Cerebrovascular Function in the Large Arteries Is Maintained Following Moderate Intensity Exercise
Jessica J Steventon1,2, Alex B Hansen3, Joseph R Whittaker2
1Neuroscience and Mental Health Research Institute, School of Medicine, Cardiff University, Cardiff, United Kingdom.
Frontiers in Physiology
|December 7, 2018
Summary
Moderate exercise temporarily increases cerebral blood flow velocity, but this effect is primarily due to changes in CO2 levels, not a direct vascular response. Post-exercise, cerebral blood flow and reactivity return to normal quickly.
Area of Science:
- Physiology
- Neuroscience
- Cardiovascular Science
Background:
- Exercise influences cerebrovascular adaptations, but temporal dynamics and regional variations remain unclear.
- Understanding the immediate post-exercise cerebrovascular response is crucial for assessing its physiological impact.
Purpose of the Study:
- To investigate the immediate cerebrovascular effects of a single moderate-intensity exercise session.
- To measure changes in cerebral blood flow velocity (CBFV) and cerebrovascular reactivity (CVR) in the hour following exercise cessation.
Main Methods:
- Transcranial Doppler (TCD) ultrasonography measured CBFV in middle (MCAv) and posterior cerebral arteries (PCAv).
- Duplex ultrasound assessed cerebral blood flow (CBF) in internal carotid (ICA) and vertebral arteries (VA).
- Hypercapnia challenges evaluated cerebrovascular reactivity (CVR) pre- and post-exercise.
Main Results:
- CBFV in MCAv and PCAv significantly increased during exercise, primarily attributed to end-tidal CO2 variations.
- No significant exercise-induced effects on CBFV or CVR were observed in intracranial or extracranial arteries post-exercise.
- Cerebrovascular reactivity remained unchanged after the exercise bout.
Conclusions:
- The immediate post-exercise period shows rapid and uniform regulation of cerebral blood flow in healthy young males.
- Changes in cerebral blood flow during exercise are mainly driven by respiratory CO2 levels, not direct vascular alterations.
- Exercise cessation leads to a swift normalization of cerebral hemodynamics.
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