Heart Racing Before a Presentation: What's Actually Happening
A pounding heart before presenting can feel alarming. Understanding exactly why it happens — and that it's a normal physiological response, not a sign something is wrong — changes how you relate to it.
is the typical heart rate increase during the fight-or-flight response — from a resting ~70 bpm to 140+ bpm. This is adrenaline acting on the sinoatrial node, not a cardiac event.
The physiology: adrenaline and the sinoatrial node
When your amygdala identifies public speaking as a social threat, it triggers the hypothalamic-pituitary-adrenal axis to release adrenaline from the adrenal glands. Adrenaline binds to beta-1 adrenergic receptors in the sinoatrial node — the heart's natural pacemaker — causing both increased heart rate (tachycardia) and increased contraction force.
This is designed to deliver more oxygenated blood to large muscles for physical action. The problem is that presenting requires fine motor control and cognitive clarity, not the physical exertion the adrenaline is preparing you for. The elevated heart rate is a mismatch between the threat your brain has identified and the response it needs.
A racing heart feels alarming. It is actually just your body preparing for exertion you won't need. The feeling is real; the danger is not.
What works
Extended-exhale breathing (fastest)
Inhale 4 counts, hold 2, exhale 7. This directly stimulates the vagus nerve — the parasympathetic pathway that counters the sympathetic (adrenaline) response. Heart rate measurably reduces within 60 seconds. Do this before entering the room.
Accept the sensation as adrenaline, not danger
Labelling the racing heart as 'adrenaline preparing me to perform' rather than 'something is wrong' reduces the secondary anxiety that amplifies it. This is cognitively reframing the sensation — evidence suggests it meaningfully reduces its intensity.
Beta-blockers (discuss with your GP)
Propranolol blocks beta-adrenergic receptors, preventing adrenaline from raising your heart rate at all. Effective, fast-acting, and does not cause sedation. Prescription-only and has contraindications — discuss with a doctor.
Graduated practice (long-term)
As presentations become less threatening through repeated exposure, the amygdala's threat appraisal reduces — less adrenaline is released, and the heart rate response diminishes. The only intervention that produces lasting change.
A racing heart is identical to the physical experience of excitement. Research by Alison Wood Brooks at Harvard found that telling yourself 'I am excited' before a presentation significantly improves performance compared to trying to calm down.
Chest pain, shortness of breath at rest, or an irregular heartbeat alongside a racing heart — seek medical assessment before the next presentation. These are distinct from anxiety tachycardia and warrant clinical evaluation.
Key terms
- Sinoatrial node
- The heart's natural pacemaker — a cluster of cells in the right atrium that generates the electrical impulses controlling heart rate. Directly stimulated by adrenaline.
- Tachycardia
- Elevated heart rate above the normal resting range. Anxiety-induced tachycardia is caused by adrenaline and is not medically dangerous in healthy individuals.
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