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Rapid onset vasodilation during baroreceptor loading and unloading.

Olivia K Leach1, Jayson R Gifford1, Gary W Mack1

  • 1Department of Exercise Sciences, Brigham Young University, Provo, Utah, United States.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|September 11, 2023
PubMed
Summary
This summary is machine-generated.

The rapid onset vasodilation (ROV) after muscle contraction is influenced by baroreceptor pressure changes. Adjusting for peak muscle force is crucial for accurate ROV comparisons in studies of vascular responses.

Keywords:
LBNPLBPPROVbaroreceptorrapid onset vasodilation

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Autonomic Nervous System

Background:

  • Muscle contraction elicits rapid onset vasodilation (ROV), a key vascular response.
  • Baroreceptor loading and unloading can modulate autonomic nervous system activity.
  • The interplay between muscle contraction-induced vasodilation and baroreceptor reflexes is not fully understood.

Purpose of the Study:

  • To investigate whether baroreceptor loading and unloading alter the increase in vascular conductance post-muscle contraction.
  • To determine the relationship between peak muscle force and ROV.
  • To test if changes in baroreceptor pressure proportionally affect ROV.

Main Methods:

  • Participants underwent single muscle contractions at 50% of maximal voluntary contraction.
  • Brachial artery blood flow (Doppler ultrasound) and mean arterial pressure (Finapress) were measured.
  • Vascular conductance was calculated, and ROV was quantified using lower body positive and negative pressure (LBPP/LBNP) to manipulate baroreceptor input.

Main Results:

  • ROV was found to be linearly proportional to the peak force of the muscle contraction.
  • ROV was significantly reduced during baroreceptor unloading (e.g., -40 mmHg LBNP) compared to control.
  • ROV increased with baroreceptor loading (e.g., +20 mmHg LBPP) and showed a linear relationship with chamber pressure across tested ranges.

Conclusions:

  • Physiologically relevant alterations in vasoconstrictor tone, induced by baroreceptor manipulation, proportionally change ROV.
  • Peak muscle force must be considered as a covariate when comparing ROV across individuals or conditions.
  • Accurate assessment of ROV requires accounting for both muscle contraction intensity and baroreceptor status.