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Abstract
Balanced and unbalanced activities of the intrinsic laryngeal muscles have been studied on the same patients on the same day by three separate techniques: (1) identification of major muscle imbalance by correlation of history and laryngoscopic findings; (2) clinical voice testing; and (3) electromyography. Directly comparable results have been obtained. These results indicate that:
1. Healthy phonation basically is dependent on flexible balances of the interrelated sets of intrinsic laryngeal muscles.
2. Unhealthy phonation or vocal abuse was regularly identified with imbalance of these same intrinsic muscles.
3. Ratios of normal balances as well as imbalances in voice production are identifiable by the Clinical Voice Testing of (FBB).
4. It has been demonstrated that the amount of activity of these muscles required to produce voice sounds can be measured clinically both qualitatively and quantitatively even in a single intonation. This new technique has been termed Clinical Muscle Activity Assay.
5. In single intonations the electromyographically demonstrated ratio between resting and phonation amplitudes measured in microvolts was directly comparable with Clinical Muscle Activity Assay. Of 75 intonations so studied full positive statistical correlation was found.
6. This new technique of assay can be used as a research tool to measure accurately the amount of vocal abuse occurring in each instance of imbalanced muscle activity in any individual voice.
