Introduction: The modern way of life is characterized by the fact that the workplace is becoming more sedentary and less active. The increased use of computers is further contributing to the so-called sedentary lifestyle. Thus, in addition to reducing sedentariness, the ergonomic workplace also represents a very important factor in preventing injuries to the musculoskeletal system. Purpose: We were interested whether performing combined interventions helped reduce sedentariness at home and the workplace, and whether the physical activity increased and for how much. We tried to determine whether the subjects arranged their workplace more ergonomically after the intervention and if their muscle discomfort subsequently changed. Methods: For our thesis, we chose a quantitative research approach, the experiment. 12 subjects participated in the intervention group and 16 in the control group, all of them performing office work. The intervention group received combined interventions aimed at decreasing sedentary behaviour: education on sedentary behaviour, ergonomics and active recess, and a mobile application. The accelerometer ActivPal was used to measure the time of sedentary behaviour, while we measured the physical activity in minutes with Actigraph. The control group received no interventions. To determine muscle discomfort, we used the modified Corleltt method. Results: The statistical analysis of the results did not show a statistically significant difference between the sedentary time before and after the intervention at the workplace and home. Additionally, the difference in the physical activity of the subjects did not show. The workplace was ergonomically arranged already before the intervention. Discussion and conclusion: Interventions that include education alone do not significantly reduce sedentary behaviour. The subjects expressed higher awareness of sedentary behaviour and its relation to health and well-being. Foreign studies demonstrate the important role of the occupational therapist in adjusting the workplace. Paying attention to active breaks and combined interventions with the participation of the occupational therapist is recommended in further research.
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