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- W2070882243 abstract "The first aim of this study was to examine the role of myofiber androgen receptor (AR) in male mice on muscle performance gain and remodeling-induced muscle mechanical overloading (OVL) that mimics resistance training. The response of OVL in mice in which AR is selectively ablated in myofibers (ARskm−/y) was compared with that of wild-type (WT) mice. In addition, we determined whether the synthetic anabolic androgen nandrolone administration affects the OVL response. We found that OVL increased absolute maximal force and fatigue resistance in both mouse genotypes (P < .05). However, the absolute maximal force increased more in ARskm−/y mice as compared with WT mice (+88% vs +63%) (P < .05). Muscle weight increased less in response to OVL in ARskm−/y mice (+54%) than in WT mice (+115%) (P < .05). The fiber number per cross-section similarly increased in both mouse genotypes after OVL (P < .05). In contrast to WT mice, the diameter of the fibers expressing myosin heavy chain (MHC)-2x decreased after OVL in ARskm−/y mice (P < .05). The MHC-2b to MHC-2a fiber type transition in response to OVL was reduced in ARskm−/y mice as compared with WT mice (P < .05). Finally, nandrolone administration during OVL did not further improve absolute maximal force and fatigue resistance and markedly alter muscle remodeling in both mouse genotypes. Together, our results indicate that myofiber AR is required for a complete response to OVL and that exogenous androgens do not increase muscle performance during intensive remodeling in male mice." @default.
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- W2070882243 date "2014-12-01" @default.
- W2070882243 modified "2023-10-16" @default.
- W2070882243 title "Myofiber Androgen Receptor Promotes Maximal Mechanical Overload-Induced Muscle Hypertrophy and Fiber Type Transition in Male Mice" @default.
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- W2070882243 doi "https://doi.org/10.1210/en.2014-1195" @default.
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