Because the results of this work have strongly influenced me and because I find Miller's chapter on this subject so clear and straightforward, I shall be quoting from his forthcoming book in this article. The above cycle, which takes place during speaking, is contra-indicated for singing because of factors encountered in part 2. The appoggio makes it possible to keep the inhalation posture of the sternum and ribcage, which, in turn, does not allow the diaphragm to ascend so rapidly. As you will recall, this was the desired execution indicated by the European breath study. Neither physical exertion nor excessive energy produces skillful singing.
Diaphragmatic action is still a puzzle to the most knowledgeable of the vocal community.
The descent of the diaphragm is not directly controllable . The diaphragm does not descend so far down as most singers think. The diaphragm is passive during singing. Using the appoggio avoids the rib collapse of normal speaking. Appoggio singing retains the inspiratory posture of the sternum and ribcage, retarding the ascent of the diaphragm , by far the most important ingredient of the breath management mix.