Article: BOULDER SHOULDERS WORKOUT

Seriously, he states that the posterior deltoid's main function is extension, and then he post up an exercise that is horizontal abduction of the shoulder!
 
NattyForLife said:
Seriously, he states that the posterior deltoid's main function is extension, and then he post up an exercise that is horizontal abduction of the shoulder!
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well technically posterior deltoid does transverse extension and extension... tho it also does transverse abduction (reverse flye's etc..) and lateral rotation.. extension isnt posterior delts main function.. its just helping there minimally while latissimus dorsi, teres major etc do most of the work. Also for lateral rotation its not its main function. Rotator cuff muscle group handles majority of that. again posterior delt is just synergist there.

Could say transverse extension and transverse abduction are its "main" functions aka lateral movement away from the midline of the body in a horizontal plane. either moving the upper arm away from the chest with the elbows facing down or moving the upper arm away from the chest with the elbows out to the sides.

Good examples of transverse abduction would be reverse flyes while for transverse extension would be facepull.
extension happens abit when you do straight arm pulldowns.
 
Jikidi said:
well technically posterior deltoid does transverse extension and extension... tho it also does transverse abduction (reverse flye's etc..) and lateral rotation.. extension isnt posterior delts main function.. its just helping there minimally while latissimus dorsi, teres major etc do most of the work. Also for lateral rotation its not its main function. Rotator cuff muscle group handles majority of that. again posterior delt is just synergist there. Could say transverse extension and transverse abduction are its "main" functions aka lateral movement away from the midline of the body in a horizontal plane. either moving the upper arm away from the chest with the elbows facing down or moving the upper arm away from the chest with the elbows out to the sides. Good examples of transverse abduction would be reverse flyes while for transverse extension would be facepull. extension happens abit when you do straight arm pulldowns.
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The main action of the posterior delt is horizontal abduction.
 
yes. Thats why i said in my reply that transverse abduction and transverse extension are its main functions.
Horizontal abduction of humerus in shoulder girdle happens in transverse plane aka its part of transverse abduction. just more spesific.
I even gave examples and what that transverse abduction means = movement in horizontal plane.

posterior delt does extension too. it also helps on external/lateral rotation. Also what this article didint say is that posterior delt also does abduction of humerus.

Anyways no point to argue since we said same thing anyways and we both agree that it does horizontal abduction. I just happened to use diffirent word for it but clearly said the meaning of it(horizontal plane movement) and gave examples. Mine was just more spesific how that horizontal abduction happens.
 
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