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A critical review of evidence related to hand-arm vibration syndrome and the extent of exposure to vibration
This report describes a systematic literature review on the nature of the exposure-response relationship between hand-transmitted vibration and the elements of hand-arm vibration syndrome (HAVS), ie the vascular, neurosensory and musculoskeletal components. Annex C of ISO 5349-1:2001 contains an exposure-response relationship for vascular HAVS, yet this review of the literature has not found any strong evidence of a precise quantitative relationship between exposure to vibration and health outcomes, either for vascular or neurosensory HAVS. There is some evidence that suggests possible limited...
Relationships of neurosensory disorders and reduced work ability to alternative frequency weightings of hand-transmitted vibration
Objective: This cohort study aims to compare the performance of alternative frequency weightings of hand-transmitted vibration (HTV) for the assessment of the exposure–response relationships for neurosensory disorders and reduced work ability among HTV-exposed workers. Methods: In a 3-year follow up study, the occurrence of neurosensory symptoms and reduced work ability, and the response to quantitative sensory testing (grip force, manipulative dexterity, touch sensation) were investigated in 249 HTV-exposed workers and 138 healthy controls. Among the HTV-exposed workers, the sensory outcomes...
Ethylbenzene-Induced Hearing Loss, Neurobehavioral Function, and Neurotransmitter Alterations in Petrochemical Workers
Objective : To estimate hearing loss, neurobehavioral function, and neurotransmitter alteration induced by ethylbenzene in petrochemical workers. Methods : From two petrochemical plants, 246 and 307 workers exposed to both ethylbenzene and noise were recruited—290 workers exposed to noise only from a power station plant and 327 office personnel as control group, respectively. Hearing and neurobehavioral functions were evaluated. Serum neurotransmitters were also determined. Results : The prevalence of hearing loss was much higher in petrochemical groups than that in power station and control...
Quantitative neurosensory findings, symptoms and signs in young vibration exposed workers
Background: Long-term exposure to hand-held vibrating tools may cause the hand arm vibration syndrome (HAVS) including vibration induced white fingers and sensorineural symptoms. The aim was to study early neurosensory effects by quantitative vibrotactile and monofilament tests in young workers with hand-held vibration exposure. Methods: This cross-sectional study consisted of 142 young, male machine shop and construction workers with hand-held exposure to vibrating tools. They were compared with 41 non-vibration exposed subjects of the same age-group. All participants passed a structured interview...
Characterization of Frequency-Dependent Responses of the Vascular System to Repetitive Vibration
Objective: Occupational exposure to hand-transmitted vibration can result in damage to nerves and sensory loss. The goal of this study was to assess the frequency-dependent effects of repeated bouts of vibration on sensory nerve function and associated changes in nerves. Methods: The tails of rats were exposed to vibration at 62.5, 125, or 250 Hz (constant acceleration of 49 m/s2) for 10 days. The effects on sensory nerve function, nerve morphology, and transcript expression in ventral tail nerves were measured. Results: Vibration at all frequencies had effects on nerve function and physiology...
12e conférence internationale 'effets sur l'homme des vibrations transmises par les machines tenues ou guidées à la main'
Co-organisée par les homologues canadiens et américains de l'INRS et des universitaires, cette conférence a rassemblé à Ottawa (Canada) en juin 2011 une centaine d'experts d'Amérique, d'Asie et d'Europe. En introduction du congrès, les organisateurs ont demandé à l'INRS de faire le point sur l'évolution de la prévention des vibrations ces 40 dernières années en Europe. La soixantaine de communications concernaient la clinique, les effets physiologiques et biodynamiques, l'épidémiologie...
Will brain plasticity be used to improve sensory hand function and diminish disability in vibration induced hand problems?
The well-developed feedback system between the hand and the brain, with continuous proprioception and tactile input that are coordinated with memory systems in the brain, is a prerequisite for regulation of grip force and grip speed. A reorganisation of the cortical hand map can be found after long term work with hand-held vibrating tools; in such situations the cortical hand map is distorted and rearranged into a disorganized pattern. This case series shows that repeated cutaneous forearm anaesthesia over an eight-week period can improve hand function, focusing on sensation. With booster doses...

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