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Exercise training and the arterial baroreflex.

T G Bedford1, C M Tipton

  • 1Exercise Science Program, University of Iowa, Iowa City 52240.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1987
PubMed
Summary
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Endurance training attenuates the carotid sinus baroreflex in rats, making trained individuals more vulnerable during low blood pressure episodes. This study highlights how exercise impacts the body's blood pressure regulation system.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Autonomic Nervous System Regulation

Background:

  • The carotid sinus baroreflex is crucial for maintaining blood pressure homeostasis.
  • The impact of endurance training on baroreflex sensitivity is not fully understood.
  • Understanding this interaction is vital for assessing cardiovascular health in athletes.

Purpose of the Study:

  • To investigate the effect of endurance training on carotid sinus baroreflex function in rats.
  • To determine if exercise training attenuates the baroreflex control of blood pressure.
  • To assess the sympathetic component of the arterial baroreflex after training.

Main Methods:

  • Comparison of 25 nontrained (NT) and 22 trained (T) male Sprague-Dawley rats.

Related Experiment Videos

  • Functional isolation of the carotid sinus region in anesthetized animals.
  • Gradual increases in carotid sinus pressure to measure systemic arterial pressure and regional blood flows.

    • Main Results:

    • Maximal oxygen consumption increased by 10% in trained rats.
    • Trained rats exhibited a less responsive baroreflex control of blood pressure and regional resistance compared to NT rats.
    • Resting blood pressure, heart rate, and peripheral blood flow responses were similar between groups.

    Conclusions:

    • Endurance training significantly attenuates arterial baroreflex control of blood pressure.
    • Trained individuals may be at a disadvantage during hypotensive events.
    • Endurance exercise training reduces the sympathetic component of the arterial baroreflex.