Electroencephalographic correlates of paced breathing

Area of Science:

• Neuroscience
• Physiology
• Respiratory Regulation

Background:

• Paced breathing influences autonomic nervous system activity and brain oscillations.
• Understanding the impact of different breathing frequencies on cortical activity is crucial for applications in stress reduction and cognitive enhancement.

Purpose of the Study:

• To investigate the effects of paced breathing at various frequencies on electroencephalography (EEG) power bands (alpha, beta, theta) and cardiorespiratory variability.
• To determine how paced breathing influences cortical excitability and sensitivity.

Main Methods:

• Simultaneous recording of multichannel EEG, respiration, blood pressure, and ECG in 18 healthy subjects.
• Subjects performed paced breathing at five distinct frequencies, including eupneic (normal breathing) and slower rates.
• Analysis focused on power changes in alpha, beta, and theta EEG bands and the variability of cardiorespiratory parameters.

Main Results:

• Paced breathing at 0.25 Hz and 0.20 Hz led to increased mean beta band power and reduced low-frequency beta power variability.
• A significant decrease in total alpha power variability was observed in right parietal and occipital regions during 0.1 Hz paced breathing.
• These findings suggest frequency-dependent modulation of cortical activity by paced breathing.

Conclusions:

• Paced breathing at eupneic frequencies (0.25-0.20 Hz) is associated with heightened cortical excitability.
• Slower paced breathing (0.1 Hz) appears to diminish cortical sensitivity to external influences, potentially enhancing attentional states.
• Breathing exercises can be a non-invasive tool to modulate brain activity and cognitive function.