EEG-Metabolic Coupling and Time Limit at V˙O₂max During Constant-Load Exercise.

Area of Science:

• Neuroscience
• Exercise Physiology
• Sports Science

Background:

• Exercise duration at maximum oxygen uptake (V˙O₂max) is influenced by metabolic factors and brain-ventilation interplay.
• Cortical activity (EEG) and its relation to performance and fatigue regulation during constant-load cycling require examination.

Purpose of the Study:

• To investigate the association between electroencephalography (EEG) oscillatory activity and endurance capacity during high-intensity exercise.
• To explore the relationship between brain dynamics, ventilatory regulation, and acute fatigue during a cycling test to exhaustion.

Main Methods:

• Thirty trained participants completed a constant-load cycling test at 90% maximal aerobic power until exhaustion.
• Continuous electroencephalography (EEG) and gas exchange measurements were recorded.
• Ratings of perceived exertion were collected post-exercise.

Main Results:

• Beta power negatively correlated with time spent at V˙O₂max, suggesting neural strain.
• EEG-metabolic ratios (e.g., Alpha/V˙O₂, Theta/V˙CO₂) showed significant correlations with time to reach V˙O₂max, time spent at V˙O₂max, and time to exhaustion.
• Theta and Alpha bands, when normalized to metabolic load, were linked to ventilatory coordination and motor control.

Conclusions:

• Cortical oscillations are associated with distinct aspects of acute fatigue regulation during exercise.
• EEG-metabolic ratios may serve as indicators of brain-metabolism interaction during high-intensity exercise.
• Findings suggest potential for guiding brain-body interactions to enhance endurance performance.