Postural analysis and repetitive motions of skidder operators in wood extraction

Abstract

Mechanized wood harvesting work may present risks to the operator s health. Thus, wood harvesting operations should be evaluated in relation to the postures adopted by operators and the repetitive motions of their upper limbs. The aim of this study was to analyze the postures and movements of upper limbs adopted by skidder operators in the wood extraction operation. The study was carried out in Pinus stands located in Paraná State, southern Brazil. The data were obtained by filming the skidder operators during the work shift. Then, typical postures were identified, and repetitive motions of upper limbs were quantified. Skidder operators have been exposed to harmful conditions to their health, due to the long period when they remained with postures deviated from the neutral line, as well as the trunk tilt and neck rotation, and absence of pauses to recover the upper limbs posture. For the adopted movements, wood extraction operation was classified as of average repeatability. Therefore, in the wood extraction, inadequate postures and repetitive motions are adopted by the skidder operators, for which ergonomic measures are needed to improve working conditions.