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Updated: Aug 1, 2025

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
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Resistance exercise acutely elevates dynamic cerebral autoregulation gain.

Oliver J Smail1, Daniel J Clarke1, Qais Al-Alem1

  • 1Exeter Head Impacts, Brain Injury and Trauma (ExHIBIT), Public Health and Sport Sciences, University of Exeter, Exeter, UK.

Physiological Reports
|April 26, 2023
PubMed
Summary
This summary is machine-generated.

Heavy resistance exercise acutely alters dynamic cerebral autoregulation (dCA) 10 minutes post-exercise, specifically at a 0.10 Hz frequency. These changes in cerebral blood flow regulation recover within 45 minutes.

Keywords:
blood pressurecerebral blood flowcerebrovascularpressure-flow relationshipsquats

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Area of Science:

  • Physiology
  • Exercise Science
  • Neuroscience

Background:

  • Dynamic cerebral autoregulation (dCA) maintains stable cerebral blood flow (CBF) despite blood pressure (BP) fluctuations.
  • Heavy resistance exercise causes significant BP transients, potentially impacting dCA.
  • The time course of acute dCA alterations post-resistance exercise requires further quantification.

Purpose of the Study:

  • To quantify the time course of acute changes in dynamic cerebral autoregulation (dCA) following resistance exercise.
  • To investigate the frequency-specific alterations in dCA after a bout of resistance exercise.
  • To determine the recovery kinetics of dCA post-resistance exercise.

Main Methods:

  • Twenty-two healthy young adults participated in a resistance exercise trial and a resting control trial.
  • Dynamic cerebral autoregulation (dCA) was assessed using squat-stand maneuvers (SSM) at 0.05 Hz and 0.10 Hz.
  • Transfer function analysis of BP and middle cerebral artery blood velocity quantified dCA before, and 10 and 45 minutes after exercise.

Main Results:

  • Mean and systolic dCA gain, and normalized gain, were significantly elevated at 10 minutes post-resistance exercise during 0.10 Hz SSM.
  • These dCA alterations were frequency-specific (0.10 Hz only) and not observed at 0.05 Hz.
  • dCA metrics returned to baseline levels by 45 minutes post-exercise, indicating transient changes.

Conclusions:

  • Dynamic cerebral autoregulation (dCA) is acutely altered 10 minutes after resistance exercise, specifically at the 0.10 Hz frequency.
  • These findings suggest transient changes in sympathetic regulation of cerebral blood flow (CBF).
  • The observed alterations in dCA are temporary, with recovery occurring within 45 minutes post-exercise.