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Computerized posturography with sway frequency analysis: application in occupational and environmental health
Kazuhito Yokoyama1, Shunichi Araki, Mariko Nishikitani
1Department of Public Health and Occupational Medicine, Graduate School of Medicine/Faculty of Medicine, The University of Tokyo, Japan.
Industrial Health
|April 3, 2002
Summary
Occupational neurotoxicants like lead, n-hexane, and sarin can asymptomatically affect vestibular and cerebellar functions. Computerized posturography reveals vestibulocerebellar sensitivity to these chemicals, aiding in occupational health assessments.
Area of Science:
- Neuroscience
- Occupational Health
- Toxicology
Background:
- Occupational and environmental neurotoxicants pose risks to neurological functions.
- Assessing subclinical effects on the nervous system is crucial for early detection and prevention.
- Vestibular, cerebellar, and spinocerebellar systems are vital for balance and coordination.
Purpose of the Study:
- To investigate the impact of lead stearate, n-hexane, and sarin exposure on vestibular, cerebellar, and spinocerebellar functions.
- To evaluate the utility of computerized posturography with frequency analysis in detecting neurotoxicant-induced neurological deficits.
- To identify which neurological functions are most sensitive to these specific neurotoxicants.
Main Methods:
- Employed computerized posturography with sway frequency analysis to assess three groups: chemical factory workers exposed to lead, solvent factory workers exposed to n-hexane, and sarin-exposed individuals.
- Measured blood lead concentrations (BPbs), urinary 2,5-hexanedione (HD), and plasma cholinesterase (ChE) activities as biomarkers of exposure.
- Analyzed posturographic data to identify patterns of dysfunction in the vestibulocerebellum, anterior cerebellar lobe, and spinocerebellar pathways.
Main Results:
- Lead exposure was associated with asymptomatic effects on the vestibulocerebellum, anterior cerebellar lobe, and spinocerebellar pathways, correlating with concurrent and past lead absorption.
- N-hexane exposure similarly affected vestibulocerebellar and spinocerebellar functions, with potential inhibition of vestibulocerebellar effects by xylene.
- Chronic effects on vestibulocerebellar function were observed even in cases of acute sarin poisoning.
Conclusions:
- The vestibulocerebellar function appears to be the most sensitive to lead, n-hexane, and sarin.
- Computerized posturography with frequency analysis is a valuable tool for assessing subclinical vestibular, cerebellar, and spinocerebellar effects of occupational and environmental neurotoxicants.
- Early detection of neurological dysfunction through advanced assessment techniques can inform occupational health strategies.