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Cardiovascular function following reduced aerobic activity

P B Raven1, R M Welch-O'Connor, X Shi

  • 1Department of Integrative Physiology, University of North Texas Health Science Center at Fort Worth 76107, USA.

Medicine and Science in Sports and Exercise
|July 15, 1998
PubMed
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Physical deconditioning reduces cardiovascular regulatory function and lower body negative pressure tolerance. Despite increased baroreflex sensitivity, reduced stroke volume response leads to decreased tolerance.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Autonomic Nervous System Function

Background:

  • Sustained physical inactivity, or deconditioning, is common in various populations.
  • Understanding its impact on cardiovascular regulation is crucial for health and performance.
  • Previous research suggests deconditioning affects cardiovascular responses, but specific mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the hypothesis that reduced physical activity alters cardiovascular regulatory function.
  • To quantify changes in hemodynamic and baroreflex responses following a period of deconditioning.

Main Methods:

  • Nineteen healthy young adults underwent 8 weeks of physical deconditioning.
  • Cardiovascular responses (heart rate, mean arterial pressure, central venous pressure, stroke volume, forearm blood flow) were measured during lower body negative pressure (LBNP) before and after deconditioning.
Keywords:
NASA Discipline CardiopulmonaryNon-NASA Center

Related Experiment Videos

  • Carotid and aortic baroreflex functions were assessed using neck pressure/suction and phenylephrine infusion protocols.

    • Main Results:

    • Deconditioning reduced maximal oxygen uptake and LBNP tolerance by 7% and 13%, respectively.
    • Stroke volume drop during LBNP increased significantly post-deconditioning, accompanied by greater tachycardia.
    • Aortic baroreflex sensitivity and forearm vascular resistance response to central venous pressure were enhanced after deconditioning.

    Conclusions:

    • Reduced tolerance to LBNP after deconditioning is linked to altered cardiac pressure-volume relationships.
    • Despite enhanced baroreflex function, deconditioning impairs cardiovascular regulatory capacity.
    • These findings highlight the physiological consequences of physical inactivity on cardiovascular control.