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Related Experiment Videos

Maximal inspiratory pressure: does reproducibility indicate full effort?

T K Aldrich1, P Spiro

  • 1Pulmonary Medicine Division, Montefiore Medical Center, Bronx, New York.

Thorax
|January 1, 1995
PubMed
Summary

Reproducibility of maximal inspiratory pressure (MIP) tests is not a reliable indicator of maximal effort. This study found no clear difference between maximal and submaximal efforts, questioning MIP validity for assessing inspiratory muscle strength.

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Area of Science:

  • Pulmonary Physiology
  • Respiratory Muscle Function

Background:

  • Maximal inspiratory pressure (MIP) is commonly used to assess inspiratory muscle strength.
  • Reproducibility of MIP measurements is often assumed to reflect maximal effort.

Purpose of the Study:

  • To investigate if the reproducibility of MIP measurements is a valid indicator of maximal effort.
  • To determine the reliability of MIP as a measure of inspiratory muscle strength.

Main Methods:

  • Ten healthy subjects familiar with MIP testing performed nine maximal and nine submaximal efforts.
  • Peak negative inspiratory pressure (Pmax), coefficients of variation, and ranges of the best three efforts were calculated for both maximal and submaximal trials.

Main Results:

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  • No significant difference was observed in the coefficients of variation or ranges between maximal and submaximal MIP efforts.
  • In some cases, submaximal efforts exhibited better reproducibility (smaller ranges) than maximal efforts, challenging established validation criteria.

    • Conclusions:

    • Reproducibility should not be solely relied upon to validate MIP tests, particularly in research settings.
    • The findings question the utility of MIP reproducibility for accurately discriminating small changes in inspiratory muscle strength.