Respiratory Mechanics by Theodore A. Wilson

Author:Theodore A. Wilson
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

2.3.1 Respiratory Effect

The muscles of the diaphragm shorten by 30–35 % with passive lung inflation from FRC to TLC [19, 21, 23]. For a 24 kg dog, therefore, . Muscle mass is 95 g [24], and the maximum respiratory effect of the diaphragm is . The proportionality between level of activation and mechanical advantage, described above, applies within each muscle group, but not across groups. In the dog, the mechanical advantage of the diaphragm is twice that of the parasternals, but the level of activation of the diaphragm during spontaneous breathing is always less than maximum [25] whereas the level of activation of the parasternals during vigorous inspiratory efforts approaches 100 %. Thus, it appears that the mass of the diaphragm has been set by other functions.

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