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Assessment of Maximum Dynamic Inspiratory Pressure
Paulo Eugênio Silva1,2, Karina Livino de Carvalho3, Murillo Frazão4
1Physical Therapy Division, University Hospital of Brasília, Brasília, Brazil, and Health Sciences and Technologies PhD Program, University of Brasília, Brazil. pauloeugenio.bsb@gmail.com.
Respiratory Care
|July 19, 2018
Summary
Eight maneuvers are needed to reliably measure maximum inspiratory pressure (S-Index). Inspiratory muscle warm-up significantly enhances S-Index performance, indicating improved ventilatory capacity.
Area of Science:
- Respiratory Physiology
- Pulmonary Function Testing
Background:
- Inspiratory muscle strength is a key indicator of ventilatory capacity and overall physical performance.
- The S-Index offers a novel method for dynamic evaluation of maximum inspiratory pressure.
- Optimal protocols for S-Index assessment require further investigation.
Purpose of the Study:
- To determine the number of inspiratory maneuvers required for a stable and reliable S-Index measurement.
- To evaluate the effect of inspiratory muscle warm-up on S-Index values.
Main Methods:
- Retrospective analysis of S-Index test data from 81 healthy subjects.
- Comparison of S-Index values with and without inspiratory muscle warm-up or sham.
- Statistical analysis using intraclass correlation coefficient and unpaired t-test.
Main Results:
- A maximum and reliable S-Index was achieved by the eighth maneuver in both warm-up and sham groups (102 cm H2O, ICC=0.96).
- The inspiratory muscle warm-up group showed a significant S-Index increase of 13.5 cm H2O post-warm-up (P < .001).
Conclusions:
- Eight maneuvers are essential for obtaining maximum and reliable S-Index measurements.
- Pre-assessment inspiratory muscle warm-up demonstrably improves inspiratory muscle performance and S-Index values.
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