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Changes in heart rate variability with age

M Reardon1, M Malik

  • 1Department of Cardiological Sciences, St. George's Hospital Medical School, London, United Kingdom.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1996
PubMed
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Aging significantly reduces overall heart rate variability (HRV), impacting autonomic responses. However, short-term HRV components, reflecting vagal activity, remain unaffected by age.

Area of Science:

  • Cardiology
  • Gerontology
  • Autonomic Nervous System Physiology

Background:

  • Depressed heart rate variability (HRV) post-myocardial infarction correlates with mortality, linked to autonomic imbalance.
  • Aging is known to depress HRV, but its specific effects on parasympathetic activity require further investigation.

Purpose of the Study:

  • To investigate the impact of aging on heart rate variability (HRV) and parasympathetic activity in healthy adults.
  • To compare HRV parameters, specifically HRV triangular index and RMSSD, between younger and older age groups.

Main Methods:

  • Utilized 24-hour Holter recordings in 56 healthy subjects (age 40-102 years).
  • Measured HRV using the HRV triangular index (overall HRV) and RMSSD (short-term, vagal modulation).
  • Compared HRV parameters between subjects younger than 70 and older than 70 years.

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Main Results:

  • A significant decrease in HRV triangular index was observed with increasing age (r = -0.4, P < 0.05).
  • Subjects older than 70 years showed a significantly lower HRV index compared to those younger than 70 (P < 0.02).
  • No significant age-related changes were found in RMSSD (r = -0.08, P = NS), indicating maintained short-term vagal modulation.

Conclusions:

  • Aging reduces global HRV, potentially indicating diminished autonomic responsiveness to environmental stimuli.
  • Short-term, time-domain HRV components (RMSSD), reflecting vagal activity, are preserved with age.
  • Fast vagal modulations of heart rate appear to be maintained despite age-related declines in overall HRV.