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Related Concept Videos

Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
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Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Regulation of Heart Rates01:31

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Doppler Ultrasound-Based Leg Blood Flow Assessment During Single-Leg Knee-Extensor Exercise in an Uncontrolled Setting
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Spontaneous bursts of muscle sympathetic nerve activity decrease leg vascular conductance in resting humans.

Seth T Fairfax1, Jaume Padilla, Lauro C Vianna

  • 1Department of Biomedical Sciences, University of Missouri, Columbia, MO 65212 ,USA.

American Journal of Physiology. Heart and Circulatory Physiology
|January 8, 2013
PubMed
Summary

This study reveals that muscle sympathetic nerve activity (MSNA) directly and dynamically controls vascular tone beat-by-beat. Spontaneous MSNA bursts cause significant decreases in leg vascular conductance (LVC) in resting humans.

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Area of Science:

  • Physiology
  • Cardiovascular Regulation
  • Autonomic Nervous System

Background:

  • Previous studies on sympathetic vascular transduction relied on large, reflex-mediated increases in muscle sympathetic nerve activity (MSNA).
  • These methods did not allow for assessment of MSNA's dynamic, beat-by-beat control of vascular tone.
  • Understanding the beat-by-beat influence of MSNA on vascular resistance is crucial for comprehending autonomic cardiovascular regulation.

Purpose of the Study:

  • To investigate the influence of spontaneous muscle sympathetic nerve activity (MSNA) bursts on leg vascular conductance (LVC) on a beat-by-beat basis.
  • To determine how variations in MSNA burst patterns (single vs. multiple) and burst size affect the magnitude of the LVC response.
  • To provide the first assessment of beat-by-beat sympathetic vascular transduction in resting humans.

Main Methods:

  • Continuous recording of arterial blood pressure, common femoral artery blood flow, and MSNA in 11 young men during supine rest.
  • Utilizing signal averaging to analyze percent changes in LVC for 15 cardiac cycles following heartbeats with and without MSNA bursts.
  • Correlating individual MSNA burst amplitudes and consecutive burst totals with peak decreases in LVC.

Main Results:

  • Leg vascular conductance (LVC) significantly decreased following MSNA bursts, reaching a nadir around the 6th cardiac cycle (single bursts: -2.9%; multiple bursts: -11.0%).
  • The magnitude of LVC decrease was directly related to individual MSNA burst amplitudes and total amplitude of consecutive bursts.
  • Cardiac cycles without MSNA bursts were associated with a significant increase in LVC (+3.1%), indicating dynamic sympathetic control.

Conclusions:

  • This study provides the first evidence of beat-by-beat sympathetic vascular transduction in resting humans.
  • Spontaneous MSNA bursts dynamically and robustly decrease leg vascular conductance.
  • The observed dynamic control of vascular tone by MSNA is absent during cardiac cycles without sympathetic bursts.