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The association between combination of hand force and forearm posture and incidence of lateral epicondylitis in a working population.

Authors
Fan-ZJ; Silverstein-BA; Bao-S; Bonauto-DK; Howard-NL; Smith-CK
Source
Hum Factors 2014 Feb; 56(1):151-165
NIOSHTIC No.
20042909
Abstract
Objective: The objective of this prospective study is to investigate the exposure-response relationships between various workplace physical exposures of force, repetition, and their combination assessed at an individual level with lateral epicondylitis (LE). Background: Workplace upper extremity musculoskeletal disorders (UEMSDs) are prevalent, disabling, and expensive. LE is one of the major UEMSDs in active workers. Method: We used detailed health history, symptoms, and physical examination for identifying incidence and detailed exposure assessment to capture work tasks of each worker and to measure quantitative mechanical workload. We used counting process style input of proportional hazards regression for modeling cumulative incidence that accounts for changed exposure estimates during the follow-up period when respondents change jobs. Results: The incidence rate of LE on the dominant side was 4.91 per 100 person-years. Adjusted for age and gender, the combined effect of forearm pronation >45 for >40% of time and time spent with forceful exertion, including any power grip (hazard ratio [HR] = 2.8, 95% confidence interval [CI] = [1.35.5.77]), lifting for .3% of time (HR = 2.50, 95% CI = [1.19.5.24]), and duty cycle for forceful exertion for >10% (HR = 2.25, 95% CI = [1.09.4.66]), were significant predictors of dominant side LE, whereas neither the awkward posture nor the forceful exertion alone was significant. Older workers with jobs requiring a high percentage of time working with force in combination with awkward postures of forearm were more likely to predict LE. Conclusion: This study shows the evidence of the etiologic role of strenuous manual tasks in the occurrence of LE.
Keywords
Exposure-levels; Force; Repetitive-work; Musculoskeletal-system; Musculoskeletal-system-disorders; Workers; Work-capacity; Age-groups; Humans; Men; Women; Statistical-analysis; Analytical-processes; Posture; Author Keywords: forceful exertion; awkward posture of forearm; lateral epicondylitis; incidence
Contact
Z. Joyce Fan, Safety and Health Assessment and Research for Prevention (SHARP), Washington State Department of Labor and Industries, 243 Israel Rd SE Bldg 3, Tumwater, WA 98501
CODEN
HUFAA6
Publication Date
20140201
Document Type
Journal Article
Email Address
fanj235@LNI.wa.gov
Funding Type
Cooperative Agreement
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U01-OH-007316; B20130805
Issue of Publication
1
ISSN
0018-7208
Source Name
Human Factors
State
WA
Performing Organization
Washington State Department of Labor and Industries
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