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Baroreflex function in sedentary and endurance-trained elderly people

A J Bowman1, R H Clayton, A Murray

  • 1Department of Pharmacological Sciences, The University, Newcastle upon Tyne, UK.

Age and Ageing
|July 1, 1997
PubMed
Summary

Aging reduces baroreflex function, affecting heart rate and blood pressure regulation. Endurance exercise training in older adults partially preserves high-frequency baroreflex sensitivity, suggesting fitness mitigates some age-related decline.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Aging Research

Background:

  • Baroreflex function, crucial for cardiovascular homeostasis, may decline with age.
  • Endurance exercise is known to influence cardiovascular health, but its specific impact on age-related baroreflex changes requires further investigation.

Purpose of the Study:

  • To investigate the effects of aging and endurance exercise training on baroreflex sensitivity in healthy individuals.
  • To compare baroreflex function across young, elderly sedentary, and elderly endurance-trained groups.

Main Methods:

  • A cross-sectional study involving three groups: young healthy subjects, elderly sedentary subjects, and elderly endurance-trained athletes.
  • Baroreflex sensitivity was quantified using the alpha-index (high frequency and mid frequency) derived from spontaneous fluctuations in heart rate and blood pressure.

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Main Results:

  • Sedentary elderly subjects exhibited lower high-frequency (HF) and mid-frequency (MF) alpha-index values compared to young subjects.
  • Elderly endurance-trained athletes showed significantly higher HF alpha-index values than sedentary elderly subjects, approaching levels seen in young subjects.
  • MF alpha-index values were similar between elderly endurance-trained athletes and sedentary elderly subjects, but lower than in young subjects.

Conclusions:

  • Both HF and MF components of the baroreflex decrease with age.
  • Endurance exercise training in older adults helps preserve the HF component of baroreflex sensitivity.
  • Physical fitness and activity levels may play a role in mitigating age-related declines in baroreflex function.