As to which type of guitar capo will best suit your playing, you will need to match the capo to your guitar, the primary factor being whether you have a flat fretboard, like a nylon-stringed classical or some steel-string acoustics, or if the fretboard is curved, like on most steel-stringed acoustics and electrics.
However, note that other causes of the symptom 'Muscle mass loss' may be possible. Research the causes of these symptoms that are more broader types of symptom than Muscle mass loss: Muscle atrophy (351 causes)
jason millstein for npr as we age our muscle mass decreases at surprising rates according to dr david heber director of ucla s center for human nutrition an average male who weights 180 pounds might after age 60 lose as much as 10 pounds of muscle mass over a decade