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How the Hearbeatrate changes per second

Hello,

I am working with Hearbeat rate calculator.But I want to know how the heartbeat rate changes per second and I can see most of the TI designed including pulse oximeter will give out the hearbeat rate after 1 minute.

can someone provide some materials or information regarding how th hearbeat rate changes per second for a person and how it in the entire day.

Thankyou.