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Related Experiment Videos

Muscle metaboreflex-induced increases in stroke volume.

Antonio Crisafulli1, Adam C Scott, Roland Wensel

  • 1Interdepartmental Centre of Technologies and Environments Related to Sport, University of Cagliari, Cagliari, Italy. crisaful@unica.it

Medicine and Science in Sports and Exercise
|February 6, 2003
PubMed
Summary

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The muscle metaboreflex, triggered by metabolic by-products, increases blood pressure by enhancing cardiac output, not vascular resistance. This response is specific to exercise-induced metaboreflex activation.

Area of Science:

  • Exercise Physiology
  • Cardiovascular Physiology
  • Skeletal Muscle Metabolism

Background:

  • Metabolic by-products accumulating in skeletal muscle can stimulate sensory nerves.
  • This stimulation can evoke a pressor response known as the muscle metaboreflex.

Purpose of the Study:

  • To evaluate changes in central hemodynamics during muscle metaboreflex activation.
  • To understand the cardiovascular adjustments in response to the muscle metaboreflex.

Main Methods:

  • Seven healthy subjects participated in the study.
  • The muscle metaboreflex was induced by postexercise regional circulatory occlusion following mild rhythmic forearm exercise.
  • Central hemodynamics were assessed using impedance cardiography.

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Main Results:

  • Metaboreflex activation increased mean blood pressure by 13% (P < 0.01).
  • Myocardial contractility was enhanced (preejection period/left ventricular ejection time ratio decreased by 12%; P < 0.01).
  • Diastolic time was prolonged (11%; P < 0.01), stroke volume increased (10%; P < 0.05), and cardiac output rose (6%; P < 0.05).
  • These hemodynamic changes were specific to exercise-induced metaboreflex activation and not observed during occlusion without prior exercise or during recovery without occlusion.
  • Systemic vascular resistance remained unaffected, and bradycardia was observed relative to recovery without occlusion.

Conclusions:

  • The pressor response during metaboreflex activation post-exercise is primarily driven by an increased capacity to augment cardiac output.
  • This suggests that the cardiovascular adjustments to the muscle metaboreflex rely on cardiac function rather than vasoconstriction.