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The 20 pages that link to Heart rate, each with the reason it gives.

• Cardiac outputRelated: It is one factor multiplied by stroke volume to determine cardiac output.

• Physical activityRelated: Heart rate commonly rises with activity intensity and helps estimate effort.

• QT intervalRelated: Faster rates generally shorten the measured QT interval.

• Parasympathetic nervous systemRelated: Vagal parasympathetic signals can slow the sinoatrial node.

• Fight-or-flight responseBroader topic: An increase helps deliver oxygenated blood to active muscles during the response.

• Cardiac rehabilitationRelated: Clinicians may use heart-rate response alongside symptoms and workload to monitor exercise.

• HertzCompared with: It is a frequency, but medicine usually reports it in beats per minute rather than hertz.

• BaroreflexRelated: The reflex changes heart rate to alter cardiac output and pressure.

• Vasovagal syncopeRelated: Reflex slowing of the heart can compound the fall in blood pressure.

• BiathlonRelated: Managing exertion helps biathletes stabilize before shooting.

• Vital signsRelated: A pulse commonly provides a bedside estimate of heart rate.

• Exercise intensityRelated: Heart rate rises with effort and is used to track relative exercise intensity.

• Heart rate variabilityCompared with: Average rate and interval variability describe different properties of the heartbeat sequence.

• ArrhythmiaNarrower topic: Rate is one dimension of rhythm abnormality, but a normal rate does not rule out irregularity.

• Postural orthostatic tachycardia syndromeRelated: Its sustained increase after standing is central to POTS diagnostic criteria.

• PalpitationsRelated: A sensation of racing often corresponds to an elevated heart rate, though not always.

• Sinus tachycardiaNarrower topic: Sinus tachycardia is a specific increase in heart rate.

• TachycardiaNarrower topic: Tachycardia is defined by an elevated value of this measure.

• PulseCompared with: A weak or absent peripheral beat can make the palpable pulse rate lower than the heart rate.

• AerobicsRelated: Exercise intensity is often monitored by tracking how aerobics raises heart rate.