PMID: 7660333Mar 1, 1995

Software compensation for lung volume in assessment of inspiratory muscle strength and endurance

D K McKenzieJ B Leeper


To increase the sensitivity of measurements of maximal inspiratory pressure (MIP) as a test of inspiratory muscle strength and endurance, software was developed to correct for variation in lung volume. Using a body plethysmograph to determine absolute lung volume during each manoeuvre, values for MIP were expressed as a percentage of the pressure "expected" from the unfatigued MIP/lung volume relation in each subject. The method reduced the variance in peak and average pressure during a series of 18 MIP manoeuvres of 10 seconds duration separated by rest intervals of 10 seconds. The correlation between average pressure and contraction number was improved significantly by the MIP/lung volume correction. This simple correction has many applications in measurements of the MIP.


May 1, 1979·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·C RoussosP T Macklem
Sep 1, 1990·The Journal of Physiology·S C GandeviaB L Plassman
Mar 1, 1989·The American Review of Respiratory Disease·R D HubmayrS B Nelson
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Feb 1, 1988·The American Review of Respiratory Disease·K J DesmondA L Coates
Feb 1, 1987·Respiration Physiology·D K McKenzie, S C Gandevia
Oct 1, 1985·The Journal of Physiology·S C Gandevia, D K McKenzie
Jul 1, 1993·Respiration Physiology·G M AllenS Bass
Sep 1, 1964·Journal of Applied Physiology·C D COOKM M ORZALESI


Apr 14, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Babak MoradiEva Neubauer
Dec 9, 2003·American Journal of Speech-language Pathology·Heather M Clark
Apr 12, 2003·American Journal of Speech-language Pathology·Heather M ClarkMichael Sherrill
Jun 1, 1997·Journal of Applied Physiology·D K McKenzieS C Gandevia

Related Concepts

Inspiratory Capacity
Lung Volume Measurements
Maximal Voluntary Ventilation
Plethysmography, Whole Body
Respiratory Muscles
Signal Processing, Digital
Computer Programs and Programming
Respiratory Mechanics

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