• "CHAMBER RESTRICTED ENVIRONMENTAL STIMULATION AND HEART RATE VARIABILITY" (PDF). {{ cite journal}}: Cite journal requires |journal= ( help)

• Edwards, S.D. (2016). "Influence of HeartMath quick coherence technique on psychophysiological coherence and feeling states" (PDF). African Journal for Physical Activity and Health Sciences. 22 (4:1): 1006–1018.

• Edwards, S.D. (2014). "Effects of biofeedback training on physiological coherence, health and spirituality perceptions" (PDF). African Journal for Physical, Health Education, Recreation and Dance. 20 (2:1): 500–510.

• Loudon, Gareth H.; Deininger, Gina M. (2017). "The Physiological Response to Drawing and Its Relation to Attention and Relaxation". Journal of Behavioral and Brain Science. 07 (3): 111. doi: 10.4236/jbbs.2017.73011.{{ cite journal}}: CS1 maint: unflagged free DOI ( link)

Loudon, G.H. and Deininger, G.M. (2017) The Physiological Response to Drawing and Its Relation to Attention and Relaxation. Journal of Behavioral and Brain Science, 7, 111-124.

• . doi: 10.1161/01.CIR.94.11.2850. {{ cite journal}}: Cite journal requires |journal= ( help); Missing or empty |title= ( help)

• . doi: 10.1161/01.CIR.93.5.1043. {{ cite journal}}: Cite journal requires |journal= ( help); Missing or empty |title= ( help)

• . doi: 10.1016/j.neubiorev.2011.11.009. {{ cite journal}}: Cite journal requires |journal= ( help); Missing or empty |title= ( help)

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External Links

• https://slatestarcodex.com/2014/07/17/heartmath-considered-incoherent/