Exercise is mitochondrial medicine for muscle.

Area of Science:

• Mitochondrial biology and exercise physiology.

Background:

• Mitochondria are crucial for muscle energy production.
• Mitochondrial dysfunction leads to reduced energy, increased oxidative stress, muscle atrophy, weakness, and decreased endurance.

Purpose of the Study:

• To review molecular evidence demonstrating exercise as a therapeutic countermeasure for mitochondrial dysfunction.
• To illustrate the complex and compensatory signaling pathways activated by exercise.

Main Methods:

• Review of molecular evidence on exercise and mitochondrial function.
• Analysis of signaling to transcription and post-transcriptional events in mitochondrial turnover.

Main Results:

• Exercise improves mitochondrial health and muscle function, even in the absence of key regulators of organelle biogenesis.
• Exercise initiates molecular signaling that enhances mitochondrial synthesis and degradation (turnover).

Conclusions:

• Exercise provides a medicinal effect on mitochondrial health and muscle function from the first bout of activity.
• Exercise-induced molecular signaling is complex and compensatory, effectively addressing mitochondrial dysfunction.