Shoulder elevation with scapular rhythm under load

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1

Hi guys,

I’m working with version 4.0.2 and AMMR 1.0. I rencently implemented your scapular rhythm (deGroot, 2001). Now I do an elevation from 0 to 120 degrees with a 2 kg dumbell at the hand. The problem is that I get a muscle saturation from 90 degrees of thoracohumeral elevation and i don’t know why, because lifting a 2 kg dumbell should not be that hard. The model is the original one, with no change, except for the rhythm. Do you also get a saturation ?

Thank you

Pierre

2

Hi Pierre,

I just tried a load case similar to what you describe and the muscle activity reaches 1 but doesn’t go higher. So the model can still do it even if with a large effort. And lifting 2 kg with extended arm is actualy not so easy for an average person (i also just tried it myself).
So i think the results are resonable.

Best regards, Sylvain.

3

Hi Sylvain,

Ok so maybe my definition of muscles reaching their maximum activity is erroneous and is far more than just not being able to perform a task. I just wanted to be sure that the results that i get were correct.

Thank you very much.

Pierre