So I did some anatomy look ups on the lats, learned something.
Consider this: the attachment of the lat is on the
front of the upper arm bone, albeit very near the top. Therefore once the attachment point passes a certain point as the upper arm goes behind the body what was a muscular contraction creating a
pull does become a
push - it simply has to be. It is a unique muscle in that regard. But so are others in the hip that are both external and internal rotators depending on factors like femur angle. In this case its humerus angle relative to the T spine attachment starting point.
But because the attachment is so high on the arm bone, the point at which it is no longer a push is a tiny fraction of time at the beginning of the press. So I can see it that depending on "elbow depth" it is 100% within reason that the lats can actually aide in the push, albeit for a small fraction of time at the very beginning of the lift.
Personally I've felt my lats have a slight pump after bench. Definitely not every time nor even regularly, but I have. Was it explicitly only the bench or things done the previous workout? Shrug. I'm simply relating an anecdote of what *I* felt and I'm pretty sure you can find *a lot* of people saying the same thing.
FWIW I'm not defending an insistence on how important they are over any of the prime movers, merely stating what I see as an anatomical
possibility. EMG's are of course going to record barely anything because of how short of a period of time the lats actually would "push", if at all if the elbows were dropped enough. It would also seem that the degree of arch also would also play into how much lat can actually 'push' because it changes how far the elbow has to drop before the attachment drops below the attachment on the spine.
*technically it would still be a pull, not a push since it would be pulling the upper arm forward, but asdflaksfjalsdjkf
Last edited by nuclear500; 05-05-2017 at 12:15 PM.