Early school-age children can achieve a good physiological load in elementary games so that the value of these games is unquestionable. The aim of this paper is to monitor the physiological load of children in certain games, determine in which games it will be the highest, and is there a difference considering the age of the participants. The physiological load will be monitored by measuring the pulse during games of high, moderate and low intensity. The research was conducted on students of the 1st, 2nd, 3rd and 4th grade of the "Pehlin" elementary school. There was a statistically significant difference shown in the physiological load of students during different parts of the class, as well as in the physiological load of the students with regards to their age. The largest and the most equal physiological load is achieved in the introduction and the main - "B" part of the class, which is preferable in practice. 4th grade students have achieved the highest physiological load in various elementary games, which is understandable since 4th grade students have the most developed kinantropological status. Adequate physiological load of students has a beneficial effect on the development of the cardiovascular and respiratory system. Therefore, it is essential that classroom teachers in PE (Physical Education ) classes provide an optimal physiological load during all parts of the class.