Changes in the EEG spectrum at a two-week intensive endurance training

Area of Science:

• Sports Medicine
• Exercise Physiology
• Biochemistry

Background:

• Endurance training can lead to physiological changes in athletes.
• The 'pseudouremic syndrome of top athletes' is a condition observed in highly trained individuals.
• Understanding the impact of training on biochemical and neurological markers is crucial.

Purpose of the Study:

• To investigate the effects of a two-week endurance training program on marathon runners.
• To monitor biochemical parameters and electroencephalogram (EEG) changes during training.
• To evaluate the efficacy of a therapeutic intervention in mitigating training-induced syndromes.

Main Methods:

• Marathon runners underwent a two-week endurance training program.
• Biochemical parameters and EEG were analyzed at baseline, week one, and week two.
• A therapeutic intervention (reduced protein, increased glucose, Ca-lactate, fluids) was applied to a subset of runners in the second week.
• Fast spectral analysis was used for EEG processing.

Main Results:

• Biochemical markers indicated the development of a mild 'pseudouremic syndrome' after one week of training.
• The therapeutic intervention successfully eliminated the signs of pseudouremic syndrome in the treated group.
• EEG analysis revealed decreased theta activity and increased slow alpha and subtheta activity in both the intervention and control groups.
• No significant differences in EEG changes were observed between the intervened and control groups.

Conclusions:

• The therapeutic intervention effectively resolved the 'pseudouremic syndrome' in marathon runners.
• Observed EEG changes during intense training are likely related to fatigue and reduced central nervous system (CNS) substrate supply rather than the syndrome itself.
• Further research may be needed to fully elucidate the relationship between training load, biochemical changes, and CNS function.