Maximal Inspiratory and Maximal Expiratory Pressures

 

Maximal Inspiratory Pressure (cm H2O)

 

predicted maximal inspiratory pressure, in cm of water for males 20 - 80 years old =

= 143 - (0.55 * (age in years))

 

predicted maximal inspiratory pressure, in cm of water for males 20 - 54 years old =

= 129 - (0.13 * (age in years))

 

predicted maximal inspiratory pressure, in cm of water for males 44 - 80 years old =

= 120 - (0.25 * (age in years))

 

predicted maximal inspiratory pressure, in cm of water for females 20 - 86 years old =

= 104 - (0.51 * (age in years))

 

predicted maximal inspiratory pressure, in cm of water for females 20 - 54 years old =

= 100 - (0.39 * (age in years))

 

predicted maximal inspiratory pressure, in cm of water for females 55 - 86 years old =

= 122 - (0.79 * (age in years))

 

Maximal Expiratory Pressure (cm H2O)

 

predicted maximal expiratory pressure, in cm of water for males 20 - 80 years old =

= 268 - (1.03 * (age in years))

 

predicted maximal expiratory pressure, in cm of water for males 20 - 54 years old =

= 229 + (0.08 * (age in years))

 

predicted maximal expiratory pressure, in cm of water for males 54 - 80 years old =

= 353 - (2.33 * (age in years))

 

predicted maximal expiratory pressure, in cm of water for females 20 - 86 years old =

= 170 - (0.53 * (age in years))

 

predicted maximal expiratory pressure, in cm of water for females 20 - 54 years old =

= 158 - (0.18 * (age in years))

 

predicted maximal expiratory pressure, in cm of water for females 55 - 86 years old =

= 210 - (1.14 * (age in years))

	maximal inspiratory pressure	maximal expiratory pressure
poor effort	decreased	decreased
fatigue	decreased	decreased
neuromuscular disease	decreased	decreased
increased lung volume	decreased	normal
decreased lung volume	normal	decreased