The data were systematized in IBM SPSS (Statistical Package for Social Sciences) version 20.0. The data were presented as mean ± standard deviation or median and interquartile range and frequency. To verify the data normality the Shapiro-Wilk test was applied. To compare the behavior of the variables between groups was used independent t test for parametric variables and test U Mann Whitney for nonparametric. As for comparing the average pre and post use of electrical stimulation was used ANOVA test for repeated measurements or Friedman test and to check if there is a relationship between respiratory muscle strength and exercise capacity was used Pearson correlation coefficient or Spearman, according to the normal distribution of data. The significance level for the statistical treatment was 5% (p <0.05).