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Postexercise hypotension is not explained by a prostaglandin-dependent peripheral vasodilation.

Jennifer M Lockwood1, Mollie P Pricher, Brad W Wilkins

  • 1Department of Human Physiology, University of Oregon, Eugene, Oregon 97403-1240, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 7, 2004
PubMed
Summary

Prostaglandin production does not cause postexercise hypotension. Inhibiting prostaglandins with ibuprofen did not alter blood pressure changes after aerobic exercise, suggesting other mechanisms are responsible for this common physiological response.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Regulation
  • Pharmacology

Background:

  • Postexercise hypotension is a common phenomenon following aerobic exercise, characterized by a reduction in blood pressure.
  • Peripheral vasodilation is believed to be the primary cause of postexercise hypotension, but the exact mechanisms remain unclear.
  • Prostaglandins are known mediators of vasodilation during and after exercise, but their role in postexercise hypotension has not been established.

Purpose of the Study:

  • To investigate the potential contribution of prostaglandin-dependent vasodilation to postexercise hypotension.
  • To determine if inhibiting prostaglandin production affects the systemic vascular conductance changes associated with postexercise hypotension.

Main Methods:

  • A randomized controlled trial involving 11 healthy men performing a 60-minute cycling exercise bout.

Related Experiment Videos

  • Participants received either a placebo (control) or ibuprofen (cyclooxygenase inhibitor) to block prostaglandin production.
  • Systemic vascular conductance and mean arterial pressure were measured before and for 90 minutes after exercise.

    • Main Results:

    • Ibuprofen administration did not affect baseline blood pressure or vascular conductance.
    • Both control and ibuprofen conditions showed a significant reduction in mean arterial pressure and an increase in systemic vascular conductance postexercise.
    • No significant differences in the magnitude of hypotension or vascular conductance were observed between the ibuprofen and control conditions.

    Conclusions:

    • Prostaglandin-dependent vasodilation does not appear to contribute to the increased systemic vascular conductance observed during postexercise hypotension.
    • These findings suggest that other vasodilatory pathways are responsible for the blood pressure-lowering effects after aerobic exercise.