Further evidence of a relation between noise-induced permanent threshold shift and vibration-induced digital vasospasms.

Abstract:

:The relation between noise-induced permanent threshold shift (NIPTS) and vibration-induced dysfunction in the digital circulation was examined in a longitudinal survey among forest workers. The survey was based on annual examinations done between 1972 and 1983. Thirty-two forest workers with digital vasospasms were compared with referents matched for age, exposure, and use of ear protectors. No significant differences between the groups were observed at 1,000 or 2,000 Hz. The forest workers with digital vasospasms had significantly greater NIPTS at 4,000 and 8,000 Hz than the symptom-free referents. During the follow-up period, the gap in NIPTS between the two groups did not increase. Vibration measurements from chain saws manufactured in different years indicated that chain saws manufactured after 1970 had a tenfold reduction in vibration, whereas the reduction in noise levels was only slight. The results suggest that vibration-induced activation of the autonomic nervous system, which is thought to elicit digital vasospasms, may also contribute to the development of NIPTS.

journal_name

Am J Otolaryngol

authors

Pyykkö I,Starck J,Pekkarinen J

doi

10.1016/s0196-0709(86)80013-8

subject

Has Abstract

pub_date

1986-11-01 00:00:00

pages

391-8

issue

6

eissn

0196-0709

issn

1532-818X

pii

S0196-0709(86)80013-8

journal_volume

7

pub_type

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