Read the whole article on PDF here: The Enegetic Heart: Bioelectromagnetic Interactions Within and Between People
The paper concludes with:
Acting as a synchronizing force within the body, a key carrier of emotional information, and an apparent mediator of a type of subtle electromagnetic communication between people, the cardiac bioelectromagnetic field may have much to teach us about the inner dynamics of health and disease as well as our interactions with others.
This publication is actually quite old, having been published in 2003. More recent information on the topic can be read at the Institute of HeartMath.