Having larger and more type I fibers allows women to handle more volume than men. That’s not the only reason. In my article on the muscular potential of women, you’ve seen how having more of the female sex hormone estrogen gives women an advantage over men. Estrogen is an anti-catabolic hormone that aids in muscle repair, reduces protein break-down during exercise and protects you against muscle damage. This allows women to train with a higher training volume without becoming overtrained.