Pregnancy influences the respiratory system promoting anatomical and physiologic changes, which can have repercussions on the rates of the muscular respiratory strength. The objectives of this work were to compare the value of the respiratory pressure between nuligestas and primigestas during the third trimester of pregnancy, and to associate those to the predicted proposed by Neder et al., 1999. A transversal corte study including eighty women was studied (40 nulliparous and 40 primiparous in the third term of pregnancy) between 20 and 29 years, eutrophic and without cardiorespiratory diseases history. The average of the values obtained for maximum inspiratory pressure (Pimáx) was: -93.95 cmH2O in the nulliparous and -87.78 cmH2O in the primiparous, which shows statistic difference (p=0.0182). For maximum expiratory pressure (Pemáx), it was reached 98.28 cmH2O and 96.73 cmH2O, respectively, not being statistically significant (p=0.710). Differences between the anatomical and physiologic modifications during the gestation were not observed, but it was verified that Pimáx was just decreased when compared within the nulliparous group, while Pemáx didn't present significant alteration between groups. It was no correlation between actual and values predicted by Neder et al.,1999.
muscle strenght; respiratory system; pregnancy
