Wiktionary
a. That affects or changes the heart rate or pulse (i.e. the time between "p waves").
Wikipedia
Chronotropic effects (from chrono-, meaning time, and tropos, "a turn") are those that change the heart rate.
Chronotropic drugs may change the heart rate and rhythm by affecting the electrical conduction system of the heart and the nerves that influence it, such as by changing the rhythm produced by the sinoatrial node. Positive chronotropes increase heart rate; negative chronotropes decrease heart rate.
A dromotrope affects atrioventricular node (AV node) conduction. A positive dromotrope increases AV nodal conduction, and a negative dromotrope decreases AV nodal conduction. A lusitrope is an agent that affects diastolic relaxation.
Usage examples of "chronotropic".
The physics team had planted chronotropic sensors at various points along the paths and walkways between the Tombs, both to alert the monitors to variations of the tides and to warn the visitors.