Interactions between autonomic cardiovascular regulation and cortical activity: a CNV study

Area of Science:

• Neuroscience
• Cardiovascular Physiology
• Autonomic Nervous System Research

Background:

• Understanding the interplay between autonomic cardiovascular regulation and central nervous system activity is crucial.
• Previous research has explored links between physiological measures and brain function, but specific interactions require further elucidation.

Purpose of the Study:

• To investigate the relationship between autonomic cardiovascular regulation markers and cortical excitability in healthy individuals.
• To determine how baroreflex sensitivity (BRS) and respiratory sinus arrhythmia (RSA) relate to the contingent negative variation (CNV).

Main Methods:

• Assessed baroreflex sensitivity (BRS) and respiratory sinus arrhythmia (RSA) in 54 healthy participants under resting conditions.
• Induced contingent negative variation (CNV), an electroencephalography (EEG) marker of cortical excitability, using a reaction time task.
• Employed bivariate and multiple regression analyses to examine correlations between cardiovascular and cortical measures.

Main Results:

• Initially, only respiratory sinus arrhythmia (RSA) showed a moderate positive correlation with frontal contingent negative variation (CNV).
• After controlling for shared variance, baroreflex sensitivity (BRS) demonstrated an inverse association with the frontal CNV.
• A positive correlation persisted between RSA and the frontal CNV.

Conclusions:

• Baroreceptor afferents may exert bottom-up modulation on cortical excitability, as indicated by the inverse BRS-CNV relationship.
• The positive correlation between RSA and CNV might reflect interactions between prefrontal cortex activity and cardiac vagal tone.
• These findings highlight complex bidirectional communication between cardiovascular regulation and cortical processing.