Redox Signaling in Skeletal Muscle: Why a Little Oxidative Stress Builds a Stronger Cell

When a muscle contracts repeatedly, it generates Reactive Oxygen Species (ROS). For much of the twentieth century this was read as straightforward wear and tear-oxidative damage that accumulated with exertion and required defending against. The modern understanding is almost the inverse: those contraction-induced ROS are not merely tolerated byproducts but indispensable messengers that instruct the muscle cell to remodel itself into a fitter, more resilient version. Understanding this molecular logic explains both why exercise works and why blunting it with antioxidants can backfire.