ABSTRACT Regression analysis was used to estimate and test for relationships between urinary pesticide metabolites and neurobehavioral test performance in adults, 20 to 59 years old, participating in the third National Health and Nutrition Examination Survey. The 12 pesticide metabolites included 2 naphthols, 8 phenols, a phenoxyacetic acid, and a pyridinol. The 3 neurobehavioral tests included in the survey were simple reaction time, symbol-digit substitution, and serial digit learning. As the 2,4-dichlorophenol, 2,5-dichlorophenol, and the pentachlorophenol concentrations increased, performance on the serial digit learning test improved. As the 2,5-dichlorophenol concentration increased, performance on the symbol-digit substitution test improved. At low concentrations, the parent compounds of these metabolites may act at acetylcholine and γ-aminobutyric acid synapses in the central nervous system to improve neurobehavioral test performance.
[Show abstract][Hide abstract] ABSTRACT: Neurotoxicants present in water supply may affect human functions in terms of attention, response speed and perceptual motor speed. Neurobehavioural performance can be influenced by gender, age and education levels. This study aims to assess the neurobehavioral performance of palm oil estate residents with private water supply in southern Peninsular of Malaysia.
A total of 287 and 246 participants from estates with private (PWS) and public water supply (PUB) were recruited to complete a demographic and subjective symptom questionnaire followed by the Neurobehavioral Core Test Battery (NCTB).
PWS participants who consumed privately-treated water performed poorly in all NCTB tests compared to PUB participants except for Santa Ana test. Significant group differences in neurobehavioral performance were found for Digit Span Backward (P=0.047), Benton Visual Retention (P=0.006) and Trail Making B tests (P<0.05); which measures the function of memory, attention and visual perception-conceptual. Gender, age and years of education influenced the NCTB scores (P<0.05). Female participants performed poorly in tests measuring latency but excellently tackled those tests that determined association. Younger participants from both PWS and PUB performed better on NCTB tests when compared to other age groups (P<0.05). PWS and PUB participants in this study who received a longer duration of education excelled in the NCTB tests (P=0.000).
Poor neurobehavioral performance is associated with low water supply quality which affects neurofunctions in terms of attention, memory, response and perceptual motor speed.
Iranian Journal of Public Health 12/2013; 42(12). · 0.55 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: While the environmental exposure to multiple volatile organic compounds (VOCs) is ubiquitous, its neurobehavioral effects are not well understood. We assessed the associations between short-term exposure to VOC mixtures and neurobehavioral test performances on 497 participants in the Third National Health and Nutrition Examination Survey, using quantile and ordinary least squares regression models. We grouped 10 blood VOCs into 3 mixtures based on the principal component analysis, where Mix1 included benzene, toluene, ethylbenzene, m-/p-xylene, o-xylene, and styrene; Mix2 included chloroform and tetrachloroethene; and Mix3 included 1,1,1-trichloroethane and 1,4-dichlorobenzene. We found a general lack of significant adverse effects with exceptions limited to those with the worst performance (i.e. the top 10 percent) in the simple reaction time test, suggesting that these people were potentially more susceptible to impacts of VOC mixtures. However, further research is needed to clarify the neurobehavioral effects of chronic low-level exposure to VOC mixtures among the general population.
International Journal of Environmental Health Research 08/2014; 25(4):1-15. DOI:10.1080/09603123.2014.945514 · 1.57 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Farmworkers experience significant work-related health risks including pesticide-associated cognitive impairment. Practice effect is a surrogate for learning ability. This study examined differences in cognitive function and learning capacity in Latino farmworkers and nonfarmworkers.
Tasks of learning and short-term memory, executive function and working memory, perceptual coding, and psychomotor function were assessed at baseline and 3-month follow-up in 136 farmworkers and 116 nonfarmworkers.
Farmworkers had better performance on visuospatial learning and short-term memory at baseline (P < 0.05). Nevertheless, nonfarmworkers showed more practice effects, or improvement on cognitive performance, at 3-month follow-up relative to farmworkers. Furthermore, the amount of improvement on visuospatial learning ability, short-term visuospatial memory, and perceptual coding ability was significantly higher in nonfarmworkers than in farmworkers.
Practice effects may serve as an additional cognitive readout to differentiate healthy individuals from those with cognitive impairment.
Journal of occupational and environmental medicine / American College of Occupational and Environmental Medicine 03/2015; 57(6). DOI:10.1097/JOM.0000000000000424 · 1.63 Impact Factor
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