Novos valores de referência para pressões respiratórias máximas na população brasileira

Abstract

Objective: To compare MIP and MEP determined in healthy subjects with those predicted using the equations proposed in another study, and, if necessary, to suggest new equations for MIP and MEP to be used in the Brazilian population. Methods: The study sample comprised 60 healthy males and 60 healthy females, 20-80 years of age (20 subjects per ten-year age bracket). Maximal respiratory pressures were determined following a standardized protocol. Results: Regarding MIP, the measured values were significantly lower than those predicted for both males (31%) and females (24%). There were no significant differences between measured and predicted MEP in either gender. We found that age presented the greatest power to predict MIP and MEP in both genders. New equations were proposed. Conclusions: The previously proposed equations were unable to predict MIP and MEP for all of the subjects in our sample. Therefore, the results of this study can facilitate the prediction of respiratory muscle strength in healthy adult subjects in Brazil. Further studies, involving subjects from different regions of the country, could lead to the development of better tables or equations for maximal respiratory pressures in the Brazilian population. ResumoObjetivo: Comparar PImáx e PEmáx medidas em indivíduos saudáveis com os valores previstos utilizando-se as equações propostas em outro estudo e, se necessário, sugerir novas equações para PImáx e PEmáx para a população brasileira. Métodos: Participaram do estudo 60 homens e 60 mulheres saudáveis com idades entre 20 e 80 anos (20 indivíduos por faixa etária de 10 anos). As pressões respiratórias máximas foram determinadas segundo um protocolo padronizado. Resultados: Os valores medidos de PImáx foram significativamente menores que aqueles previstos tanto para homens (31%) e mulheres (24%). Não houve diferenças significativas entre a PEmáx medida e prevista nos dois gêneros. A idade provou ser a variável com melhor poder preditivo para PImáx e PEmáx nos dois gêneros. Novas equações foram propostas. Conclusões: As equações propostas no estudo prévio não foram capazes de predizer PImáx e PEmáx de todos os indivíduos de nossa amostra. Portanto, os resultados deste estudo podem facilitar a predição da força muscular respiratória de adultos saudáveis no Brasil. Novos estudos, com indivíduos de diferentes regiões do país, poderão contribuir para o desenvolvimento de melhores tabelas ou equações para as pressões respiratórias máximas na população brasileira. MethodsThe study sample comprised 120 healthy subjects (60 males and 60 females), 20-80 years of age, residing in the city of São Carlos, located in the state of São Paulo, Brazil. Each of the six ten-year age brackets used in the study included 10 male and 10 female subjects.The volunteers were selected according to the criteria of having a BMI between 18.0 and 29.5 kg/m 2(8) and being a nonsmoker. Subjects with a history of respiratory or cardiovascular disease were excluded, as were those with any neuromuscular disease that would p...

Predictive Equations for Maximum Respiratory Pressures of Women According to Body Mass

“…[4][5][6] In this study, the variables age and height showed no correlations with the maximum respiratory pressures; thus, they were not included in the linear regression model. This may have been due to the homogeneity of the groups with regard to these variables, unlike in the studies of Black and Hyatt, 10 Neder et al, 11 , Costa et al, 12 and Simões et al, 13 in which these variables showed a negative predictive importance for maximum respiratory pressures. One explanation for this may be the differences in age between the samples, which ranged from 20 to 86 y.…”

“…Several authors [10][11][12] have determined reference values by means of equations considering sex and age. In a study of healthy sedentary individuals between 20 and 89 y old, Simões et al 13 investigated the relationship of maximum respiratory pressures with age, height, and body mass and proposed predictive equations.…”

Respiratory muscle strength of Brazilian adolescents: obtained and predicted values

“…During the last years, several studies have comparatively analyzed maximal respiratory pressures and highlighted the discrepancies observed between found and predicted values in different age groups 7,[9][10][11] . Such fact has been attributed to methodological differences, to the quantity and quality of samples evaluated, to equipments and techniques used, besides geographical, social and anthropometric differences of the individuals 9 .…”

“…With regard to technique's aspects, it is argued that the use of a nose clip and a flanged mouthpiece contribute to reduce the risks of air escape and consequently avoid the under estimation of the real values measured for maximal respiratory pressures 10 . This aspect may justify the possible underestimation of the obtained values by the study of Wilson et al 6 in which a nose clip has not been used.…”

“…Studies conducted in Brazil have shown that it is necessary to evaluate different populations and provide different parameters for them, once there may be differences between the characteristics of these individuals, in distinct regions of the same country 9,10 and even in the same region 9 .…”