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Common procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.ommon procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.
During forced expiration, the internal intercostal muscles (excluding the interchondral part) contract and depress the rib cage. The abdominal muscles also aid expiration because, when they contract, they force abdominal organs up against the diaphragm and further decrease the volume of the thorax.By this means, the intrapulmonary pressure can rise 20 or 30 mmHg above the atmospheric pressure. The events that occur during inspiration.xpiration, aided by contraction of abdominal muscles and. such as the scalenes and sternocleidomastoid, internal intercostal muscles, increases intrapulmonary. decreases intrapulmonary pressure to -20 mmHg or. pressure to +30 mmHg or higher. lower. and expiration are summarized in table 16.2 and shown in figure 16.15.