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The original was posted on /r/musemeditation by /u/ambivilententhusiast on 2021-03-10 14:32:02+00:00.

“Meditation produced variable but characteristic EEG changes, significantly different from baseline, even among novice meditators on the first day. In addition, although participants were predominately normotensive, the mean arterial blood pressure fell a small (2-3 mmHg) but significant (p < 0.0001) amount during meditation. The effect of meditation on HRV was less clear and influenced by calculation technique and respiration. No clear relationship between EEG changes, HRV alterations, or mean blood pressure during meditation was found.”

Study on PubMed: Cardiovascular and nervous system changes during meditation