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Updated: May 3, 2025
To express this idea in figures, let the expiratory or downward pull on the rib be said to involve the expenditure of five units of strength. According to the theory of opposed-action breath-control, this downward pull would have to be opposed by a slightly less upward pull, say four units of strength. Thus graphically presented, the fallacy of the "opposed-muscular" theory is clearly exposed.
Each of these systems of breath-control, opposed muscular action and ventricular, is in fact found on analysis to embody a misconception of scientific principles. Opposed-Action Breath-Control A curious misapprehension of mechanical processes is contained in the doctrine of breath-control by opposed muscular action.
In the opposed-action system of breath-control, the action of the rib-raising muscles is continued throughout the expiration, as a check upon the pull in the opposite direction of the rib-lowering muscles. Theoretically, the downward pull is "controlled" by the upward pull.
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