Method for quantitatively assessing physical risk factors during variable noncyclic work.
Anton-D; Cook-TM; Rosecrance-JC; Merlino-LA
Scand J Work, Environ & Health 2003 Oct; 29(5):354-362
Objectives: Assessing exposure to physical risk factors during variable noncyclic work can be problematic. The purpose of this study was to modify an existing data reduction method for directly quantifying physical exposures during variable noncyclic work. Methods: Myoelectric activity of the finger flexors of two groups of workers, heavy equipment operators (N=25) and mechanics (N=25), was sampled to determine the intensity and duration of forceful exertions during normal tasks. Data were reduced with a modification of the exposure variation analysis (EVA), called clustered EVA (CEVA), using three intensity and two duration categories. A two-way, mixed-effects, repeated-measures analysis of variance evaluated the percentage of sampled work time in each CEVA category. Results: CEVA was able to quantify variable noncyclic work, and it contrasted the work of the two groups, with simple effects significantly different for all the exposure categories. The mechanics performed high-intensity short-duration contractions 9.1% of the time, whereas the operators had similar contractions only 1.8% of the time. Conversely, the operators used low-intensity contractions of prolonged duration over 81% of the time, compared with only 43% for the mechanics. Conclusions: CEVA is a useful modification of EVA for contrasting the noncyclic work typical of understudied industries like construction. A simplification of electromyography with summary measures such as CEVA provides a comprehensible, yet accurate measure of forceful exertions during worktasks.
Construction; Construction-equipment; Construction-industry; Construction-materials; Construction-workers; Exposure-assessment; Exposure-levels; Exposure-limits; Exposure-methods; Injuries; Injury-prevention; Risk-analysis; Risk-factors; Safety-climate; Safety-education; Safety-equipment; Safety-measures; Safety-monitoring; Safety-personnel; Safety-practices; Safety-programs; Muscle-function; Muscle-stress; Muscular-disorders; Musculoskeletal-system-disorders; Occupational-accidents; Occupational-exposure; Occupational-hazards; Occupational-health; Occupational-safety-programs; Occupational-sociology; Occupations;
Author Keywords: construction work; electromyography; exposure assessment; force; musculoskeletal disorder; noncyclic work; physical risk factor; quantitative assessment
D. Anton, Department of Occupational and Environmental Health, College of Public Health, The University of Iowa, Iowa City, IA 52242-5000
Cooperative Agreement; Construction; Grant
Cooperative-Agreement-Number-U60-CCU-317202; Grant-Number-T42-CCT-717547; Grant-Number-T42-OH-008491
Scandinavian Journal of Work, Environment and Health
The Center to Protect Workers' Rights