عنوان مقاله [English]
Exercise cause alterations in the immune and hormonal system of human body. Therefore, the purpose of this study was to determine the acute effects of one, two and three bouts of physical education lessons in week on salivary IgA and salivary cortisol of elementary school students. In this quasi-experimental, three groups of 8 boys elementary schools students were with mean age (10 ± 5) years, weight (36 ± 64) kg and high (142 ± 66) cm. First group had participated in physical education lesson program just one session in a week, the second group two sessions and third group three sessions. The saliva samples was collected for determinate IgA and cortisol concentrations before, after and 24 h after of the first, second and tertiary physical education lesson session (in first, second and third group). There was no any significant difference in salivary IgA concentrations of subjects in first (p=0.222), second (p=0.223) and third (p=0.072) groups. The cortisol concentration increased significantly only 24 h after exercise than pre exercise in first group (p=0.012) and this levels were no significantly changed in second (p=0.131) and third (p=0.882) groups. Given the lack of significant changes of salivary IgA levels and immunosuppressant and catabolic hormone of cortisol in present study, it seems that increase physical education lessons hours in week in elementary school will not have adverse effects on the students immune system.