Can the abdominal muscles compress the stomach?

I was reading in Anatographica about how toning the abdominal muscles keeps the belly from sagging by holding the digestive organs in place. That got me thinking-if the abs receive a great deal of toning, can they hinder the digestive system by pushing against the stomach or other organs? Does the stomach have room to expand or do the various muscles find each other competing for limited abdominal space?