The purpose of the work was to study changes in the mineral composition, lactate content and pH of oral fluid under the influence of high-intensity physical exertion on the body of students with different physical training. Materials and methods. 28 students who were divided into 2 groups, depending on the level of physical training, took part in the study. Group 1 – students who attended only physical education classes. Group 2 – students who, in addition to academic classes, attended sports sections 3-4 times a week. Study participants were tested on a treadmill, performing high-intensity physical activity for 30 minutes. The research was conducted for 7 days. Saliva was taken at rest, in the morning on an empty stomach, and immediately after the end of the exercise test. The study of the content of inorganic phosphorus and total calcium was carried out using a ready-made set of chemical reagents, the pH of the oral fluid was determined using a laboratory pH meter. Lactate content was determined colorimetrically according to the Buchner method. Results and discussion. Under the conditions of intense physical exertion, in the oral fluid of students with a low level of physical training, a probable increase in the content of lactate, a decrease in the pH level and indicators of mineralization of hard tissues of the tooth, such as total calcium and inorganic phosphorus, were observed, which may indirectly indicate a violation of enamel mineralization processes and lead to the development of dental pathologies. In the oral fluid of students with a high level of physical training, only a tendency to a decrease in indicators of mineral metabolism and pH was noted against the background of a probable increase in lactate after intense exercise compared to a state of rest. Such changes may be related to the body's adaptation to intense physical exertion after several years of training. So, the proposed complex of biochemical research of oral fluid in students during constant intense physical activity made it possible to reveal the peculiarities of metabolic changes in oral fluid, which is important for more accurate diagnosis of dental diseases and the development of individual dental caries prevention programs. Conclusion. High-intensity physical exertion leads to slight fluctuations in the lactate content, pH indicator, and mineral composition in the oral fluid of students. The established changes depend entirely on the level of physical training of students and tolerance of physical load, and also reflect the adaptation capabilities of the body to physiological stress
Keywords: calcium, phosphorus, lactate, pH, oral fluid, physical activity
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