The mechanical plant is propelled by the respiratorymuscles which serve as a mechanical pump. Normally,Pmus is sustained by the inspiratorymuscles (principally the diaphragmand, to a lesser extent, the externalintercostal and parasternal muscles). During hyperpnea or with increased expiratory load the expiratorymuscles may be recruited [Marroquin, 1991], as are accessory muscles which may contribute significantlyto the generation of Pmus in paraplegics
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