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| Neurobehavioral functions among workers exposed to manganese ore |
Used the Neurobehavioral Core Test Battery of the WHO (B. L. Johnson, 1990) with 17 male Singaporean baggers in a manganese ore milling plant and 17 matched controls. Of the 37 symptoms related to the nervous system, 20 were more frequently reported by the exposed workers. No significant differences were noted between the nerve conduction of the median and ulnar nerves of the dominant forearm of the 2 groups. The exposed workers had significantly poorer motor speed, visual scanning, visuomotor coordination, visuomotor and response speed, and visuomotor coordination and steadiness. A clinical examination did not reveal any abnormality among the 2 groups. Hence, a neurobehavioral test battery may be a more sensitive method than a clinical examination in detecting early changes in motor function among manganese-exposed workers.
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