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That the glottis-closing muscles are too weak to withstand a powerful expiratory pressure is therefore an entirely erroneous statement. Owing to the small area of the under surfaces of the vocal cords, the air pressure against them is very small, in comparison with the total pressure exerted on the contents of the thorax by the expiratory contraction.
Obviously, this closure of the glottis cannot be effected by the contraction of the glottis-closing muscles, strictly speaking, for these muscles are too small and weak to withstand the powerful air pressure exerted against the vocal cords. The point of resistance is located just above the vocal cords.
The action of holding back the breath must not be performed by the muscles which close the glottis, for all the muscles of the larynx are very small and weak in comparison with the powerful muscles of expiration. The glottis-closing muscles are too weak to oppose their action to the force of a powerful expiration.
The glottis-closing muscles are fully capable of withstanding this comparatively slight pressure. The doctrine of breath-control is therefore scientifically untenable. This doctrine has no place in Vocal Science. As the basic doctrine of breath-control is unsound, the singer does not need any direct means for controlling the breath.
From these sensations he seems to have inferred that the glottis-closing muscles were too strongly contracted. This assumption was not warranted by any information conveyed in the sympathetic sensations.
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