Low resting heart rate (bpm < 70) is the best physiological predictor of violent/antisocial behavior.
In a remarkable longitudinal study of over 700,000 men, those with the lowest RHR:
-were the most likely to commit both violent and non-violent crime
-had a 31% increased risk of getting into a car crash
-were 41% more likely to be injured as a result of assault
-demonstrated an earlier onset of criminality than those with a RHR > 82 bpm
When adjusted for confounders (ex: socioeconomic status, physical activity), the relationships between low RHR and antisocial behavior became even stronger.