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1. Hibernation effects on muscle morphological characteristics and fiber type composition in dauria ground squirrels (Spermophilus dauricus | |||
GAO Yunfang,WANG Jun,WANG Huiping,FENG Ban,DANG Kai,WANG Qi,Helmut G. Hinghofer-Szalkay | |||
Biology 09 January 2011 | |||
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Abstract:Aim: We studied effects of hibernation on extensor digitorum longus (EDL) weight, fiber cross-sectional area (CSA), fiber type distribution, and myosin ATPase activity in dauria ground squirrels (Spermophilus dauricus). Methods: Muscle mass, fiber CSA (video analysis), fiber type, and myosin ATPase activity (Ca2+-ATPase) were measured before and after 1 and 2 months of hibernation, and 2-4 days after arousal in different groups of ground squirrels. Results: Compared with pre-hibernation, body weight decreased by about 10% per hibernation month and muscle wet weight was not altered. However, muscle-to-body weight ratio increased significantly. Both type I and type II fiber CSA increased by about 8% during hibernation, with no obvious influence of hibernation duration. Hibernation caused a slight but significant decrease in both ATPase activity and the percentage of type II fibers. 2-4 days after arousal, both fiber CSA and fiber type distribution returned to pre-hibernation levels. No type II fiber sub-type can be identified in dauria ground squirrel EDL samples. Conclusion: We report first data on EDL fiber type distribution and hibernation effects in dauria ground squirrels. EDL did not show any sign of atrophy over the 3-month winter dormancy. These results suggest that a potential mechanism exists in hibernators that would allow them to prevent muscle atrophy for the prolonged disuse. | |||
TO cite this article:GAO Yunfang,WANG Jun,WANG Huiping, et al. Hibernation effects on muscle morphological characteristics and fiber type composition in dauria ground squirrels (Spermophilus dauricus[OL].[ 9 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4401424 |
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