“The quality of our heart’s rhythm has consequences for our overall health. If the heart beats in harmonious rhythms, its efficiency reduces stress on other systems of the body, maximizes our energy, and creates states whereby we thrive mentally, emotionally, and physically. 
If there is disharmony in our heart rhythms, the opposite is true. This incoherence leaves us with less energy available for healing and for maintaining health and long-term building projects, creating unrest within our internal states and putting increased stress on the heart and other organs.
Heart attacks and heart disease, for example, occur when the body has been under stress for extended periods of time. When we intentionally choose elevated emotions, however, focusing less on disharmony and more on gratitude, our bodies respond positively and we enjoy improved health.
In 1991, the pioneering work by Dr. J. Andrew Armour showed that the heart literally has a mind of its own. The heart has a nervous system that functions independently of the brain. The technical term coined for this system is the intrinsic cardiac nervous system, more commonly known as the ‘heart-brain.’ The heart sends signals to the brain so that stress and anxiety can trigger brain wave patterns to match an anxiety pattern of past heart emotions.
For 25 years, researchers at the HeartMath Institute have innovated tools and methods designed to achieve measurable heart/brain coherence. HeartMath has focused on the psychophysiology of stress, emotions, and heart/brain interaction. Working within the parameters of the prevailing scientific model, these researchers have produced and published over 300 peer-reviewed or independent studies of the effectiveness of HeartMath techniques and technologies. Their research documents several types of beneficial outcomes for achieving heart/mind coherence.
Rollin McCraty Ph.D., one of the original founders of Heartmath, said, ‘The biggest hidden source of stress on the planet is the disorganization of heart/mind, causing lack of resonance. Lack of alignment eats the life force and happiness out of humanity. However, loving-kindness practices shift the heart into a different state, called coherence, a synchronized heart/brain neurology,’ McCraty said.
HeartMath Institute has developed practices and technologies to support heart/brain coherence, but McCraty shared some fundamental principles. ‘The HeartMath tools, techniques, and training process all have one thing in common — they operate in the present moment. The method is to 1. focus on the heart, 2. activate compassion, 3. and radiate that feeling to self and others.’ This simple, deliberate method can relieve stress, anxiety, or depression, and lead to all the countless other benefits of heart coherence.”
Becoming Supernatural – How Common People Are Doing The Uncommon, Dr. Joe Dispenza, pgs. 167 – 170, gaia.com