Western concept of meditation (mudra-holding sitting in a crowded room, wearing special yoga pants) has almost nothing to do with the original meaning, which was "let the mind stop by itself, become 100% idle, so the so called primordial awareness - life itself, which is prior to the language-based intellect, could be realized as one's own true nature", which uses breathing techniques, isolation from society, solitude (contrary to the narcissistically idiotic group settings), moderate austerities (the Buddha strongly emphasized futility of the extreme ones) and balanced body-mind complex in general.

All that cosplay, which almost screams at you - "I am yogin, look at me, I am meditator, look at me! I have this spiritual hairstyle and all the mystic tattoos", is so distant from the original meaning of the ancient practices, it is just ridiculous.

Study must be bad, because they obviously does not have any proper setting, like everything-else-being-equal, proper control groups, etc.

I could challenge any naive yoga-meditation zealot with assertion, that breath-holding divers, Nepalese porters (high altitude goods carriers) and marathon runners will exhibit similar but much better physiological reading, because the most important part is any yoga/meditation practices is regularity and restoring the original balance of the body/mind complex which is just proper homeostasis.

Rally, try these divers, porters and paraphon runners - they will put all the narcissistic yogins/meditators into shame.