Sustained preinspiratory cortical potentials during prolonged inspiratory threshold loading in humans.

Area of Science:

• Neuroscience
• Respiratory Physiology

Background:

• Voluntary control of breathing involves preparatory brain activity.
• Bereitschaftspotential (BP) on EEG precedes inspiration, indicating cortical involvement.
• BP presence during inspiratory loading suggests cortical adaptation to respiratory challenges.

Purpose of the Study:

• To investigate cortical involvement in sustained inspiratory loading.
• To determine if BP associated with respiratory control persists during prolonged mechanical load.

Main Methods:

• Nine healthy males underwent EEG and ventilatory monitoring.
• Participants experienced unloaded breathing and sustained inspiratory threshold loading (1 hour).
• EEG signals and respiratory variables were analyzed at the start and end of loading sessions.

Main Results:

• Sustained inspiratory loading induced persistent ventilatory changes.
• Bereitschaftspotential (BP) was frequently observed at both the beginning and end of the loading period.
• BP presence was noted in 6/9 participants with a 17-cmH2O load and 8/9 with a 23-cmH2O load.

Conclusions:

• The cerebral cortex is involved in compensating for sustained inspiratory loading.
• Cortical involvement in respiratory load compensation appears to be enduring, not transient.
• Further research is needed to understand implications for respiratory diseases with altered mechanics.