So I read a book from Dr. J.D Swanson "Karate Science: Dynamic Movement" about a year ago. He's got lots of interesting material that breaks down aspects of the mechanics of karate (in a shotokan style). I don't necessarily agree with everything in that book, but the vast majority of it is useful. One of consistently mentioned topics in that book is intra-abdonimal pressure (IAP) and how it can be implimented to increase power through compression and connection between your abdominal area, your core structure, the floor, and your target.
My question is, if anyone else has experience trying to work IAP into their technqiue. Please note, I'm not just talking about core compressing/tightening, but the technique of using air pressure to briefly hold a strengthened internal core structure for the purposes of kinnetic linkage.
I have a singing background and have spent a lot of time learning how to use my diaphram for air pressure but never thought about using that for karate. My experience leads me to believe that creating IAP works best (and is typically referred to) when inhaling. What Swanson talks about is using IAP as part of creating kime, exhaling, for just the moment of impact- which makes sense, but the idea that you use it when exhaling is hard to grasp, let alone practice for generating more kime.
Since implimenting this technique, I've tried my best to always inhale focusing on IAP, and use the residual pressure and core muscle activation in order to create a better connection and kime. Is this wrong? Am I missing something here?