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      Propuesta de Ecuaciones Predictivas de Capacidad Inspiratoria y Flujo Espiratorio Máximo Considerando Mediciones Torácicas: Un Estudio Piloto Translated title: Proposal of Predictive Equations of Inspiratory Capacity and Maximum Spiratory Flow Considering Thoracic Measurements: A Pilot Study

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          Abstract

          RESUMEN: El objetivo del siguiente estudio fue determinar si las mediciones de tórax provocan modificaciones en las ecuaciones predictivas de capacidad inspiratoria (CI) y flujo espiratorio máximo (FEM). Se evaluaron 24 sujetos de sexo masculino entre 18 y 26 años, todos estudiantes sedentarios de la Universidad Católica del Maule, Chile. Se les realizó antropometría corporal básica (peso y talla corporal) y específica de tórax, diámetro antero-posterior (DAT) y transverso (DTT) de tórax y perímetro mesoesternal (PME). Posterior a esto, se evaluó la función ventilatoria a través de pletismografía corporal. Para estimar las ecuaciones de regresión lineal se utilizó el método de mínimos cuadrados relacionando la CI y FEM. La comparación entre el valor predicho establecido y nuestra propuesta fue comparado utilizando la prueba t de student o U de Mann-Whitney según correspondiera, considerándose un nivel de significancia estadística de p<0,05. Los resultados indican que para la propuesta de la ecuación de FEM se consideró el DTT y PME, logrando diferencias significativas con los valores de Knudson et al. Por tanto, se concluye que las mediciones de DTT a VR y PME a CPT influyeron en la ecuación predictiva de FEM en estudiantes sedentarios.

          Translated abstract

          SUMMARY: The aim of the following study was to determine if chest measurements cause changes in the predictive equations of inspiratory capacity (IC) and peak expiratory flow (PEF). Twenty- four male subjects between 18 and 26 years old, all sedentary students of the Universidad Catolica del Maule, Chile, were evaluated. They were subjected to basic body anthropometry (weight and body size) and chest specificity, anteroposterior diameter (APD) and transverse (TTD) of the thorax and mesosternal perimeter (MSP). After this, the ventilatory function was evaluated through body plethysmography. To estimate the linear regression equations, the least squares method were used, relating IC and PEF. The comparison between the established predicted value and our proposal was compared using the student t-test or Mann-Whitney U test as appropriate, considering a level of statistical significance of p <0.05. The results indicate that the TTD and MSP were considered for the proposal of the PEF equation, achieving significant differences with the values o f Knudson et al. Therefore, it is concluded that measurements of TTD to RV and MSP to TPC influenced the predictive equation of PEF in sedentary students.

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          Most cited references10

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          Standardisation of spirometry.

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            African ancestry, lung function and the effect of genetics

            African-Americans have smaller lung function compared with European-Americans. The aim of this study was to disentangle the contribution of genetics from other variables on lung function. A cohort was followed from birth to 30 years of age in Brazil. Several variables were collected: genomic analysis based on DNA; forced expiratory volume in 1 s (FEV1) and forced vital capacity (FVC) obtained by spirometry; height measured by anthropometrists; and thorax circumference evaluated by photonic scanner. Crude and adjusted linear regression models were calculated according to African ancestry. The sample comprised 2869 participants out of 3701 members of the cohort. Males with higher African ancestry by DNA analysis had a smaller FEV1 (−0.13 L, 95% CI −0.23– −0.03 L) and FVC (−0.21 L, 95% CI −0.32– −0.09 L) compared with those with less African ancestry, having accounted for height, sitting to standing height ratio and other confounders. Similar effects were seen in females. After adjustment, ancestry remained significantly associated with lung function, but the large effect of adjustment for confounding among males (but not females) does not allow us to exclude the possibility that residual confounding may still account for these findings.
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              Are ethnic differences in lung function explained by chest size?

              Ethnic differences in lung function (LF) are recognised in adults and children. Most prediction equations for LF are derived from whites, so non-whites are at risk of erroneous assessment. It was hypothesised that differences in chest dimensions would explain differences in LF between Asian (Indian) and white schoolchildren.

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                ijmorphol
                International Journal of Morphology
                Int. J. Morphol.
                Sociedad Chilena de Anatomía (Temuco, , Chile )
                0717-9502
                March 2018
                : 36
                : 1
                : 333-337
                Affiliations
                [1] Temuco orgnameUniversidad de la Frontera Chile
                [2] Temuco Araucanía orgnameUniversidad de La Frontera orgdiv1Centro de Excelencia en Estudios Morfológicos y Quirúrgicos Chile
                Article
                S0717-95022018000100333
                fcbff33c-7746-479c-b6d8-304ce9965adb

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 14 December 2017
                : 22 September 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 13, Pages: 5
                Product

                SciELO Chile


                Antropometría de tórax,función pulmonar,ecuaciones predictivas.,Chest anthropometry,Lung function,Predictive equations.

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