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Related Experiment Videos

Muscle chemoreflex causes renal vascular constriction

S W Mittelstadt1, L B Bell, K P O'Hagan

  • 1Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, USA.

The American Journal of Physiology
|March 1, 1996
PubMed
Summary

The muscle chemoreflex impacts renal vascular conductance, decreasing it when hindlimb blood flow is significantly reduced. This effect is independent of renal sympathetic nerve activity.

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Area of Science:

  • Physiology
  • Cardiovascular Research
  • Renal Physiology

Background:

  • The muscle chemoreflex is a critical cardiovascular reflex.
  • Its influence on renal vascular conductance, particularly in innervated versus denervated kidneys, requires further elucidation.

Purpose of the Study:

  • To investigate the role of the muscle chemoreflex in modulating renal vascular conductance.
  • To determine if renal sympathetic nerve activity mediates these effects.

Main Methods:

  • Experiments were conducted on six dogs subjected to treadmill exercise.
  • Muscle chemoreflex was stimulated by progressively reducing hindlimb blood flow (HLBF).
  • Arterial blood pressure and renal vascular conductance were monitored.

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Main Results:

  • Significant reductions in HLBF led to increased arterial blood pressure and decreased renal vascular conductance.
  • Decreased renal vascular conductance occurred at similar HLBF thresholds in both denervated and innervated kidneys.
  • The observed changes were not significantly different between innervated and denervated kidneys.

Conclusions:

  • Reductions in hindlimb blood flow trigger a decrease in renal vascular conductance.
  • This response is independent of renal sympathetic nerve activity, suggesting non-neuronal mechanisms are involved.