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Can you explain what you mean in should I say more down to Earth, less physics terminology? I understand that you're suggesting there should be another test done for further investigation, but what exactly do you mean is going on mechnically? One observation which has been noted and at this point a well known phenomenon which I caused myself with my own mind by resisting defecation for an extended period of time due to a fissure in 2005 is the more I strain, the tighter the anal canal becomes. If one were to insert his/her finger in to it, and I pushed, that canal would wrap itself around the finger very tightly, so it makes perfect sense why no barium could be released as I was pushing. The canal was sealing itself up. It's the same thing which happens when they ask me to expel a balloon. These experts down at Temple University Hospital in Philadelphia know that it will tighten if I push, so how do they expect me to be able to push a balloon out? I'm pretty sure that's why no barium contrast comes out. It's exactly the same reason. The only way stool can be released from my body is if it's loose and effortless basically because of the high tone of the external anal sphincter. It's tight enough at rest as it is and tightens up a lot more if I push. So again my question really is what is mechanically going on. Can you try to explain one more time? You seem to understand this quite well yourself.