Not sure about this one. Don`t know much about it so I won`t get into a debate BUT I KNOW MY BODY and it`s not always because of a good workout.
I think it ahas A LOT to do with stretching the muscle rather than getting a good workout or not. Why do you get really sore triceps after doing overhead dumbell extensions and not sore biceps when doing dumbell curls, even if you used the same intensity with both? It`s because of the extreme stretch.
I`ve found over the years that #1 you don`t need to be sore to grow AND #2 being sore does`nt neccessarily mean you had a good workout, you may have just stretched the muscle.
Anyone agree with this?