Ergonomics manual lifting and handling calculating assignment
Calculate the RWL and LI for the following set of lifting conditions when manually lifting a load weighing 25 lbs:
Horizontal distance of load from body 18
Vertical distance of hands above ground level at lift origin 12
Vertical distance load is moved 18
Angle of trunk rotation 20 degrees
Frequency of lift 20 per hour or 0.33 lifts/minute, AND duration is 8 hours
Tip: If any of the above data are not specifically identified in the NIOSH tables, choose a value in the tables that is closest
Does the manual lift present an increased risk of injury, and if yes, why?
After reviewing the calculation, which of the lifting components (horizontal distance, vertical origin, vertical travel distance, etc.) most significantly causes the RWL to be decreased?
Now calculate RWL and LI when the following changes occur to the lift:
Horizontal distance 12
Frequency of lift 10/hour or 0.17 lifts/minute, AND duration remains 8 hours
Does the manual lift present an increased risk of injury, and if yes, why? Has the risk of lower back injury been reduced from the previous set of lifting conditions? Feel free to explain your thoughts.