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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
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New Protocol for Evaluating Maximum Inspiratory Pressure: Concurrent Validity and Test-Retest Reliability.

Ibai López-de-Uralde-Villanueva1, Raúl Fabero-Garrido1, Elena Alonso Rodríguez de Rivera2

  • 1Department of Radiology, Rehabilitation and Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Complutense University of Madrid, Madrid, Spain.

Physical Therapy
|September 3, 2024
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Summary

A new maximum inspiratory pressure (MIP) test protocol, based on the 1-repetition maximum (1RM) principles, is validated for individuals with chronic obstructive pulmonary disease (COPD). This reliable test aids in prescribing inspiratory muscle training (IMT) for better patient care.

Keywords:
Chronic Obstructive Pulmonary DiseaseMaximal Respiratory PressuresMuscle StrengthPatient Outcome AssessmentReproducibility of Results

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Area of Science:

  • Pulmonary Rehabilitation
  • Respiratory Muscle Strength Testing

Background:

  • Chronic obstructive pulmonary disease (COPD) necessitates effective methods for assessing respiratory muscle strength.
  • Current maximum inspiratory pressure (MIP) testing protocols may lack simplicity and feasibility for widespread clinical application.
  • The 1-repetition maximum (1RM) testing principle offers a potential framework for a more robust MIP assessment.

Purpose of the Study:

  • To validate a novel MIP test protocol adapted from 1RM principles.
  • To evaluate the test-retest reliability of this new MIP protocol.
  • To determine the minimal detectable change (MDC) for MIP in individuals with COPD.

Main Methods:

  • A 1RM-based incremental protocol was developed for MIP testing using a threshold valve device.
  • Forty-nine individuals with COPD participated, with 44 completing two test sessions 7-10 days apart.
  • Concurrent validity was assessed against a digital manometer (reference test).

Main Results:

  • The 1RM-based MIP protocol demonstrated good concurrent validity (ICC=0.81-0.85) against the reference test.
  • Excellent test-retest reliability was observed (ICC=0.92).
  • The standard error of measurement was 6.3 cm H2O, with an MDC of 17.5 cm H2O.

Conclusions:

  • A new 1RM-based MIP test protocol is validated for COPD patients, showing good concurrent validity and excellent reliability.
  • The established MDC provides a clinically meaningful threshold for detecting changes in MIP.
  • This validated protocol supports appropriate prescription of inspiratory muscle training (IMT), potentially improving physical therapist care for COPD.