Update: Is exercise-induced oxidative stress a friend or foe?

Area of Science:

• Exercise Physiology
• Cellular Biology
• Biochemistry

Background:

• Muscular exercise elevates the production of free radicals and reactive oxygen species (ROS).
• Early research identified exercise-induced ROS as a cause of tissue oxidative damage.
• Recent findings highlight ROS's role as signaling molecules in exercise adaptations.

Purpose of the Study:

• To review the dual effects of exercise-induced ROS on cellular macromolecules.
• To analyze the adaptive responses mediated by ROS signaling in skeletal muscle.
• To conduct a risk/benefit analysis of exercise-induced ROS production.

Main Methods:

• Literature review of studies on exercise, oxidative stress, and redox signaling.
• Examination of damage to cellular macromolecules caused by exercise-induced ROS.
• Analysis of adaptive signaling pathways activated by ROS in contracting muscles.

Main Results:

• Exercise-induced ROS can lead to oxidative damage in muscles and other tissues.
• ROS produced during exercise also act as crucial signaling molecules.
• These signaling pathways promote beneficial adaptations like increased mitochondrial volume and antioxidant capacity.

Conclusions:

• Exercise-induced ROS present a dichotomy: potential damage versus beneficial signaling.
• Understanding this duality is key to optimizing exercise benefits and mitigating risks.
• A balanced perspective on ROS is essential for exercise science and health.