Pre-race nervousness and adrenaline (arousal) elevate heart rate before the race even begins, so heart rate will already be elevated at the start line and will continue to be elevated in response to psychological stress even before physical effort begins.
factualpending
Evidence Quote
“I'm sure you felt this you're standing on the start line of a race that that nervousness the butterflies that are happening that adrenaline that then goes that's a heart rate response and so we call that a stress or an arousal and so when you're standing at that race that's adrenaline that's happening and so what's going to happen is your heart rate is going to be elevated”
Created: 8/13/2026, 10:26:22 AM
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