RT Journal Article SR Electronic T1 Assessment of Maximum Dynamic Inspiratory Pressure JF Respiratory Care FD American Association for Respiratory Care SP 1231 OP 1238 DO 10.4187/respcare.06058 VO 63 IS 10 A1 Paulo Eugênio Silva A1 Karina Livino de Carvalho A1 Murillo Frazão A1 Vinicius Maldaner A1 Carlos Raphael Daniel A1 Mansueto Gomes-Neto YR 2018 UL http://rc.rcjournal.com/content/63/10/1231.abstract AB BACKGROUND: Inspiratory muscle strength has been considered an important marker of ventilatory capacity and a predictor of global performance. A new tool has become available for dynamically evaluating the maximum inspiratory pressure (the S-Index). However, the proper assessment of this parameter needs to be determined. Thus, the aim of the present study was to investigate the number of inspiratory maneuvers necessary to reach a maximum and reliable S-Index and the influence of inspiratory muscle warm-up on this assessment.METHOD: We performed a retrospective study from the database of 432 healthy subjects who underwent S-Index tests and inspiratory muscle warm-up or sham. The effect of repeated maneuvers on the S-Index and the impact of inspiratory muscle warm-up were analyzed by using the intraclass correlation coefficient and unpaired t test.RESULTS: We analyzed 81 subjects, (55% men), mean ± SD age 38.1 ± 9.6 y, 43 subjects in the inspiratory muscle warm-up group. Maximum and reliable S-Indexes were reached at the eighth maneuver in both groups preceding inspiratory muscle warm-up or sham, 102 cm H2O (95% CI 95–109 cm H2O); intraclass correlation coefficient 0.96; P < .001. Only the inspiratory muscle warm-up group presented a significant increase in the S-Index after warm-up, 13.5 cm H2O (95% CI 10–17), P < .001.CONCLUSIONS: Eight maneuvers were necessary to reach maximum and reliable values of the S-Index preceding inspiratory muscle warm-up or sham. Moreover, inspiratory muscle warm-up preceding S-Index assessment improved inspiratory muscle performance.