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Previous studies have identified over 3, genes that are differentially expressed in male and female skeletal muscle. Here, we review the sex-based differences in skeletal muscle fiber composition, myosin heavy chain expression, contractile function, and the regulation of these physiological differences by thyroid hormone, estrogen, and testosterone. The findings presented lay the basis for the continued work needed to fully understand the skeletal muscle differences between males and females. Cardiac, smooth, and skeletal are the three muscle types in mammals, with skeletal muscle being the most abundant tissue in the human body. Skeletal muscles are composed of different types of fibers which diverge morphologically, biochemically, and functionally. Early studies describing muscle fiber-type composition and development did not address the potential for differences between species and sex. This is often the case in experimental models where sex is thought to confound results and therefore usually only males are studied.
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