The aim of the bachelor's thesis is to evaluate the energy expenditure of selected simulated activities of firefighters during the rescue and its comparison with the maximum allowed values, which are given by Decree no. 542/2007 Coll. Ministry of Health of the Slovak Republic on details of health protection against physical stress at work, mental workload and sensory stress at work. The ultimate goal of the work is to propose ways and measures to reduce the risk - the danger of physical exhaustion of the firefighter during the intervention. The work has a theoretical-empirical character and is structured into four chapters. The first theoretical chapter deals with the current state of the issue in terms of theoretical background, definitions and legislation of physical activity, energy expenditure and the fire profession with emphasis on its physical demands. The second chapter defines the goals and tasks of the work. In the third methodological chapter, the author presents the methodology of the work and research methods. The focus of the work is the fourth chapter, which brings the results of measurements, their comparison with the permitted legislative standard, discussion and proposal of measures. This chapter completes the goal of the work. The author presents the most important findings, which include the statement that energy expenditure in simulated activities of firefighters during the rescue does not exceed the values allowed by the decree, but heart rate values in simulated activities for survey respondents exceed the permitted standards by about 30%. One of the most serious measures proposed is the requirement for a balanced alternation of demanding physical activity with adequate rest.