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)
Muscle mass is reduced as muscles atrophy with disuse. Muscle atrophy occurs by a change in the normal balance between protein synthesis and protein degradation. During atrophy, there is a down-regulation of protein synthesis pathways, and an activation of protein degradation.