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Related Experiment Videos

Does aging differentially reduce heart rate variability related to respiration?

J R Jennings, M E Mack

    Experimental Aging Research
    |January 1, 1984
    PubMed
    Summary

    Heart rate variability declines with age, but not primarily due to reduced respiratory influences. This study found that vagal control (respiratory sinus arrhythmia) decreased less than sympathetic-related vasomotor frequencies in older men.

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    Area of Science:

    • Cardiovascular Physiology
    • Autonomic Nervous System Function
    • Human Aging Research

    Background:

    • Heart rate variability (HRV) reflects autonomic nervous system (ANS) modulation of the heart.
    • Age-related decline in HRV is well-documented, but the specific contributions of vagal and sympathetic activity remain debated.
    • Different frequency bands in HRV spectral analysis are associated with distinct ANS components.

    Purpose of the Study:

    • To investigate age-related changes in spectral power of resting heart rate.
    • To differentiate the impact of aging on vagal and sympathetic cardiac control components of HRV.
    • To determine if the decline in HRV with age is predominantly linked to respiratory-related frequencies.

    Main Methods:

    • Resting heart rate segments from 56 male volunteers (aged 18-65 years) were analyzed.

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  • Spectral analysis was employed to quantify power in different heart rate variability frequency bands.
  • Comparison of spectral power changes with age was performed, distinguishing respiratory frequencies from lower (vasomotor) frequencies.

    • Main Results:

    • Respiratory sinus arrhythmia, associated with vagal control, showed a less pronounced decline with age compared to lower (vasomotor) frequencies.
    • Total power at respiratory frequencies demonstrated an expected decrease with increasing age.
    • The findings suggest that the overall reduction in HRV with age is not solely attributable to diminished respiratory-related frequency power.

    Conclusions:

    • The age-related decline in heart rate variability may not be predominantly driven by a reduction in vagal-mediated respiratory frequencies.
    • Vasomotor frequency power, potentially reflecting sympathetic influences, appears to decrease more significantly with age than respiratory influences.
    • Further research is needed to fully elucidate the complex interplay of autonomic control in cardiovascular aging.