@dchris thanks for the link. That was an interesting read. Working the target muscle with lighter weights first seems like a decent idea. Getting it burning before the big lift could help get focused on the target muscle. Probably not good for gains but as a training tool I can see the benefit.
I have recently started using just dumbbells for chest and not locking my elbows at the top. I get tired sooner but if the idea is constant tension then I guess that is supposed to happen.