With your shoulder abducted to 60 degrees, you are holding a weight in your hand

Question

With your shoulder abducted to 60 degrees, you are holding a weight in your hand. Assuming the deltoid muscle converges to a single point on the deltoid tuberosity that is 0.09m from the joint centre, and pulls at an angle of 10 degrees away from the bone, what is the force of the deltoid muscle to maintain the isometric contraction?

Other necessary values are:

Mass of upper arm- 8kg

Mass of lower arm/hand- 5kg

Mass of weight- 10kg

Center of Mass of upper arm to center of shoulder- 0.20m,

COM of lower arm/hand to center of shoulder-0.35m

COM of weight to center of shoulder-0.45m.

Explanation / Answer

F = 40 N

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