About 100 years ago, Morrell Mackenzie made the following statement: "A singer's thyro-arytenodei should be in as good condition as a pugilist's biceps." No one familiar with the physiology of the larynx could possibly take exception to this remark, for the thyroarytenoid muscles are the most important factors of the whole tone-producing mechanism.
It is, however, one thing to accept a theory and something very different when the attempt is made to put it into practice. And it is with the utter failure to profit by this succinct statement and to supply singers and speakers with the means whereby they can strengthen these muscles that I am deeply concerned.
The principle of muscular development is that of contraction and relaxation. Therefore, in order to develop the thyroarytenoids there must be contraction and relaxation. These muscles are chiefly concerned with the production of pitch; not only do they bring about the
ZERFFI WAC. Vocal Muscular Development. AMA Arch Otolaryngol. 1955;62(4):406–408. doi:10.1001/archotol.1955.03830040060010
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