This is some compelling new research... "A study led by researchers at the University of California, Berkeley, has identified critical biochemical pathways linked to the aging of human muscle. By manipulating these pathways, the researchers were able to turn back the clock on old human muscle, restoring its ability to repair and rebuild itself." http://www.bio-medicine.org/biology-news-1/Scientists-discover-clues-to-what-makes-human-muscle-age-10175-1/" [Broken] "The research also found evidence that aging muscles need to be kept in shape, because long periods of atrophy are more challenging to overcome." http://www.livescience.com/health/090930-aging-muscles.html" [Broken] This research was led by scientists at http://berkeley.edu/news/media/releases/2009/09/30_muscle.shtml" [Broken]. and recently published in the journal, http://www.embomolmed.org/details/j...rejuvenation_of_human_muscle_stem_cells.html"