Term
Heart rate variability
How much the intervals between heartbeats vary. It is used as a sign of how tense or calm the body is.
Becoming Supernatural: How Common People Are Doing the Uncommon, Joe Dispenza
Explained in
- Becoming Supernatural: How Common People Are Doing the Uncommon, Joe Dispenza
- The Willpower Instinct, Kelly McGonigal
How much the intervals between heartbeats change. The author cites research associating it with self-control; an association does not establish that one causes the other.