A new research examines different hormones and their effect on hypertrophy – muscle growth.
Some interesting questions from this research are:
Cortisol – usually associated with atrophy due it’s catabolic nature, seems to be actually associated with hypertrophy.
Exercise promoted GH (growth hormone) and Testosterone had nothing to do with hypertrophy gains or gains in strength. They associated with fat breaking though.
While steroids may be a different story, natural Testosterone levels have no impact on muscle hypertrophy – hence the myth associated with muscle gain and old age.
Read this interesting piece here: http://www.springerlink.com/content/228h54586751g19l/