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Triathlon training is defined less by any single session than by what carries over from one to the next. A swim fatigues the shoulders, a ride drains the legs, and the run that follows reveals whatever has not yet recovered. Supercompensation explains how adaptation is supposed to happen, but in triathlon, the window is often compressed. Red light therapy is now being studied as a way to influence that window, not by replacing recovery, but by helping the body move through it more efficiently.

Most runners assume progress happens during the run itself, in the miles logged and the effort sustained. In practice, it happens later, in the narrow window when the body is absorbing stress and rebuilding above baseline. That process is called supercompensation, and it helps explain why some runners adapt while others stay sore, stall, or slide into shin pain and knee trouble. Red and near-infrared light therapy is now being studied as a way to influence that recovery window, but its value depends on when it enters the cycle

Muscle soreness is often seen as a sign of progress, but not all soreness reflects adaptation. The difference between delayed-onset muscle soreness and chronic fatigue lies in how the body recovers and whether that process is functioning at all.

Cold water immersion, infrared heat, and red light therapy are often grouped together as recovery tools. In reality, they operate through fundamentally different biological mechanisms.

A growing body of research suggests that correctly timing red light therapy can change its physiological effects, shifting from performance support to recovery acceleration.