Objectives: to evaluate Expiratory Flow Increase Technique (EFIT) effects on respiratory rate (RR), heart rate (HR) and peripheral oxygen saturation (SpO2) in children and teenagers with acute stage community-acquired pneumonia (CAP). Design: a non-controlled and non-randomised study of intervention was carried out, in which each patient was his or her own control. Setting: Medical Emergency Unit at the University of Campinas Medical School Population: One hundred and twenty-three patients (68 males / 55 females) aged from 0.8 to 143.2 months (mean ± standard deviation: 24,3 ± 24,6) with CAP diagnosis were analyzed. Intervention: respiratory physiotherapy using EFIT, performed once daily. Outcome measures: HR, RR and SpO2 values were recorded during three different periods of time: before EFIT was performed, immediately after the intervention, and after a 20 minute-rest. Results: SpO2 values improved significantly after the technique was performed (92.5 ± 4.2 vs 93.2 ± 4.1, p = 0.019) and were maintained elevated for all patients. HR and RR values increased significandy after the procedure (137.3 ± 21.7 vs 145.2 ± 22.3, p = 0.010; 46 ± 11.4 vs 48.5 ± 11.7, p = 0.000) and returned to basal values after resting. Conclusion: Although EFIT increases HR and RR values transitorily, the technique is favorable for treating children and teenagers with CAP, as this technique increases SpO2 values, regardless of their ages or disease association with pneumonic episodes.4532328Hill, S.L., Webber, B., Mucus transport and physiotherapy - A new series (1999) European Respiratory Journal, 13 (5), pp. 949-950. , DOI 10.1034/j.1399-3003.1999.13e03.xWallis, C., Prasad, A., Who needs chest physiotherapy? 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