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Related Concept Videos

Heart Failure II: Pathophysiology01:29

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Related Experiment Video

Updated: Apr 29, 2026

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
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Endothelin-A-mediated vasoconstriction during exercise with advancing age.

Zachary Barrett-O'Keefe1, Stephen J Ives2, Joel D Trinity2

  • 1Department of Exercise and Sport Science, University of Utah, Salt Lake City. Geriatric Research, Education, and Clinical Center, Salt Lake City Veterans Affairs Medical Center, Utah.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|May 14, 2014
PubMed
Summary

Aging increases endothelin subtype A (ET(A)) receptor activity, constricting blood vessels during exercise in older adults. Blocking ET(A) receptors improved blood flow, revealing a key pathway for regulating circulation in the elderly.

Keywords:
Aging.ArterialBloodEndothelin-1Exerciseblood pflowressure

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Area of Science:

  • Cardiovascular Physiology
  • Aging Research
  • Vascular Biology

Background:

  • The endothelin-1 pathway, particularly the endothelin subtype A (ET(A)) receptor, is implicated in age-related increases in resting vascular tone.
  • The role of ET(A)-mediated vasoconstriction during exercise in older adults remains unclear.

Purpose of the Study:

  • To investigate the influence of ET(A) receptor blockade on leg blood flow and oxygen consumption during exercise in young and older adults.

Main Methods:

  • 17 healthy volunteers (8 young, 9 old) underwent assessments of leg blood flow, mean arterial pressure, and leg oxygen utilization at rest and during knee-extensor exercise.
  • Intra-arterial administration of the ET(A) antagonist BQ-123 was performed before and after exercise.

Main Results:

  • BQ-123 administration during exercise led to a greater increase in leg blood flow in older adults compared to younger adults.
  • This enhanced blood flow was associated with increased leg oxygen consumption, suggesting reduced circulatory efficiency after ET(A) blockade.

Conclusions:

  • An age-related increase in ET(A)-mediated vasoconstriction persists during exercise.
  • The ET(A) pathway plays a significant role in regulating skeletal muscle blood flow and maintaining blood pressure in the elderly.