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The 8 pages that link to Heart rate variability, each with the reason it gives.

• Autonomic nervous systemRelated: Its patterns provide an indirect measure of autonomic influences on the heart.

• QT intervalRelated: Changing cycle lengths can complicate interpretation of a single QT measurement.

• BradycardiaCompared with: A low average rate is different from variation in beat-to-beat timing.

• Parasympathetic nervous systemRelated: Some measures track vagal influences, but they are not direct readings of whole-body parasympathetic tone.

• Vagus nerveRelated: Beat-to-beat variation can reflect cardiac autonomic regulation, including vagal influence, but is not a direct measure of nerve activity.

• Heart rateRelated: Beat-to-beat timing adds information that an average rate cannot show.

• PranayamaRelated: Researchers use it to study cardiovascular responses to paced breathing.

• Holter monitorRelated: Holter data can quantify beat-to-beat timing across extended periods.