Abstract
In order to estimate work efficiency (WE) and workload of manual log transportation (log species: Tectona grandis L.f.), factors of log transportation were grasped, and then the possibility of reducing in workload was examined. The research was carried out on 2 workers at Banjarejo Log Yard, East Java, Indonesia in 2002. Parameters, chosen based on 1997's research, were transporting distance [D1(<10m), D2(10-20m), D3(20m<)], and log classification [L1(1 log, 1 worker; log weight 35 kg, diameter 15 cm), L2 (1 log, 2 workers; log weight 95 kg, diameter 30 cm), L3 (1 log, 8 workers; log weight 450 kg, diameter 60 cm)]. Average WE was D1:0.593, D2:0.212, and D3:0.121 m^3/m/hr/man. There was a strong linear (positive) relationship between transporting distance and carrying time, and strong exponential (negative) relationships between transporting distance and WE and also between carrying time and WE. WE at L2 was higher than at L1. The average results of workload to energy expenditure during transportation (EETr) were L1: 0.0797, L2: 0.0711, and L3: 0707 kcal/kg/min; Relative Metabolic Rate (RMR) was L1: 3.2, L2: 2.7, and L3: 2.7; and total energy expended during a day's work (EEWT) was L1: 1356, L2: 1216, and L3: 1222 kcal/day. Workload was heavier at L1 than at L2. According to these results, it is highly probable that transporting L2 will result in higher WE, but also in a lighter workload than that of L1. Therefore, the method applied to transporting L2 is strongly recommended for transporting L1.
