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)
So, what is muscle atrophy and what can be done to reverse it? Muscle atrophy is the loss or decrease of muscle mass. The synonyms for it are muscle wasting, muscle loss, muscle catabolism, muscle withering. The cause of muscle atrophy are a lack of use of the muscle or a disruption of the nerve signals to the muscle. It is seen in many conditions, especially with cachexia in cancer and HIV/AIDS. The cure for muscle atrophy is using the muscle, most easily through exercise and being active in normal daily activities.