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Frequency weighting for vibration-induced white finger compatible with exposure-response models.

Authors
Pitts-PM; Brammer-AJ
Source
Ind Health 2012 Sep; 50(5):397-411
NIOSHTIC No.
20042395
Abstract
An analysis has been performed to derive a frequency weighting for the development of vibration-induced white finger (VWF). It employs a model to compare health risks for pairs of population groups that are selected to have similar health outcomes from operating power tools or machines with markedly different acceleration spectra (rock drills, chain saws, pavement breakers and motorcycles). The model defines the Relative Risk, RR(f(trial)), which is constructed from the ratio of daily exposures and includes a trial frequency weighting that is applied to the acceleration spectra. The trial frequency weighting consists of a frequency-independent primary frequency range, and subordinate frequency ranges in which the response to vibration diminishes, with cut-off frequencies that are changed to influence the magnitude of RR(f(trial)). The frequency weighting so derived when RR(f(trial)) = 1 is similar to those obtained by other methods (W(hf), W(hT)). It consists of a frequency independent range from about 25 Hz to 500 Hz (-3 dB frequencies), with an amplitude cut-off rate of 12 dB/octave below 25 Hz and above 500 Hz. The range is compatible with studies of vasoconstriction in persons with VWF. The results provide further evidence that the ISO frequency weighting may be inappropriate for assessing the risk of developing VWF.
Keywords
Vibration; Vibration-exposure; Hand-tools; Hand-injuries; Injuries; Physiology; Physiological-effects; Physiological-function; Physiological-measurements; Physiological-response; Psychological-reactions; Psychological-responses; Psychology; Exposure-levels; Workers; Etiology; Epidemiology; Power-tools; Risk-factors; Models; Etiology; Statistical-analysis; Humans; Men; Women; Author Keywords: Frequency weighting; Vibration white finger; Exposure-response models; ISO 5349
CODEN
INHEAO
Publication Date
20120901
Document Type
Journal Article
Email Address
brammer@uchc.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008997
Issue of Publication
5
ISSN
0019-8366
Source Name
Industrial Health
State
CT
Performing Organization
University of Conneticut School of Medicine and Dentistry
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