ABSTRACT
In 1985, NIOSH convened an ad hoc committee of experts who reviewed the current literature on li–ing, with a special focus on the original NIOSH WPG.* e literature review
33.4.5.3 Frequency Restrictions 902 33.4.5.4 Frequency Multiplier 902
33.4.6 Coupling Component 902 33.4.6.1 Denition and Measurement 902 33.4.6.2 Coupling Multiplier 902
33.5 Procedures 902 33.5.1 Single-Task Job 903 33.5.2 Multitask Job 903 33.5.3 Sequential Li–ing Job 904 33.5.4 Variable Li–ing Job 904
33.5.4.1 Li–ing Index for Single-Task Jobs 905 33.5.4.2 Composite Li–ing Index for Multitask Jobs 906 33.5.4.3 Sequential Li–ing Index 910 33.5.4.4 Variable Li–ing Index 913
33.6 Applying the Equations 915 33.6.1 Using RWL and LI, CLI, SLI, and VLI to Guide Ergonomic Design 915 33.6.2 Rationale and Limitations for Li–ing Index Values (LI, CLI, SLI, and VLI) 916 33.6.3 Job-Related Intervention Strategy 916 33.6.4 Example Problems 916
References 922
was summarized in a document containing updated information on the physiological, biomechanical, psychophysical, and epidemiological aspects of manual li–ing [4]. Based on the results of the literature review, the ad hoc committee recommended criteria for dening the li–ing capacity of healthy workers. e committee used the criteria to formulate the revised li–ing equation.* Subsequently, NIOSH sta™ developed the documentation for the equation and played a prominent role in recommending methods for interpreting the results of the li–ing equation. ˜e revised li¦ing equation re©ects new ®ndings and provides methods for evaluating asymmetrical li¦ing tasks and li¦s of objects with less than optimal couplings between the object and the worker’s hands. ˜e revised li¦ing equation also provides guidelines for a more diverse range of li¦ing tasks than the earlier equation [3].
