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Procedures for collecting and organizing data useful for the analysis of variable lifting tasks and for computing the VLI.
Colombini-D; Occhipinti-E; Alvarez-E; Hernandez-A; Waters-TR
Proceedings of the 17th World Congress on Ergonomics (IEA2009), Beijing, China, August 9-14, 2009. Madison, WI: International Ergonomics Association, 2009 Aug; :1-3
This work presents, from a practical and applicative point of view, the procedures for evaluating several manual lifting (sub)tasks including the "variable tasks" and for calculating the corresponding VLI (variable lifting index), maintaining the original NIOSH criteria, via simplifications in data collection and a new dedicated software. This revised procedure is not "mandatory" but could be considered as a guideline to all potential users on how to adequately collect and manipulate relevant data to produce the final output. In this revised procedure, it is suggested to describe all the loads handled by a worker in a shift and to group them into 5 "weight categories". For each of them the relevant aspects of "lifting geometry" are also described: vertical origin/destination (simplified in 2 possibilities); horizontal distance (simplified in 3 possibilities); asymmetry (simplified in only 1 possibility : present or not). For each lifting geometry, within each weight category, the lifting frequency will be estimated. This procedure generates up to (and no more than) 30 variables (or subtasks) (5 loads x 2 vertical geometries x 3 horizontal geometries). At the end it will be possible to compute individual FILI (for up to 30 subtasks). Since up to 30 FILI (for corresponding subtasks) are still too many, it is suggested to proceed to a further "aggregation", by grouping the 30 possible FILI into up to 6 "FILI Categories" and compute the cumulative frequency for each FILI category. After this aggregation one can proceed to compute the VLI using the "traditional" CLI (composite lifting index) approach.
Ergonomics; Workers; Worker-health; Occupational-health; Occupational-exposure; Manual-lifting; Manual-materials-handling; Computer-models
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Proceedings of the 17th World Congress on Ergonomics (IEA2009), Beijing, China, August 9-14, 2009
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Content source: National Institute for Occupational Safety and Health Education and Information Division