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Measurement of inspiratory muscle performance with incremental threshold loading
The American Review of Respiratory Disease
|April 1, 1987
Summary
Breathing strategies significantly impact sustainable inspiratory pressure (SIP) measurements. A new test using progressive inspiratory resistance shows reproducible results for assessing ventilatory muscle performance.
Area of Science:
- Respiratory Physiology
- Pulmonary Function Testing
Background:
- Sustainable inspiratory pressure (SIP) measurement is influenced by breathing strategies.
- Understanding ventilatory muscle performance is crucial for respiratory health.
Purpose of the Study:
- To investigate the effect of breathing strategies on SIP measurement.
- To develop and validate a new test for assessing ventilatory muscle performance.
Main Methods:
- Developed a progressive 2-minute incremental threshold inspiratory resistance test.
- Measured minute ventilation, oxygen consumption, PETCO2, and inspiratory mouth pressure.
- Assessed reproducibility and influence of breathing frequency.
Main Results:
- Maximum sustainable inspiratory pressure (SIPmax) was 46% greater than SIP after learning.
- Peak inspiratory mouth pressure (PmPeak) relative to maximum static inspiratory pressure (MIP) was reproducible.
- Optimal power output occurred at 55-75% of MIP.
Conclusions:
- Ventilatory muscle performance tests should accommodate breathing strategies for high inspiratory loads.
- The 2-minute incremental loading test is a simple, reproducible method for assessing ventilatory muscle performance with potential clinical applications.