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)
The more lean muscle mass you have, the more calories you burn. Muscle tissue burns more calories than fat tissue, and the more muscle you have, the more your metabolism increases. This means you burn more calories during activities as well as when you are at rest. If you have weight loss goals, a combination of cardio and strength training will up your metabolism, create more muscle mass and help you burn calories and fat.