Heart rate variability (HRV) is a key biomarker of autonomic nervous system regulation and resilience to stress. Chronic stress typically leads to reduced HRV, reflecting sympathetic dominance and impaired vagal tone. Reiki has been shown in some pilot studies to increase HRV coherence by stimulating parasympathetic nervous system activity through intentional stillness, meditative breathing, and gentle touch or presence.
During a Reiki session, the recipient often enters a theta-dominant brainwave state, which parallels a meditative or deeply relaxed condition. This state can increase vagal activity, which in turn enhances HRV coherence. Studies using HRV biofeedback during or after Reiki show elevated coherence scores and reduced markers of physiological arousal, suggesting that Reiki may train the nervous system toward greater flexibility.
For individuals with chronic stress, this means greater resilience, improved recovery from triggers, and potentially reduced long-term risk for cardiovascular or immune dysfunction. HRV tracking before and after multiple Reiki sessions could become a valuable tool for evaluating session effectiveness. More clinical trials are needed, but current data suggest Reiki may be a non-invasive method for autonomic recalibration.