The whole strategy and approach of war would change.
I mean back when people would use swords and shields in battle. That would be near impossible if bodies exploded when the heart stops, all the bodies that would be on the battle field, exploding at random times killing people, who would then explode.
In order to suffer less casualties, during battle there would have to be some way to get rid of the dead bodies of those around you on the battlefield. Would change everything, we would probably have completely different weapons and ways of fighting.