School health is a very important area of intervention, considering the prevalence rates and incidence of postural changes in younger age groups. It is pertinent to promote knowledge in this area to prevent these postural changes. Verify the effect of a health promotion session on the knowledge in the 1st cycle students of private school and identify the determinants that influence the Knowledge.

The sample consisted of 46 students from the 1st cycle of private school. A questionnaire on knowledge determinants was delivered to parents/guardians and a questionnaire on postural knowledge was given to students. This questionnaire was applied on the knowledge about the posture of the students, in two moments. The first moment was before the health promotion session and the second was after two weeks of the session, to see if the health promotion session influenced children's knowledge about postural hygiene. Data analysis was performed using Statistical Package for the Social Sciences, version 24. The level of significance was α=0.05.

After the health promotion session, the student's knowledge increase and it was statistic significant (P=0.000). It was also possible to analyse that gender (P=0.00), the environment where they live (P=0.001), pedagogical activities (P=0.000) and sports activities (P=0.000) are determinants that influence knowledge.

This study allowed us to conclude that the health promotion session increased the knowledge about posture in the children of the 1st cycle of private school. It is concluded that gender, environment, pedagogical activities and the sports activities are determinants that influence knowledge.6