Why does lying affect heart rate?

Depends on the lie- a little white lie probably won't affect your heart rate. But lying in a stressful situation will cause your body to release adrenaline and cortisol which increases your heartbeat in preparation of fight or flight. However, even if you are telling the truth, just being in a stressful situation can have the same effect. read more

It results from brain emotions, which influence cardiovascular center that is maintaining the heart activity, that in turn influence the heart rate & heart stroke intensity. Perfect liars do not have this connection between the emotions and cardiovascular center or lost it due to training. read more

Still, there could be more to it than the relationship factor, experts contend. Research on how lying affects health is scant, but lying is thought to trigger the release of stress hormones, increasing heart rate and blood pressure. read more