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Cognitive functioning in lead workers.

B T Stollery1, H A Banks, D E Broadbent

  • 1Age and Cognitive Performance Research Centre, University of Manchester, UK.

British Journal of Industrial Medicine
|October 1, 1989
PubMed
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Occupational lead exposure significantly impairs sensorimotor function in men. High blood lead levels correlate with cognitive deficits, particularly slowed reaction times, suggesting a primary impact on motor responses.

Area of Science:

  • Occupational Health
  • Neurotoxicology
  • Cognitive Psychology

Background:

  • Occupational exposure to inorganic lead is a significant public health concern.
  • Lead toxicity is known to affect various organ systems, including the nervous system.
  • Understanding the specific cognitive impacts of lead exposure is crucial for effective prevention and intervention.

Purpose of the Study:

  • To investigate the relationship between occupational inorganic lead exposure and cognitive performance in men.
  • To assess sensorimotor reaction time, memory, attention, verbal reasoning, and spatial processing in relation to blood lead levels.
  • To determine the correlation between cognitive task performance and biomarkers of lead exposure, including blood lead concentration, zinc protoporphyrin (ZPP), and urinary aminolaevulinic acid (ALA).

Main Methods:

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  • A cross-sectional study involving 91 male workers with occupational lead exposure.
  • Microcomputer-based tasks were used to assess cognitive functions.
  • Participants were categorized into low, medium, and high blood lead concentration groups (<20, 21-40, and 41-80 µg/dL, respectively).
  • Exposure-response correlations were analyzed using blood lead, ZPP, and urinary ALA levels.

Main Results:

  • Workers in the high blood lead concentration group exhibited significant impairment across most cognitive tasks.
  • Impairment magnitude correlated more strongly with blood lead concentration than with ZPP or urinary ALA.
  • A general slowing of sensorimotor reaction time was observed, largely independent of the cognitive task.
  • Mild impairments in attention, verbal memory, and linguistic processing were also noted in highly exposed individuals.

Conclusions:

  • High occupational lead exposure leads to clear impairment of sensorimotor functions.
  • The observed cognitive deficits, particularly slowed reaction times, may explain previous reports of widespread cognitive impairment in lead-exposed workers.
  • Blood lead concentration is a more reliable indicator of cognitive impairment than ZPP or urinary ALA in this population.