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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.
Respiratory muscles and their role in respiration. When we breathe in, air flows into the lungs down what is known as a âpressure gradientâ from an area of high pressure to an area of low pressure. The pressure gradient within the lungs is controlled by a muscle called the diaphragm.