The strain index and TLV for HAL: risk of lateral epicondylitis in a prospective cohort.
BACKGROUND
This study's objective was to quantify exposure-response relationships between job physical exposure (JPE) and incidence of lateral epicondylitis (LE).


METHODS
A cohort of 536 workers was enrolled from 10 manufacturing facilities and followed monthly for 6 years to ascertain changes in JPE and health status. JPE was individually measured and quantified using the Strain Index (SI) and TLV for HAL. Worker demographics, medical history, psychosocial factors, and current musculoskeletal disorders were obtained.


RESULTS
Fifty-six workers developed LE. In multivariate models JPE, age, family problems, and swimming were associated with increased risk of LE. SI showed an exposure-response relationship with maximum hazard ratio (HR) of 4.5(P = 0.04). TLV for HAL showed a non-statistically significant trend for increased risk of LE (P = 0.19).


CONCLUSIONS
JPE is associated with increased risk of LE. The SI and TLV for HAL are useful metrics for estimating JPE.
Department of Occupational Science & Technology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin.
Arun
A
Garg
Jay M
JM
Kapellusch
Kurt T
KT
Hegmann
Matthew S
MS
Thiese
Andrew S
AS
Merryweather
Ying-Chih
YC
Wang
Elizabeth J
EJ
Malloy
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D015331:Cohort Studies; D012090:Cumulative Trauma Disorders / Q000453:epidemiology*; D006804:Ergonomics; D005260:Female; D006801:Humans; D015994:Incidence; D007221:Industry; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009784:Occupational Diseases / Q000453:epidemiology*; D016273:Occupational Exposure / Q000706:statistics & numerical data*; D011446:Prospective Studies; D013550:Swimming; D013716:Tennis Elbow / Q000453:epidemiology*; D014922:Wisconsin / Q000453:epidemiology; D055815:Young Adult
Strain Index; TLV for HAL; epidemiology; ergonomics; lateral epicondylitis; prospective cohort