
Originally Posted by
Narkissos
Wrong and Right.
Standing more effectively works the entire deltoid complex( ...and parts of the trapezial complex) due to the fact that one has to balance the weight. Thus making the standing barbell press a more effective core strength movement.
Are you using a bench with a back rest when you're in the seated position?
If so..that'd explain why you'd be able to press more...as the balancing factor will've been elimimated...
I'd hypothesize..that if you were using a bench with no back support (i.e. a flat bench), you'd actually be able to press LESS weight than if you were doing a standing press...as you would have to stabilise the weight AND would be pressing without the leverage provided by your legs in the standing movement.
~Narkissos