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During the work, laborers are often in bent, half-bent and crouching position because they need to finish their working activity. These working activities are changed many times during the working day. In this article, the use of software package CATIA for calculating the loads is being described. If the working place is not designed on the right way, exceeded overloads are present and they are not really desirable for the health of the laborer. The laborer will be more fatigue and less efficient on work and its health is being endangered. In this article, the load in L4/L5 vertebra is analyzed in 3 positions of the laborer, during the process of taking, carrying and putting the cement in the truck. After calculations of organism load, another calculation of energy consumption is done for that specific working place in the function of our laborers diet