What, bizarrely, could be some connection, between gruesome experiments of chopping off frogs or salamanders limbs, and massage?
There may be some link, if slight, and dependent on personal beliefs, in these experiments by Robert Becker. He was an American orthopaedic surgeon and researcher in electrophysiology or electro-medicine. The ‘physiology’ part relates to ‘the physical, the body’. Hence, also see his book: ‘The Body Electric’.
He applied electrical charges to the sites of the amputated limbs of these animals. This in some cases caused the limbs to grow back over time, though many people find these experiments unethical, and Frankenstein-like. The aspect related to massage may be in the electrical currents generated.
It could be that minimal electrical charges are transmitted via massage and other touch treatments, or in other terms, ‘good vibes’ or ‘positivity’ of some sort. This may be two-way: masseur to client, and vice versa.