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Development and evaluation of an observational method for quantifying exposure to hand activity and other physical stressors in manual work.

Authors
Latko-WA
Source
University of Michigan 1997 Jan; :1-188
Link
NIOSHTIC No.
20024527
Abstract
An observational method was developed in which hand activity/repetition and other physical stressors associated with work related musculoskeletal disorders (WRMSDs) are rated on scales from 0-10. A series of evaluations was performed to determine the method's reliability, internal validity, and external validity. The ratings of repetition were moderately correlated with measures of number of exertions per unit time and the amount of recovery time within the job cycle. Cycle time was not related to the analyst ratings. An analysis of test-retest reliability over a 1 1/2 to 2 year time period revealed a high level of consistency. Twelve jobs were analyzed by four groups of raters to determine inter-rater reliability. There was more variability in the initial ratings (between individuals) than in the final ratings (between groups). Repetition exhibited very strong agreement between raters. A laboratory study was conducted to assess the internal validity of the method. Instrumental measurements of muscle activity and wrist position were compared with ratings of equivalent parameters. When repetition rating was modeled as a function of movement speed and exertion time, both terms were significant and the model explained 88% of the variability in the repetition ratings. For both posture and force, there were significant relationships between the measures obtained from the instrumentation and the ratings $rm(0.28
Keywords
Workplace-studies; Repetitive-work; Work-analysis; Work-practices; Work-intervals; Musculoskeletal-system-disorders; Skeletal-movement; Musculoskeletal-system; Cumulative-trauma-disorders; Cumulative-trauma; Carpal-tunnel-syndrome; Hand-injuries; Age-factors; Ergonomics
Contact
Environmental & Indust Health the University of Michigan 1420 Washington Heights Ann Arbor, MI 48109-2029
Publication Date
19970101
Document Type
Dissertation
Funding Amount
610264
Funding Type
Grant
Fiscal Year
1997
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002941
Priority Area
Grants Other
Source Name
University of Michigan
State
MI;
Performing Organization
University of Michigan at Ann Arbor, Ann Arbor, Michigan
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