The effectiveness of an ergonomics programme to reduce musculoskeletal disorders in high voltage overhead powerline workers

Abstract

High voltage overhead powerline work is physically demanding and exposes workers to a high risk of work-related musculoskeletal disorders (WRMSDs). This study investigated the effectiveness of interventions to reduce the risk of WRMSDs in powerline operators. Sixteen operators from Thailand who regularly used mobile elevating work platforms participated in the study. Following a task evaluation, an ergonomics improvement programme was implemented which involved engineering-design changes (e.g. purpose designed handling devices) and ergonomics training (e.g. techniques to reduce physically demanding postures). Pre- and post-intervention measures involved a musculoskeletal health survey, Rapid Entire Body Assessment (REBA) and the assessment of WRMSD risk levels (risk matrix). The ergonomics improvement programme led to changes in postures and working practices, and a reduction in WRMSD symptom reporting and WRMSD risk classifications when compared to pre-intervention measures. Following the intervention, musculoskeletal discomfort decreased by 25 % in the hands and wrists, 12.5 % in the shoulders, arms, and lower back, and 6.3 % in the neck, upper back, hips, knees, feet, and ankles. There was a significant shift to lower REBA scores and risk matrix classifications changed from high to medium risk. The implementation of engineering-designed changes combined with ergonomics training was effective in reducing the short-term risks associated with WRMSDs in high voltage overhead powerline workers. Further work is needed to determine the long-term effects of these interventions on the occupational health of powerline workers, along with strategies for addressing other risk factors (e.g. psychosocial, work organisation) known to impact on the incidence of WRMSDs.