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heart rate variability (HRV)

Physiology: - heart rate variabilty is a measure of cardiac autonomic function [1] - heart rate in normal individuals under complete autonomic blockade is 100 beats/min [1] - higher resting heart rate & lower heart rate variability are associated with functional decline in older adults [2]* * due to age-associated changes in the autonomic nervous system Pathology: - diminished heart rate variability is associated with increased cardiovascular risk [1] Management: - exercise improves heart rate variability, regardless of age [1] - maximum heart rate may be refractory to exercise

Related

age-associated changes in cardiovascular function age-associated changes in the autonomic nervous system heart rate maximum heart rate (MHR)

Specific

fetal heart rate variability

References

  1. Soares-Miranda L et al Physical Activity and Heart Rate Variability in Older Adults: The Cardiovascular Health Study. Circulation. May 5, 2014 PMID: 24799513 http://circ.ahajournals.org/content/early/2014/04/15/CIRCULATIONAHA.113.005361.abstract - Poirier P Exercise, Heart Rate Variability, and Longevity: The Cocoon Mystery? Circulation. May 5, 2014 PMID: 24799512 http://circ.ahajournals.org/content/early/2014/04/15/CIRCULATIONAHA.114.009778.abstract
  2. Ogliari G, Mahinrad A, Stott DJ et al Resting heart rate, heart rate variability and functional decline in old age. CMAJ. Aug 31, 2015 PMID: 26323697 http://www.cmaj.ca/content/early/2015/08/31/cmaj.150462.full.pdf+html