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Long-term effect of hand-arm vibration on thermotactile perception thresholds

Journal article
Authors R. Lundstrom
Adnan Noor Baloch
Mats Hagberg
T. Nilsson
Lars Gerhardsson
Published in Journal of Occupational Medicine and Toxicology
Volume 13
Pages 19
ISSN 1745-6673
Publication year 2018
Published at Institute of Medicine, Department of Public Health and Community Medicine
Pages 19
Language en
Links doi.org/10.1186/s12995-018-0201-1
Keywords Hand-arm vibration, Hand-transmitted vibration, Hand, Thermotactile perception, small fiber neuropathy, vibrotactile thresholds, neurological diagnosis, transmitted vibration, thermal thresholds, sensation, exposure, cold, disorders, workers, Public, Environmental & Occupational Health
Subject categories Environmental Health and Occupational Health

Abstract

Background: Occupational exposure to hand-transmitted vibration (HTV) is known to cause neurological symptoms such as numbness, reduced manual dexterity, grip strength and sensory perception. The purpose of this longitudinal study was to compare thermotactile perception thresholds for cold (TPTC) and warmth (TPTW) among vibration exposed manual workers and unexposed white collar workers during a follow-up period of 16 years to elucidate if long-term vibration exposure is related to a change in TPT over time. Methods: The study group consisted of male workers at a production workshop at which some of them were exposed to HTV. They were investigated in 1992 and followed-up in 2008. All participants were physically examined and performed TPT bilaterally at the middle and distal phalanges of the second finger. Two different vibration exposure dosages were calculated for each individual, i.e. the individual cumulative lifetime dose (mh/s2) or a lifetime 8-h equivalent daily exposure (m/s(2)). Results: A significant mean threshold difference was found for all subjects of about 4-5 degrees C and 1-2 degrees C in TPTW and TPTC, respectively, between follow-up and baseline. No significant mean difference in TPTC between vibration exposed and non-exposed workers at each occasion could be stated to exist. For TPTW a small but significant difference was found for the right index finger only. Age was strongly related to thermotactile perception threshold. The 8-h equivalent exposure level (A (8)) dropped from about 1.3 m/s2 in 1992 to about 0.7 m/s(2) in 2008. Conclusions: A lifetime 8-h equivalent daily exposure to hand-transmitted vibration less than 1.3 m/s(2) does not have a significant effect on thermotactile perception. Age, however, has a significant impact on the change of temperature perception thresholds why this covariate has to be considered when using TPT as a tool for health screening.

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