I did a lousy job of asking this in an earlier thread so let me try to keep it simple: Why train antagonistic muscles?
The major principle in EDT is to increase reps. OK, well, the most efficient way to do that is to focus on one exercise at a time . . . for example, 7 1/2 min of bench press followed by 7 1/2 min curls . . . instead of 15 min of alternating between the two.
I've spent the day researching this question on T-Nation and this is the best answer I can find:
" research has shown that you'll achieve better recuperation by performing a set for an antagonistic body part in-between sets. For instance, if you do a set of dumbbell bench presses, do a set for your lats in-between and then go back to your next set of dumbbell bench presses. You'll experience less of a drop in strength in between sets. No one is sure why, but you can bet it has to do with the neurological system. " (From the article A SIMPLETON'S GUIDE TO POLIQUIN PRINCIPLES I)
"Better recuperation?" . . . says who? . . . I haven't seen the research . . . all I know is that if you want to do the max number of reps on the bench press . . . plant your ass on the bench and press. If you want the max number of reps of curls, take your bar to a corner of the gym and do nothing but curls.
So why does EDT recommend alternating between exercises?
And again, my apologies for the confusing way I asked the question earlier.