Abstract
Summary The relevance of breathing behavior to phonation is poorly understood in voice science but is heavily emphasized in voice pedagogy. A possibly important factor in this relationship is the consequence of the downward tracheal pull on the larynx. This pull is mainly dependent on the positioning of the diaphragm in the body trunk, and it can thus be influenced by diaphragm muscle contraction. An experiment was carried out to investigate the relationship between diaphragmatic coactivation during singing and the electromyographic (EMG) activity in the cricothyroid (CT) muscles. In three well-trained baritone singers a higher CT EMG activity was observed during phonation under conditions of a low diaphragm, induced either by a high lung volume or a coactivation of the diaphragm during singing. The cause of this relationship is discussed.
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