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The aim of this research was to determine the differences between the addmission exam results and the results achieved at the end of the first year of study in the maximum isometric muscle force of the back extensor muscles among the students at the University of Criminal Investigation and Police Studies (UCIPS) in Belgrade, which occurred as a result of regular Special Physical Education (SPE) classess. The study sample consisted of 80 male students aged 19-21 (TV = 181.81 ± 7.31cm, TM = 79.19 ± 8.09kg, BMI = 23.96 ± 1.79kg / m2). The results achieved by the students on the Basic Motor Skills (BMS) admission test, as an initial measurement, and the results achieved on the BMS assessment tests within the subject of SPE, as a final measurement were analyzed.To determine the significance of the differences between the results of the initial and final measurements, a T-test was used for the dependent samples. After SPE classes were conducted, the results of measurement demonstrated mprovement in the final measurement (Mean ± SD = 190.5 ± 21.0 DaN) compared to the initial measurement (Mean ± SD = 158.8 ± 21.44 DaN), at a statistically significant level (t = -14,283; p <0.000). Based on the results obtained, it can be concluded that, during the first year, SPE teaching has had a statistically significant impact on the improvement of the maximum isometric muscle force of the back extensor muscles in students. 1 This paper is part of the National Scientific Project entitled “Effects of Applied Physical Activity on Locomotor, Metabolic, Psycho-Social and Educational Status of the Population of the Republic of Serbia” under the project number III47015 (project manager prof. dr Milivoj Dopsaj), and as part of the subproject entitled “Effects of Applied Physical Activity on Locomotor, Metabolic, Psycho-Social and Educational Status of the Police Population in Serbia”, which was funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia the 2011-2019 cycle of scientific projects. 2 Corresponding author: dr Bojan Mitrović, Police Training Center, Ministry of the Interior of the Republic of Serbia. E-mail: bojan.mitrovic@mup.gov.rs JO U RN AL O F SE CU RI TY A N D CR IM IN AL S CI EN CE S • Vo l. 1, N o. 2 (2 01 9) UNIVERSITY OF CRIMINAL INVESTIGATION AND POLICE STUDIES, BELGRADE 54

žurnal za bezbjednost i kriminalistiku

The effects of Special Physical Education on changes in the maximum isometric muscle force of the back extensor muscles in the students at the University of Criminal Investigation and Police Studies