I've not heard that Maria. Thinking logically, if exercise (some sort of resistance training) works because it tears muscle fibres which then are dealt with naturally with an inflammatory response, I guess you wouldn't want to time your red/NIR exposure on that spot - because red/NIR is supposed to decrease inflammatory responses. But, that's just a hypothesis. For sure, in my experience, red/NIR exposure is great for injuries - reducing pain as well as inflammation and speeding up healing.