How good would any of you say EMG studies are at determining the "worth" or effectiveness of an exercise? I would be real interested in hearing some opinions on this. Obviously they're not as good as good ol' fashioned trial and error, though that can take years to objectively figure out which exercises benefit your lifts the most, seeing as how there are so many other variables (diet, sleep, supplements, everything else you're doing, etc.).
I'm referring to articles such as these --> http://www.tmuscle.com/free_online_a...ceps_exercises
and no I haven't read either in depth, just sort of glanced through them.