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Vibration from a riveting hammer causes severe nerve damage in the rat tail model.

Authors
Raju-SG; Rogness-O; Persson-M; Bain-J; Riley-D
Source
Muscle Nerve 2011 Nov; 44(5):795-804
NIOSHTIC No.
20040082
Abstract
INTRODUCTION: Hand-arm vibration syndrome (HAVS) is an occupational neurodegenerative and vasospastic disorder in workers who use powered hand tools. Frequency weighting (ISO 5349) predicts little risk of injury for frequencies >500 HZ. Potentially damaging high frequencies abound in impact tool-generated shock waves. METHODS: A rat tail impact vibration model was developed to deliver shock-wave vibration from a riveting hammer to simulate bucking bar exposure. Rat tails were vibrated continuously for 12 min. Tail flick withdrawal times were determined for noxious heat. Nerve trunks and skin were processed for light and electron microscopy. RESULTS: Immediately after vibration, the tails were hyperalgesic and had disrupted myelinated axons, fragmented nerve endings, and mast-cell degranulation. By 4 days, the tails were hypoalgesic; nerve endings were lost in the skin. CONCLUSIONS: Shock-wave vibration causes severe nerve damage. Frequency weighting seriously underestimates the risk of nerve injury with impact tools.
Keywords
Vibration-effects; Vibration-exposure; Vibration; Vibration-disease; Hand-injuries; Arm-injuries; Neuromuscular-function; Neuromuscular-system; Hand-tools; Exposure-limits; Exposure-levels; Shock-waves; Nerve-damage; Author Keywords: hand-arm vibration syndrome; impact tools; Langerhans cells; mast cells; skin denervation
Contact
Danny Riley, PhD, Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wisconsin 53226
CODEN
MUNEDE
Publication Date
20111101
Document Type
Journal Article
Email Address
dariley@mcw.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-003493; B01182012
Issue of Publication
5
ISSN
0148-639X
Source Name
Muscle & Nerve
State
WI
Performing Organization
Medical College of Wisconsin, Milwaukee, Wisconsin
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