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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.
Intrapleural pressure is the pressure within the pleural space. Due to the elastic forces of the lung (tending to contract) and the chest wall (tending to expand) under normal conditions Pip is negative. The magnitude of Pip varies with each phase of ventilation.