Abstract
The workload and work efficiency on thinning operation by the use of large (L) and small (S) chainsaws in pine plantation in Java Island, Indonesia were examined in March-April, 2005. The workload of three operators was calculated by employing particular relations of heart rate-%VdotO_2max estimated through step test. Besides observation on actual work, a model test: holding L and S chainsaws at F (far off) and C (close) to the body was carried out. The study showed that L demanded significantly greater workload than S. In relating with holding postures, the workload demanded for F and C was significantly different on L, but there was no significant difference on S. A z-statistic analysis on felling, bucking and delimbing showed that the workload demand on L was greater than S due to chainsaw's weight differences. Analysis on vibration and noise (factors associated with chainsaws) confirmed that L generated greater impact to the workload than S. Working performance of L was superior to S. However, L produced lower work productivity than S. As a result, the use of S would provide better protection on safety and health of operators. Improvement on work elements, especially on watching, maintenance and clearing, combined with performing better cutting technique and adequate resting were considered as important attempts to attain optimum work efficiency on the use of S.
