Transfer function analysis of cerebral autoregulation dynamics during jaw movements

Area of Science:

• Neuroscience
• Physiology
• Cardiovascular Science

Background:

• Mastication (chewing) is a lifelong activity with potential benefits for cognitive function in aging populations.
• The impact of masticatory movements on cerebral circulation dynamics and autoregulation remains largely uninvestigated.

Purpose of the Study:

• To develop a system for monitoring circulatory dynamics during mastication.
• To investigate cerebral autoregulation during masticatory tasks in healthy adults.

Main Methods:

• Simultaneous recording of cerebral blood flow, heart rate, and arterial blood pressure.
• Quantitative evaluation of circulatory system changes during gum chewing.
• Transfer function analysis to assess cerebral autoregulation in response to blood pressure variations during mastication.

Main Results:

• Gum chewing led to increased cerebral blood flow, mean blood pressure, and heart rate, indicating activation of both cerebral and systemic circulation.
• Crucially, the observed increase in cerebral blood flow was independent of systemic circulatory changes.
• Transfer function analysis demonstrated robust cerebral autoregulation during masticatory activity.

Conclusions:

• Mastication activates cerebral circulation in a manner distinct from systemic circulatory responses.
• Cerebral autoregulation is effectively maintained during jaw movements, suggesting resilience of brain blood flow control.
• These findings contribute to understanding the physiological effects of mastication on brain health.