Altered oxidative stress in overtrained athletes

Area of Science:

• Exercise Physiology
• Biochemistry

Background:

• Overtraining syndrome (OTS) is a complex condition affecting athletes.
• Oxidative stress is implicated in various physiological dysregulations.

Purpose of the Study:

• To investigate the relationship between oxidative stress markers and overtraining syndrome.
• To assess antioxidant status in overtrained versus control athletes.

Main Methods:

• Measured plasma oxidative stress indicators (protein carbonyls, nitrotyrosine, malondialdehyde) and antioxidant capacity (ORAC).
• Compared severely overtrained athletes and control athletes at baseline and after 6 months of recovery.
• Assessed samples at rest and post-exhaustive exercise.

Main Results:

• Overtrained athletes exhibited higher resting plasma protein carbonyls at baseline.
• Exercise induced increases in ORAC and malondialdehyde in controls, but not in overtrained athletes.
• Overtrained athletes showed negative correlations between resting ORAC and post-exercise protein carbonyls.

Conclusions:

• Elevated oxidative stress plays a role in the pathophysiology of overtraining syndrome.
• Blunted exercise-induced oxidative stress and antioxidant responses may contribute to impaired exercise performance and adaptation in OTS.