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Related Experiment Video

Updated: Jan 9, 2026

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Optimizing cerebrovascular endothelial health through shear stress modulation.

Erika Iwamoto1, Rintaro Sakamoto2, Darren P Casey3,4,5

  • 1School of Health Sciences, Sapporo Medical University, Sapporo, Japan.

Experimental Physiology
|December 9, 2025
PubMed
Summary

Assessing cerebrovascular endothelial function using internal carotid artery flow-mediated dilation (ICA-FMD) requires precise methods. Moderate exercise improves ICA-FMD by increasing shear stress, suggesting a threshold stimulus is needed for vascular adaptation.

Keywords:
cerebral arteryendothelial functionexercisehypercapniaintermittent hypoxiainternal carotid artery

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Area of Science:

  • Cardiovascular research
  • Neurovascular function
  • Endothelial biology

Background:

  • Endothelial dysfunction is a key risk factor for cerebrovascular diseases.
  • Endothelial nitric oxide production is modulated by shear stress, impacting vascular adaptation.
  • Internal carotid artery flow-mediated dilation (ICA-FMD) is a valuable in vivo method for assessing human cerebrovascular endothelial function.

Purpose of the Study:

  • To review methodological advancements in ICA-FMD assessment.
  • To consolidate mechanistic insights for improving ICA-FMD.
  • To explore the impact of exercise on ICA-FMD and shear rate.

Main Methods:

  • Synthesis of methodological advances in ICA-FMD assessment, including CO2 inhalation and shear stress normalization.
  • Analysis of factors influencing ICA-FMD, such as intermittent hypoxia and exercise.
  • Investigation of ICA shear rate during different exercise intensities and types.

Main Results:

  • Standardized ICA-FMD assessment requires attention to CO2 levels, shear stress normalization, and ICA hemodynamics.
  • Intermittent hypoxia enhances ICA dilatory response by increasing shear stress.
  • Moderate-intensity leg cycling augments post-exercise ICA-FMD by increasing ICA shear rate, unlike high-intensity or small-muscle exercise.

Conclusions:

  • A threshold shear stimulus is likely necessary for exercise-induced improvements in ICA-FMD.
  • Standardized ICA-FMD methodologies and further research into shear stimulus thresholds are needed.
  • Optimizing cerebrovascular endothelial function through enhanced ICA-FMD holds potential for preventing cerebrovascular diseases.