Weight Training Manual. DO use your legs, and not your back, when lifting heavy weight or objects. Lift with a continuous motion at a medium rate of speed. If the risks associated with hazardous manual tasks are not eliminated or minimised they can cause significant and even irreversible injuries or disorders.
Learn how to use the NIOSH Lifting Equation to evaluate the lifting and lowering tasks in your workplace. Editor’s note: This is a lengthy post! If you’d rather work your way through this guide with a PDF file,. You will also find the useful for performing assessments using this ergonomic assessment tool. Introduction The NIOSH Lifting Equation is a tool used by occupational health and safety professionals to assess the manual material handling risks associated with lifting and lowering tasks in the workplace. This equation considers job task variables to determine safe lifting practices and guidelines. The primary product of the NIOSH lifting equation is the Recommended Weight Limit (RWL), which defines the maximum acceptable weight (load) that nearly all healthy employees could lift over the course of an 8 hour shift without increasing the risk of musculoskeletal disorders (MSD) to the lower back. Abb S4cplus Controller Manual on this page.
In addition, a Lifting Index (LI) is calculated to provide a relative estimate of the level of physical stress and MSD risk associated with the manual lifting tasks evaluated. NIOSH Lifting Equation Outputs Recommended Weight Limit (RWL): Answers the question “Is this weight too heavy for the task?” Lifting Index (LI): Answers the question “How significant is the risk?” A Lifting Index value of less than 1.0 indicates a nominal risk to healthy employees. A Lifting Index of 1.0 or more denotes that the task is high risk for some fraction of the population.
As the LI increases, the level of low back injury risk increases correspondingly. Therefore, the goal is to design all lifting jobs to accomplish a LI of less than 1.0.
The NIOSH lifting equation always uses a load constant (LC) of 51 pounds, which represents the maximum recommended load weight to be lifted under ideal conditions. From that starting point, the equation uses several task variables expressed as coefficients or multipliers (In the equation, M = multiplier) that serve to decrease the load constant and calculate the RWL for that particular lifting task.