Behavior of respiratory muscle strength in morbidly obese women by using different predictive equations.

Rev Bras Fisioter

Postgraduate Physical Therapy Program, Universidade Metodista de Piracicaba, Piracicaba, SP, Brasil.

Published: February 2014

AI Article Synopsis

  • The study evaluated respiratory muscle strength (RMS) in 30 morbidly obese women compared to a control group of 30 normal-weight women.
  • The results indicated that morbidly obese women had higher maximal inspiratory pressure (MIP) values than their normal-weight counterparts, but their MIP was lower than what the EHarik predictive equation suggested.
  • While no significant differences were found in maximal expiratory pressure (MEP) between the groups, the most suitable equation for predicting MIP values in morbidly obese women was identified as the Harik-Khan equation.

Article Abstract

Background: Studies on the behavior of respiratory muscle strength (RMS) in morbidly obese patients have found conflicting results.

Objectives: To evaluate RMS in morbidly obese women and to compare the results by using different predictive equations.

Method: This is a cross-sectional study that recruited 30 morbidly obese women and a control group of 30 normal-weight women. The subjects underwent anthropometric and maximal respiratory pressure measurement. Visual inspection of the Bland-Altman plots was performed to evaluate the correlation between the different equations, with a p value lower than 0.05 considered as statistically significant.

Results: The obese women showed a significant increase in maximal inspiratory pressure (MIP) values (-87.83±21.40 cmH(2)O) compared with normal-weight women (-72±15.23 cmH(2)O) and a significant reduction of MIP (-87.83±21.40 cmH(2)O) according to the values predicted by the EHarik equation (-130.71±11.98 cmH(2)O). Regarding the obtained maximal expiratory pressure (MEP), there were no between-group differences (p>0.05), and no agreeement was observed between obtained and predicted values of MEP and the ENeder and ECosta equations.

Conclusions: Inspiratory muscle strength was greater in the morbidly obese subjects. The most appropriate equation for calculating the predicted MIP values for the morbidly obese seems to be Harik-Khan equation. There seem to be similarities between the respiratory muscle strength behavior of morbidly obese and normal-weight women, however, these findings are still inconclusive.

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