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Temperature and vibration perception thresholds in workers exposed to hand-arm vibration
1Department of Public Health Science and General Practice, University of Oulu, Finland.
Central European Journal of Public Health
|January 1, 1995
Summary
Hand-arm vibration damages peripheral nerves. Measuring temperature sensation may detect this nerve damage earlier and more sensitively than vibration perception thresholds in exposed workers.
Area of Science:
- Occupational Health
- Neurology
- Biophysics
Background:
- Hand-arm vibration exposure can lead to peripheral nerve damage in the upper extremities.
- Early detection of vibration-induced neuropathy is crucial for prevention and management.
- Thin nerve fibers are hypothesized to be the most vulnerable to vibration damage.
Purpose of the Study:
- To compare vibration perception thresholds (VPT) and thermal sensory thresholds in workers exposed to hand-arm vibration.
- To evaluate the sensitivity of thermal sense measurements for early detection of neuropathy compared to VPT.
Main Methods:
- A case-control study involving 15 vibration-exposed workers (lumberjacks) and 15 matched controls.
- Vibration perception thresholds measured using modified Bruel & Kjaer equipment.
- Thermal sense assessed via the Marstock method using a thermostimulator.
Main Results:
- Vibration-exposed workers exhibited lower cold thresholds and wider thermal neutral zones.
- Slightly higher VPTs at high frequencies (125-500 Hz) were observed in exposed workers.
- Temperature sense deterioration was more prevalent (66-73%) than VPT changes (53-66%) in exposed individuals.
Conclusions:
- Thermal sense measurement, particularly the neutral zone width, appears more sensitive than VPT for detecting early nerve damage from hand-arm vibration.
- Temperature sensation assessment is a valuable tool for preventing vibration-induced nerve damage.
- This suggests thermal sense testing could be a more sensitive indicator of early vibration-induced neuropathy.