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- W2015769951 abstract "To better understand how atrophied muscles recover from prolonged nonweight-bearing, we studied soleus muscles (in vitro at optimal length) from female rats subjected to normal weight bearing (WB), 15 days of hindlimb unloading (HU), or 15 days HU followed by 9 days of weight bearing reloading (HU-R). HU reduced peak tetanic force (P o ), increased maximal shortening velocity (V max ), and lowered peak power/muscle volume. Nine days of reloading failed to improve P o , while depressing V max and intrinsic power below WB levels. These functional changes appeared intracellular in origin as HU-induced reductions in soleus mass, fiber cross-sectional area, and physiological cross-sectional area were partially or completely restored by reloading. We calculated that HU-induced reductions in soleus fiber length were of sufficient magnitude to overextend sarcomeres onto the descending limb of their length-tension relationship upon the resumption of WB activity. In conclusion, the force, shortening velocity, and power deficits observed after 9 days of reloading are consistent with contraction-induced damage to the soleus. HU-induced reductions in fiber length indicate that sarcomere hyperextension upon the resumption of weight-bearing activity may be an important mechanism underlying this response." @default.
- W2015769951 created "2016-06-24" @default.
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- W2015769951 date "2008-11-01" @default.
- W2015769951 modified "2023-10-18" @default.
- W2015769951 title "Detrimental effects of reloading recovery on force, shortening velocity, and power of soleus muscles from hindlimb-unloaded rats" @default.
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- W2015769951 doi "https://doi.org/10.1152/ajpregu.00045.2008" @default.
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