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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.
when the inspiratory muscles are relaxed, external forces distending the lungs no longer exist, therefore, stored energy is released and the lungs recoil to a smaller volume pulling inward on the ribs and thoracic wall. at the same time, the diaphragm returns to its rest position, pushing up on the lungs.