Red Light Therapy Before or After Workouts — Which Is Better?

Timing of red light therapy relative to exercise is one of the most debated questions in the photobiomodulation literature — and the answer is nuanced. The research supports both pre and post-workout use, but they produce different effects depending on what you are trying to achieve.

Pre-Workout Red Light: Performance Enhancement

Research on pre-workout red light therapy suggests it may reduce the metabolic stress of exercise — meaning you produce the same training stimulus with less cellular damage. A 2020 study in the Journal of Athletic Training found that red light therapy applied 20 minutes before training reduced markers of muscle damage and improved subsequent performance in a second session later the same day. This suggests a priming effect.

Post-Workout Red Light: Recovery Acceleration

The majority of research supports post-workout application as the primary protocol for athletes focused on recovery. Red light applied within 2 hours after training accelerates the clearance of metabolic waste products (lactate, hydrogen ions), reduces the inflammatory response that causes DOMS, and jumpstarts the muscle protein synthesis that drives adaptation.

The Evidence-Based Recommendation

For athletes focused on maximising recovery: post-workout is the priority — apply immediately after training. For athletes competing multiple times per day: pre-workout can be used to reduce fatigue accumulation. For general wellness and sleep: evening sessions are most effective. The optimal approach combines post-workout recovery with evening sleep-support sessions.

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