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A longitudinal study of finger systolic blood pressure and exposure to hand-transmitted vibration

  • Massimo Bovenzi
  • Flavia D’Agostin
  • Francesca Rui
  • Corrado Negro
Original Article

Abstract

Objectives

To investigate prospectively the relation between vibration-induced white finger (VWF), exposure to hand-trasmitted vibration (HTV) and the cold response of digital arteries in users of vibrating tools.

Methods

Two-hundred and sixteen HTV workers and 133 control men of the same companies underwent initially a medical examination and a standardised cold test with measurement of the change in finger systolic blood pressure (FSBP) after finger cooling from 30 to 10°C. They were re-examined 1 year later. Tool vibration magnitudes were expressed as frequency-weighted and unweighted r.m.s. accelerations. From the vibration magnitudes and exposure durations, alternative measures of cumulative vibration dose were calculated for each HTV worker, according to the expression: \( \text{dose} = \sum a_i^m t_i\), where a i is the acceleration magnitude on tool i, t i is the lifetime exposure duration for tool i, and m = 0, 1, 2 or 4.

Results

Among the HTV workers, the initial prevalence and the 1-year incidence of VWF were 18.1 and 1.7%, respectively. At the first examination, the HTV workers with moderate or severe score for VWF showed a significantly increased cold reaction in the fingers when compared with the controls and the HTV workers with no vascular symptoms. At the follow-up, the controls, the asymptomatic HTV workers, and the prevalent cases of VWF did not show significant changes in the cold response of digital arteries. A deterioration of cold-induced digital vasoconstriction was found in the incident cases of VWF. In the HTV workers, vibration doses with high powers of acceleration (i.e., \( \text{dose} = \sum a_i^m t_i\) with m > 1) were major predictors of the vasoconstrictor response to cold at the follow-up examination.

Conclusions

The measurement of FSBP after local cooling may be a helpful objective test to monitor prospectively the change in vibration-induced vascular symptoms. The findings of this longitudinal study suggest a dose–effect relationship between cold-induced digital arterial hyperresponsiveness over time and measures of cumulative vibration exposure. In the controls, the cold response of the digital arteries was stable over 1-year follow-up period.

Keywords

Cold provocation test Finger systolic blood pressure Follow-up Hand-transmitted vibration Vibration-induced white finger 

Notes

Acknowledgments

This research was supported by the European Commission under the Quality of Life and Management of Living Resources programme—Project No. QLK4-2002-02650 (VIBRISKS).

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Massimo Bovenzi
    • 1
  • Flavia D’Agostin
    • 1
  • Francesca Rui
    • 1
  • Corrado Negro
    • 1
  1. 1.Clinical Unit of Occupational Medicine, Department of Public Health SciencesUniversity of TriesteTriesteItaly

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