Yeah, but why muscle loss?

[elte]

My commentary: people lose muscle largely because their joints and tendons get too weak to withstand the forces of strong muscles.  Joints, including ligaments, are not nearly as resilient as muscles.  

http://medicalxpress.com/news/2015-11-mu...tures.html

[C C]

In addition to muscle wasting, it certainly doesn't help to have conditions like aortic stenosis and others that can decrease blood flow to the brain and cause semi-dizziness. Curiously, loss of linkage between nerves and muscle can contribute to muscle loss. Not something I even considered in the past as fading in the elderly like so many other bodily agencies.

[elte]

Indeed, weak nerve signaling to command muscle contraction is something that makes sense as being quite involved in muscle loss, yet can easily be missed as a factor.  I also didn't think of how low blood flow can lead to muscle wasting. It takes a lot of energy and nutrients to maintain muscle mass.