Cardiovascular and respiratory system
Heart-brain axis
Xue, T., Chiao, B., Xu, T., et al., The heart-brain axis: a proteomics study of meditation on the cardiovascular system of Tibetan monks. EBioMedicine 2022;80:104026.doi:10.1016/j.ebiom.2022.104026pmid:http://www.ncbi.nlm.nih.gov/pubmed/35576643
Cardiophenomenology
An approach inspired by neurophenomenology which seeks correlations between cardiac physiology and subjective experiences — of emotions in particular. Many R/S/M traditions consider the heart to be the correlate of a deeper level of consciousness and health, with the brain being the correlate of a more superficial, habitual, action-related consciousness, with the aim of contemplative practice being to move from the latter to the former. Dzogchen, Orthodox Christianity (Prayer of the heart, prayer dropping to the heart), Sacred Heart of Jesus, etc.
Depraz, N., & Desmidt, T. (2015). Cardiophénoménologie [Cardiophenomenology]. Les Cahiers philosophiques de Strasbourg, 38, 47–83. https://doi.org/10.4000/cps.464
Gurung, G. S. (2019). Self-arising three-fold embodiment of enlightenment. Bright Alliance.
Vlachos, H., Rōmanidēs, I. S., & Mavromichali, E. (2012). Empirical dogmatics of the Orthodox Catholic Church: according to the spoken teaching of Father John Romanides (1st ed.). Birth of the Theotokos Monastery.