Rehabilitation Sciences Program, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Electrical Engineering Program, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Braz J Phys Ther. 2021 Nov-Dec;25(6):741-748. doi: 10.1016/j.bjpt.2021.04.012. Epub 2021 May 14.
Maximal respiratory pressures (MRP) obtained at functional residual capacity (FRC) may reflect the real respiratory muscle pressure.
To evaluate concurrent validity, test-retest, and inter-rater reliability of MRP performed with a new instrument in healthy individuals, and to compare values obtained at different volumes in healthy individuals and individuals with COPD.
MRP of 100 healthy individuals were obtained using the TrueForce and the MicroRPM® at residual volume (RV) and total lung capacity (TLC) to evaluate concurrent validity. MRP were obtained at FRC using the TrueForce to evaluate reliability. Comparisons of inspiratory pressure values (FRC compared to RV) and expiratory pressure values (FRC compared to TLC) were performed with 100 healthy individuals and 15 individuals with COPD.
The intraclass correlation coefficient (ICC) was 0.77 and 0.86 for concurrent validity for inspiratory and expiratory pressures, respectively. Test-retest reliability showed an ICC of 0.87 for inspiratory pressure, and 0.78 for expiratory pressure; inter-rater reliability showed an ICC of 0.91 for inspiratory pressure, and 0.84 for expiratory pressure. Measurements performed at RV and TLC were higher when compared to FRC [mean difference (95%CI)= -8.30 (-11.82, -4.78) cmHO; -37.29 (-42.63, -31.96) cmHO] in healthy individuals, and -11.09 (-15.83, -6.35) cmHO; -57.14 (-71.05, -43.05) cmHO in COPD, for inspiratory and expiratory pressures, respectively.
MRP performed with the TrueForce presented good concurrent validity, good test-retest reliability, excellent inter-rater reliability for inspiratory pressure and good inter-rater reliability for expiratory pressure. MRP were lower when obtained at FRC for healthy individuals and with COPD.
在功能残气量（FRC）下获得的最大呼吸压力（MRP）可能反映真实的呼吸肌压力。
评估新仪器在健康个体中测量 MRP 的同时效度、重测信度和组内信度，并比较健康个体和 COPD 患者在不同容量下获得的数值。
使用 TrueForce 和 MicroRPM®在残气量（RV）和肺总量（TLC）下对 100 名健康个体进行 MRP 测量，以评估同时效度。使用 TrueForce 在 FRC 下测量 MRP，以评估可靠性。对 100 名健康个体和 15 名 COPD 患者进行吸气压力值（FRC 与 RV 比较）和呼气压力值（FRC 与 TLC 比较）的比较。
吸气和呼气压力的组内相关系数（ICC）分别为 0.77 和 0.86，具有同时效度。重测信度显示吸气压力的 ICC 为 0.87，呼气压力的 ICC 为 0.78；组内信度显示吸气压力的 ICC 为 0.91，呼气压力的 ICC 为 0.84。与 FRC 相比，在健康个体中，RV 和 TLC 下的测量值更高[平均差值（95%CI）= -8.30（-11.82，-4.78）cmH2O；-37.29（-42.63，-31.96）cmH2O]，而在 COPD 患者中，吸气和呼气压力分别为-11.09（-15.83，-6.35）cmH2O；-57.14（-71.05，-43.05）cmH2O。
使用 TrueForce 进行的 MRP 具有良好的同时效度、良好的重测信度、吸气压力的优异组内信度和呼气压力的良好组内信度。在健康个体和 COPD 患者中，在 FRC 下测量时，MRP 较低。
