08/28/2021
Is your Infraspinatus working?
💪How the rotator cuff works during bench press💪 via
This is actually a really important concept for fitness and rehab professionals to learn. So we know that the job of the rotator cuff is to provide dynamic stability to the joint. When we move our shoulder around the rotator cuff has to fire to keep the ball centered in the socket.⠀
Well, it's no different in the bench press. However, how this works is interesting. We have some of this knowledge coming from EMG studies looking at a chest press (cited at the bottom of the image) which is very similar to the bench.
So in the chest press the prime movers are going to be the pecs and anterior delts at the shoulder. All of these muscles provide a strong ANTERIOR pull of the ball in the socket. Now, the rotator cuff on the back side of the of the joint (namesly infraspinatus) has to apply an equally strong POSTERIOR force to keep the ball centered in the socket.
Now, if you have a weak posterior cuff you might have excessive motion in the joint during pressing which could lead to problems. I think it's also potentially the reason why pressing tends to irritate cuff injuries (since infra/supra is the most common tendon to get injured and it works really hard during pressing).
So, you can make the argument that you're really training the cuff in the specific way it is challenged during strength training by just doing a bunch of pressing exercises. However, there's nothing wrong with directly training that posterior cuff with some sidelying external rotation! Oh, and the subscap is more active in pulling exercises as well.
What are your thoughts? I was happy to see a validation study like this in the literature to validate the concept. ⠀