The following text is extracted from “The Cambridge Companion to Brass Instruments”
Edited by Trevor Herbert
The Open University, Milton Keynes, 1997
(ISBN-13: 9780521565226 | ISBN-10: 0521565227)
Reproduced here with the permission of Cambridge University Press.
The diaphragm (pages 201-203)
The diaphragm is the principal muscle of inspiration – of the drawing in of air, or inhalation. As with all muscles, contraction and relaxation of the diaphragm are controlled by nerves “wired” into it. When stimulated into a contraction, the diaphragm shrinks powerfully in its first phase of action, pulling its centre downwards, stretching the lungs down with it. Besides causing the lungs to expand, this displaces the contents of the abdomen below both downwards and forwards.
It is impossible to feel the diaphragm, but ballooning out the belly (without arching the lower back) is a good way of indirectly demonstrating its working, as there is no other muscle apart from the diaphragm which can cause this to happen. The size of the lungs, and thus the volume of air the contain, directly follows the expansion and contraction of the ribcage. In addition to the effects of the diaphragm acting on the ribcage, there are other muscles – the scalenes and the internal and external intercostal – which contribute to its expansion or contraction. None of these, however, are capable of expanding the lungs downwards; only the diaphragm can do this.
However, when it comes to expelling air, the most powerful and important group of muscles are the abdominal muscles. Unlike the diaphragm it is easy to feel the state of tension of the abdominal muscles with the fingers. Relaxing the belly, gently pushing the fingertips into it and giving a cough (pushing out the breath against the resistance of the glottis, and suddenly opening it) will demonstrate unquestionably that it is the contraction of abdominal muscle which propels the air out of the body.
There are some outwardly visible signs of good breathing technique. When the player takes a deep breath to play, the belly swells out to the front and sides (a little widening of the ribcage here is inevitable and should not be resisted). As the belly nears its maximum size the ribcage then becomes more involved, expanding outwards and upwards. During this, the sternum moves forwards and upwards, while the width of the ribcage, from one armpit to the other, increases. The shoulders lift slightly, pushed up from underneath by the ribcage, not pulled up by the should muscles above. Care must be taken not to raise them any more than the ribcage needs as this causes chronic shoulder tension.
The instinctive way of producing a perfectly co-ordinated, full and deep inspiration, which accomplished everything to do with the in-breath covered in this section and is immune to any interference by our conscious thoughts, is yawning.
It should be held in mind by all brass players, that developing good habits of breathing, or good habits in any aspect of instrumental technique, is a means to an end and not and end in itself.
Sep 21, 1997 | Categories: hornplaying, hornteaching, publications | Tags: abdomen, abdominal muscles, belly, breath, breathing, breathing technique, contraction, diaphragm, glottis, inhalation, inspiration, instr, lungs, muscle, relaxation, ribcage, shoulder tension, sternum, tension, volume of air, yawn, yawning | 1 Comment »