animals (Pre-H), from animals who hibernated for one (H1) or two (H2) months, and from animals 2-4days after arousal (Post-H; N=8 each). Muscle wet weight decreased less than body weight in hibernating animals, resulting in a steady increase in muscle-to-body mass ratio (+37% in Post-H compared to Pre-H, p<0.001). In the Pre-H group, Type I (6.3±2.0%) and II (93.7±2.0%) fiber CSAs were 1719±201 and 2261±287ìm(2), respectively. There was a tendency (n.s.) of larger CSA of type I in hibernators compared to pre-H. In the Post-H group, fiber CSA and type distribution were not different from Pre-H. We are the first to report data on EDL fiber type distribution and confirm a protective effect that prevents muscle atrophy in spite of prolonged disuse during hibernation in dauria ground squirrels. Copyright © 2011 Elsevier Inc. All rights reserved.
Find related publications in this database (using NLM MeSH Indexing)
Animals -
Body Weights and Measures -
Hibernation -
Muscle Fibers, Skeletal - metabolism
Muscle, Skeletal - anatomy and histology
Sciuridae - physiology

Find related publications in this database (Keywords)
Extensor digitorum longus
Fiber cross-sectional area
Fiber type composition
Myosin ATPase
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