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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.
The intraplural pressure becomes more negative simply because as the inspriatory muscles (diaphragm, external intercostals) act to increase thoracic volume, the intrapleural s â¦ pace increases in volume somewhat, thereby decreasing the pressure (Boyle's Law).he intraplural pressure becomes more negative simply because as the inspriatory muscles (diaphragm, external intercostals) act to increase thoracic volume, the intrapleural s â¦ pace increases in volume somewhat, thereby decreasing the pressure (Boyle's Law).