Historically, ergonomics assessment tools evaluate a single subtask. However, most jobs require people to perform a number of different subtasks within their work cycle. Given the structure and function of human tissues (like muscle, intervertebral discs, tendons, etc), the accumulated effects of multiple subtasks will present a higher risk for musculoskeletal injury than that associated with any isolated subtask. Ergonomics tools are needed to evaluate these cumulative effects, especially for jobs with many task elements. This webinar will introduce you to the tools that have been used in the past, as well as newer tools that are becoming available.
The presenter will start by proving an overview of: a) some relevant tissue physiology, b) how muscles fatigue and c) the mechanisms of repetitive strain injuries. We will then review more established tools like the Garg metabolic equations, the NIOSH Composite Lifting Index (CLI), cumulative spine compression calculations and the Rohmert equation. I will also introduce you to my MAE equation, the new ACGIH TLV for localized muscle fatigue, and our new field method for determining how much rest muscle groups will need after performing any number of different, sequential subtasks.
Jim Potvin, PhD, was a professor for 23 years and is currently an Professor Emeritus in the Department of Kinesiology at McMaster University and owner of Potvin Biomechanics Inc. His research is directed towards developing valid ergonomics methods to quantify injury risk in the workplace; including the assessment of manual materials handling tasks, the evaluation of upper limb disorders, the development of digital human models and the use of work simulation and virtual reality when performing ergonomics assessments.