Acute effect of coffee drinking on dynamic cerebral autoregulation

Area of Science:

• Neuroscience
• Cardiovascular Physiology

Background:

• Coffee consumption induces physiological changes, including increased blood pressure and sympathetic activity.
• These alterations may influence cerebral vascular disease risk, but effects on dynamic cerebral blood flow (CBF) regulation are unclear.

Purpose of the Study:

• To investigate the impact of coffee consumption on dynamic cerebral blood flow (CBF) regulation.
• To test the hypothesis that coffee drinking enhances dynamic cerebral autoregulation.

Main Methods:

• Twelve healthy young subjects participated in a randomized, placebo-controlled study.
• Arterial blood pressure and middle cerebral artery blood velocity (MCAv) were measured continuously.
• Dynamic cerebral autoregulation was assessed using thigh cuff occlusion and release 30 minutes post-ingestion of coffee or water.

Main Results:

• Coffee intake led to increased mean arterial blood pressure and decreased mean MCAv.
• The rate of regulation (RoR), an index of dynamic cerebral autoregulation, was significantly higher after coffee consumption compared to placebo.
• These findings indicate coffee augments dynamic CBF regulation.

Conclusions:

• Coffee drinking enhances dynamic cerebral blood flow regulation, likely via cerebral vasoconstriction.
• This augmented regulation may contribute to a reduced risk of cerebral vascular disease.