Abstract
Hand-arm vibration was measured on the handlebars of snowmobiles (N=23) and a postal inquiry was made among N=2705 reindeer herders (snowmobile drivers) in a study of vibration syndrome. Since many subjects had also used other vibrating tools the snowmobile group proper (N=334) was established and in this group 18% of the subjects reported having experienced white finger attacks and 48% numbness of the hands. The age-adjusted prevalence of white finger was more than three times higher in this snowmobile group proper than in the controls, and the association was not confounded by age or smoking. The finding was similar but weaker for numbness of the hands. The frequency-weighted acceleration of snowmobile vibration was 3.5 m/s2, and risk evaluation using the annex A of ISO 5349 standard predicted well the prevalence of white finger in the snowmobile group proper (17%). In conclusion, the present results indicate vibration syndrome as being also related to snowmobile vibration in reindeer herders.
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