By listening to her own heartrate through headphones, Soledad is learning to unwind. This is an example of measurement of Auditory Evoked Potentials (AEPs).
Heartrate, the rhythmic widening and narrowing of an artery caused by the heart's aortic valve. When surrounding muscles are relaxed, it is easier to feel a pulse by exerting firm fingertip pressure to the skin at points where the arteries pass close to the skin's surface.
Heartrate, strength, and rhythm can give useful diagnostic information; for example, a consistent shift between strong and weak pulses might suggest heart failure. A quick pulse might signal significant cardiac illness, a relatively harmless fever, or just hard activity; a slow pulse can be caused by a head injury, but it is also typical in highly trained athletes with great heart function.
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