• Korean Security Journal
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• no.17
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• pp.131-141
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• 2008

The porpuse of present study was to examine the effects of working time on fatigue and fatigue induced factor in private guard and security. The munber of private guard on which this study has been conducted in 200, who work at large conmpanies, medium or small companies and the like as located in Seoul and kyonggi. In this study blood lactate, phosphorus and ammonia were measred to see the level of fatigue. There was significant difference in blood lactate, phosphorus ammonia and fatigue between working hours(P<0.05). in view of the results of this study, it can be thought that fatigue is more affected by working hours In summary, these results are interpreted to mean that 1) fatigue levels and blood fatigue induced factor (lactate, phosphorus, ammonia) increase due to a rise in working hours.