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Employees in Europe work on average 7.2 h per day. Prolonged periods of uninterrupted cognitive activity during the working day can cause changes in motivation, mental fatigue, and deterioration in cognitive function. In this exploratory study, we aimed to determine the effectiveness of taking 10-min breaks for light exercise every 50 min in preventing these negative effects during a simulated 7-h office-like computer work. Eighteen healthy young adult men (aged 26 ± 3 years) who did not work in an office participated. The effects of 7 h of office-like work with 10-min breaks every 50 min on central nervous system activity, cognitive function, mood, and motivation were investigated and compared with those measured on a control day without work. Our study found that engaging in 7 h of mental work similar to that found in an office environment, with 10-min breaks every 50 min, can negatively impact cognitive efficiency, suppress brain neural network activity, and cause mental fatigue. These effects do not fully recover after a 4.5-h rest. Additionally, taking short breaks during the workday does not prevent mental exhaustion or impairments in cognitive function. These findings should be considered when discussing strategies to prevent mental exhaustion caused by mental work. • Skilled and efficient mental work is in demand in the modern world. • Long lasting uninterrupted sedentary cognitive workload causes mental fatigue. • Short breaks during mental work have been considered to prevent mental fatigue. • Ten-minute breaks every 50 min of 7-h mental work did not prevent mental fatigue. • Cognitive functions did not fully recover to the baseline level after 4.5-h rest. [ABSTRACT FROM AUTHOR]