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Message: [QUOTE="SVCBeercats, post: 2627171, member: 7874"] Are you expressing an opinion or referencing some study? A quick scan of studies appears to show studies having males with faster reaction times. Also studies show men have more quick twitch muscle fibers for power and speed. Women have more slow twitch muscle fibers and thus their endurance is superior. One study on the NCBI website says: "studies have identified over 3,000 genes that are differentially expressed in male and female skeletal muscle." Male muscle fibers contract faster than female muscle fibers. According to a 2004 study published in American Physiology Society, the skeletal muscles of men are faster and render higher maximum output compared to women’s skeletal muscles. Estrogen-B seems to have an effect in muscle contractile speed. [/QUOTE]