Exercise’s hidden signal: how ROS orchestrate whole-body resilience

By Agewell Brief Editorial Desk · Published January 1, 2026 at 7:00 a.m. EST

Original reporting: Intracellular and extracellular redox signals during exercise and aging.

New review maps the precise redox choreography behind exercise benefits, revealing how muscle-generated oxidants travel via extracellular vesicles to fortify distant tissues—and why aging scrambles the signal.

Three things to remember

Exercise-induced ROS act as signaling molecules, not just damage agents.
Mitochondria and NADPH oxidases produce compartmentalized oxidant bursts.
Extracellular vesicles carry redox messages to distant organs.

Source

This signal is based on Intracellular and extracellular redox signals during exercise and aging. from PubMed. Read the original report for full context.

Health note: Review article; mechanisms inferred from animal models, not yet proven in humans.

Pioneer Lineage · Historical Precursors

Scientific Precursors & Foundational Discoveries

1985 Helmut Sies

Coined the term 'oxidative stress' and established the concept of redox homeostasis, distinguishing between low-level physiological oxidants (eustress) that regulate signaling and excessive oxidants (distress) that cause damage. This framework directly underpins the review's central theme of exercise-induced ROS as beneficial modulators of redox-sensitive pathways, and its emphasis on the context-dependent nature of oxidative eustress versus distress.

2000 Toren Finkel

Demonstrated that reactive oxygen species (ROS) act as second messengers in cellular signaling, particularly through the reversible oxidation of cysteine residues in proteins such as phosphatases and kinases. This work established the mechanistic basis for how ROS generated during exercise can modulate intracellular signaling cascades, validating the review's focus on compartmentalized ROS production (mitochondrial and NADPH oxidase) and its role in initiating adaptive responses in skeletal muscle.

Three things to remember

Source

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