Evaluation of hand-arm vibration exposure during intermittent use of powered hand tools by mechanical trade workers

This study evaluated hand-arm vibration (HAV) risks associated with common tools and tasks performed by automotive trades workers (boilermakers, tire fitters, and heavy vehicle (HV) mechanics) in a workshop that serviced HVs and some light vehicles (LVs). Assessment of task and daily HAV exposure occurred over a week and followed the methodology from AS ISO 5349:2013. Screening for task-based ergonomic hazards was conducted using the Manual Tasks Risk Assessment Tool V 2.0 (ManTRA) and Quick Exposure Check (QEC) tools to inform the HAV assessment. Workers (with varied prior HAV exposure) also completed a screening questionnaire for related health effects that may be caused or exacerbated by HAV exposure. Boilermakers had typical and individual daily HAV exposures exceeding the recommended exposure action value (EAV) of 2.5 m/s2. In comparison, HAV exposures for mechanics and tire fitters were below the EAV. The use of pneumatic needle scalers and impact wrenches was associated with the highest exposure to HAV. Ergonomic risk factor scores were higher for the hand and arm during several boilermaker and tire fitter tasks. Several workers who completed the screening questionnaire were referred for further medical review. Task vibration measurements had a strong positive linear correlation (r = 0.932, P-value <0.001) with the 75th percentile values reported by the Health and Safety Executive (HSE) for tools used prior to 2015. A conservative approach to the management of HAV risks is recommended, based on the variability and uncertainty in measurements and existing risk models.