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Continuing Education — "The Action Level!®"

VOLUME 7(5), May 2010
Journal of Occupational and Environmental Hygiene


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CASE STUDIES:

Accuracy of the Borg CR10 Scale for Estimating Grip Forces Associated with Hand Tool Tasks
Raymond W. McGorry, Jia-Hua Lin, Patrick G. Dempsey and Jeffrey S. Casey

1. Correlations between Borg CR10 ratings and power grip
    force applied during the three hand tool operations were
    stronger for "pooled" data than those calculated using
    individual values. True or False?

True
False
2. Correlations between Borg CR10 ratings and power grip
    force ____________ when grip force was normalized to
    individual maximum voluntary exertion (MVE) for the
    ratcheting and the lift carry task.
a. increased
b. decreased
c. remained the same
Inter-worker Variability in Lower Body Postures During Assembly Line Work: Implications for Exposure Assessment
W. Monroe Keyserling, Neal Wiggermann, Robert A. Werner and Nancy Gell

3. Between worker variability (lower body postures) proved
    greatest for jobs performed at sit-stand work stations.
    True or False?

True
False
4. A single worker can usually be used to obtain accurate
    ergonomic exposure estimates for jobs performed by multiple
    workers. True or False?
True
False
Metalworking Fluid-Related Aerosols in Matching Plants
Yan Gilbert, Marc Veillette, Anne Mériaux, Jacques Lavoie, Yvon Cormier and Caroline Duchaine

5. What were the most frequently isolated microorganisms
    from metal working fluid (MWF) aerosols?

a. Stenotrophomas maltophilia
b. Mycobacterium immunogenum
c. Pseudomonas pseudoalcaligenes
d. Pseudomonas oleovorans
6. MWF aerosols were shown to contain low concentrations
    of inhalable dust, oil mist, bacteria and endotoxin. True
    or False?
True
False
Insertion Loss of Noise Barriers on an Above Ground Full Scale Model Longwall Coal Mining Shearer
Daniel D. Sweeney, Jeremy M. Slagley and David A. Smith

7. Simple barriers are acoustically transparent (9 dB insertion
    loss) in semi-reverberant sound fields. True or False?

True
False
8. Which of the following constitutes the best explanation for
    above-ground full-scale modeling of noise barriers suggesting
    improved noise control (higher insertion loss) as opposed to
    using underground noise control estimates (lower insertion
    loss)?
a. Lower absorption coefficients in underground
          coal mines (more reflective underground)
b. More relative low frequency sound in the
          underground recordings as compared to the
          pink noise used in the above ground tests
c. Difference in densities of materials used above
          ground vs. that used in the underground
          estimation
d. The Eyring equation
Exposures and Physiological Responses in Power Tool Operations: Fastening vs. Unfastening Threaded Hardware
Jia-Hua Lin, Raymond W. McGorry and Jacob Banks

9. An exposure assessment should include only the most
    frequently used power tool scenarios (fastening) and could
    justifiably exclude infrequently applied scenarios (unfastening).
    True or False?

True
False
10. While operating a powered hand tool such as a pneumatic
      screwdriver, according to the efficiency variables (grip force
      or forearm EMGs per unit of tool torque output) measured
      in this study, unfastening a threaded fastener demands more
      hand-arm exertion than fastening it. True or False?
True
False
Identifying Sources of Lead Exposure for Children, with Lead Concentrations and Isotope Ratios
P. Glorennec, C. Peyr, J. Poupon, Y. Oulhote and B. Le Bot

11. Which of the following is NOT an inherent advantage
      attending the use of isotopic ratio analysis for lead?

a. Utilizes sophisticated instrumental analysis
b. Can utilize multiple ratio analyses
c. Permits analysis of both biological and
          environmental specimens
d. Ensures that the correct exposure source
          is included
12. Utilizing isotopic ratio analysis for lead in blood as a
      biomarker permits comparisons with matrices such as
      window sill lead sources. True or False?
True
False
Validity Assessment of Self-Reported Construction Tasks
Katherine L. Hunting, Elizabeth Haile, Lisa Nessel and Laura S. Welch

13. Ergonomic exposure assessment for epidemiological
     studies of construction workers is challenging because:

a. observation and direct measurement are
          resource intensive
b. a worker's ability to accurately report hazards
          is limited
c. of high variability in tasks and exposures
d. all of the above
14. In this study of sheet metal workers from fabrication shops
     and construction sites, investigators compared worker and
     observer reports of:
a. time spent on tasks
b. reaching, twisting, lifting, bending (etc.)
c. exposure to dusts, solvents, and noise
d. all of the above

Be sure FULL NAME and EMAIL information is provided at the top of this page before submitting your answers.


Deadline for answers is May 31, 2010.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on June 9, 2010.

 
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