Introduction: Six-minute walk test (TC6') and peak expiratory low (PEF) can be in luenced by variables like gender, age and body mass index (BMI). In the school context, these tests can identify losses caused by sedentary habits and/or manifestation of overweight/obesity. Nevertheless, although widely studied in the adult context, they have not been properly clari ied in the child public. Objective: To assess the PEF and TC6' between students in the public and private network and to correlate them with factors like age, gender and BMI. Methods: 39 male and female children between eight and ten years of age were selected for the study. The TC6' was held at a sports court. The child was instructed to walk at maximum speed for six minutes and the PEF test took place in accordance to the recommendations by Pereira et al (1). Results: No signi icant correlation was found between the BMI and the PEF and TC6' scores. No signi icant correlation was found between sex and PEF, with measures within normal parameters for the entire sample. The EPF measures did not in luence the distance walked in the TC6'. A signi icant correlation was found between sex and distance walked in the TC6' only among male children attending public schools. Conclusion: Both sex and BMI did not in luence the PEF measures which, in turn, does not seem to have in luenced the distance the sample walked in the TC6'. Also concerning the TC6', only the children from public school reached the normal scores proposed in the literature.