If the radiation intensity is so low that the photodynamic effects of endogenous photosensitizers can not damage membrane or cell compartments, there would be photobiomodulation on delayed onset muscle soreness (DOMS) at the radiation dose chosen according to the biological information model of photobiomodulation since the intracellular proteolysis of damaged proteins by ubiquitin-proteasome pathway should be the key process for DOMS recovery.