When young guys quickly push or pull with their shoulders, different parts of key shoulder muscles turn on together in a smart way—and how they work together changes depending on the direction of the move.

21

Pro

0

Against

Evidence from Studies

Supporting (1)

21

Community contributions welcome

21

Muscles within muscles: Coordination of 19 muscle segments within three shoulder muscles during isometric motor tasks.

Cross-Sectional Study

Human

2007 Feb

The study looked at how different parts of shoulder muscles work together when young men quickly push in different directions, and found that the muscles coordinate in smart, flexible ways depending on the movement—just like the claim says.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Muscles within muscles: Coordination of 19 muscle segments within three shoulder muscles during isometric motor tasks.

Score: 21

DOI: 10.1016/j.jelekin.2005.10.007

Similar Assertions

Your shoulder muscles don’t work the same way every time — different parts of them take the lead or help out depending on which way you’re pushing or pulling, kind of like team members switching roles during different tasks.

21

0

82%

When young guys do certain shoulder exercises without moving their arms, their brain activates muscle units from different shoulder muscles together in specific teams, depending on the task — kind of like a coordinated crew, not just one muscle at a time.

21

0

79%

Different parts of big shoulder muscles actually work in their own unique ways because they pull with different strength and direction — kind of like how different sections of a fan blade might push air differently.

4

0

77%