An study was carried out in the natural forests of Pinus caribaea, Pinar del Rio province, Cuba, aiming at the evaluation of the different methods used for clearcuting with chainsaw, using the cut-to-length system conducted in such a way to diminish the risks of the occupational diseases in chainsaw operators, and simultaneously to maintain the productivity levels and work quality. The rotation of the work was tested with an alternation controled method by refueling the chainsaw (MAC), and a free alternation method too (MAL). Both methods used: two chainsaw operators, the lever, and the directional felling in those trees exhibiting more than 40cm diameter. These methods were compared to each other, and to that one traditionally applied on natural forests (T), that consists of one operator and its assistant who besides maintaining their functions during this activity, do not use the lever nor make the directional felling, but rather adopt spontaneous pauses. According to the results, the MAC shows to be more appropriate because: it allows to reduce the risks of accidents and occupational diseases in chainsaw operators; provides the balance of the work physiologic load and the decreases of 13.69% in load and 52.08% in the noxious effects from chainsaw, although the productivity over the effective time showed an increase of 27.32% relative to method (T), so diminishing the operating costs that justify the basic wages corresponding to the operator's level for both integrants of the team.
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