TW University Question: String Energy Return


I was looking at the string performance database, and it's quite a great tool you have put together!

My question regards the Energy return data:

Is the energy return figure testing performed when the string is totally fresh and before the full tension loss has occured? I am guessing that it is. I am very curious to know what the energy return percent is after the tension loss. My guess is that the energy return percent is significantly lower.