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Concurrent validity of the static and dynamic measures of inspiratory muscle strength: comparison between maximal inspiratory pressure and s-index
Areias, Guilherme de Souza; Santiago, Luan Rodrigues; Teixeira, Daniel Sobral; Reis, Michel Silva.
  • Areias, Guilherme de Souza; Universidade Federal do Rio de Janeiro. Programa de Pós-Graduação em Educação Física e Desportos. Rio de Janeiro. BR
  • Santiago, Luan Rodrigues; Universidade Federal do Rio de Janeiro. Programa de Pós-Graduação em Educação Física e Desportos. Rio de Janeiro. BR
  • Teixeira, Daniel Sobral; Universidade Federal do Rio de Janeiro. Programa de Pós-Graduação em Educação Física e Desportos. Rio de Janeiro. BR
  • Reis, Michel Silva; Universidade Federal do Rio de Janeiro. Programa de Pós-Graduação em Educação Física e Desportos. Rio de Janeiro. BR
Rev. bras. cir. cardiovasc ; 35(4): 459-464, July-Aug. 2020. tab, graf
Article in English | LILACS, SES-SP | ID: biblio-1137286
ABSTRACT
Abstract

Objective:

To verify the concurrent validity between the inspiratory muscle strength (IMS) values obtained in static (maximal inspiratory pressure [MIP]) and dynamic (S-Index) assessments.

Methods:

Healthy individuals were submitted to two periods of evaluation i) MIP, static maneuver to obtain IMS, determined by the Mueller's maneuver from residual volume (RV) until total lung capacity (TLC); ii) and S-Index, inspiration against open airway starting from RV until TLC. Both measures were performed by the same evaluator and the subjects received the same instructions. Isolated maneuvers with differences < 10% were considered as reproducible measures.

Results:

Data from 45 subjects (21 males) were analyzed and that showed statistical difference between MIP and S-Index values (133.5 ± 33.3 and 125.6 ± 32.2 in cmH2O, respectively), with P=0.014. Linear regression showed r2=0.54 and S-Index prediction formula = 39.8+(0.75×MIP). Pearson's correlation demonstrated a strong and significant association between the measures with r=0.74. The measurements showed good concordance evidenced by the Bland-Altman test.

Conclusion:

S-Index and MIP do not present similar values since they are evaluations of different events of the muscular contraction. However, they have a strong correlation and good agreement, which indicate that both are able to evaluate the IMS of healthy individuals.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Respiratory Muscles / Maximal Respiratory Pressures Type of study: Prognostic study Limits: Female / Humans / Male Language: English Journal: Rev. bras. cir. cardiovasc Year: 2020 Type: Article Institution/Affiliation country: Universidade Federal do Rio de Janeiro/BR

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Full text: Available Index: LILACS (Americas) Main subject: Respiratory Muscles / Maximal Respiratory Pressures Type of study: Prognostic study Limits: Female / Humans / Male Language: English Journal: Rev. bras. cir. cardiovasc Year: 2020 Type: Article Institution/Affiliation country: Universidade Federal do Rio de Janeiro/BR