Relating to the ability to change the rate or rhythm of the heartbeat, especially in response to a substance or stimulus.
From Greek 'chronos' (time) and 'tropos' (turning/direction), combined with the medical suffix '-ic'. This term emerged in 19th-century medicine as doctors studied how drugs and hormones affected heart rate.
Adrenaline is positively chronotropic—it speeds up your heart during fight-or-flight moments, while some medicines are negatively chronotropic to help calm racing hearts. It's basically your body's built-in accelerator and brake pedal for your heartbeat!
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