Cortical processing of breathing perceptions in the athletic brain.

Area of Science:

• Neuroscience
• Exercise Physiology
• Respiratory Medicine

Background:

• Athletes experience significant increases in ventilation and breathlessness during exercise.
• Breathlessness perception often poorly correlates with lung function in healthy and clinical populations.
• Endurance athletes show a closer match between subjective breathlessness and ventilation changes, indicating superior respiratory interoception.

Purpose of the Study:

• To investigate the neural mechanisms underlying optimized respiratory perception in athletes.
• To understand how the brain processes breathlessness anticipation and perception in relation to exercise.

Main Methods:

• Utilized 7 Tesla functional magnetic resonance imaging (fMRI) in 20 endurance athletes and 20 sedentary controls.
• Applied inspiratory resistive loading to induce breathlessness and a delay-conditioning paradigm for breathlessness anticipation.
• Analyzed brain activity and functional connectivity within interoceptive and sensorimotor networks.

Main Results:

• Athletes displayed anticipatory brain activity in interoceptive areas (thalamus, insula, sensorimotor cortex) positively correlated with breathlessness perception.
• Sedentary controls showed a negative correlation between anticipatory brain activity and breathlessness perception.
• Athletes exhibited altered connectivity between interoceptive attention networks and the primary sensorimotor cortex.

Conclusions:

• Exercise, specifically endurance training, appears to optimize the brain's processing of respiratory sensations.
• Altered functional brain activity and connectivity in athletes suggest enhanced anticipatory representations of breathlessness.
• These findings may inform therapeutic strategies using exercise to manage breathlessness in chronic respiratory diseases.