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Review of current evidence on the impact of pesticides, polychlorinated biphenyls and selected metals on attention deficit / hyperactivity disorder in children

100%
Polańska K., Jurewicz J., Hanke W.
International Journal of Occupational Medicine and Environmental Health
|
2013
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vol. 26
|
issue 1
16-38
EN
The aim of this review was to investigate the association between attention defi cit / hyperactivity disorder (ADHD) or ADHD- related symptoms and industrial chemicals, such as organophosphates and organochlorine pesticides, polychlorinated biphenyls (PCBs), lead, mercury and manganese. Medline, PubMed and EBSCO searches were performed to identify the studies that analyzed the association of prenatal and postnatal child exposure to such toxicants and ADHD or ADHD-related symptoms. The review is restricted to human studies published in English in peer-reviewed journals since 2000. Most of the presented studies focused on pesticides, PCB and lead. The impact of mercury and manganese was investigated less frequently. The fi ndings indicate that children’s exposure to organophosphate pesticides may cause symptoms consistent with pervasive developmental disorder, ADHD or attention problems. Exposures to organochlorine pesticides and PCBs were associated with ADHD-like behaviors such as alertness, quality of alert response, and cost of attention. The studies provided evidence that blood lead level below 10 μg/dl was associated with ADHD or ADHD-related symptoms. Information on the association between exposure to mercury and neurotoxicity is limited, and requires further confi rmation in future research. Two studies indicated that exposure to manganese is related to ADHD; such exposure and its impact on children neurodevelopment need to be further investigated. Future studies should use a prospective design with multiple biological samples collected over time for better assessment of exposure and its critical windows. Additionally, inclusion of potential confounding factors and co-exposures is crucial.
2
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Exposure to environmental and lifestyle factors and attention-deficit / hyperactivity disorder in children - A review of epidemiological studies

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Polańska K., Jurewicz J., Hanke W.
International Journal of Occupational Medicine and Environmental Health
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2012
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vol. 25
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issue 4
330-355
EN
Attention-defi cit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders in children. Although the mechanisms that lead to the development of ADHD remain unclear, genetic and environmental factors have been implicated. These include heavy metals and chemical exposures, nutritional and lifestyle/psychosocial factors. The aim of this review was to investigate the association between ADHD or ADHD-related symptoms and widespread environmental factors such as phthalates, bisphenol A (BPA), tobacco smoke, polycyclic aromatic hydrocarbons (PAHs), polyfl uoroalkyl chemicals (PFCs) and alcohol. Medline, PubMed and Ebsco search was performed to identify the studies which analyze the association of prenatal and postnatal child exposure to environmental toxicants and lifestyle factors and ADHD or ADHD-related symptoms. The review is restricted to human studies published since 2000 in English in peer reviewed journals. Despite much research has been done on the association between environmental risk factors and ADHD or ADHD symptoms, results are not consistent. Most studies in this fi eld, focused on exposure to tobacco smoke, found an association between that exposure and ADHD and ADHD symptoms. On the other hand, the impact of phthalates, BPA, PFCs, PAHs and alcohol is less frequently investigated and does not allow a fi rm conclusion regarding the association with the outcomes of interest.
3
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Heterogeneity in Clinical Symptoms and Cognitive Functioning of Children with Hyperactivity-Impulsivity and Inattention: Dimensional and Person-Centered Perspectives

86%
Gambin M. J., Święcicka M. J.
Polish Psychological Bulletin
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2016
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vol. 47
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issue 2
195-206
EN
The goal of this study was to investigate heterogeneity in clinical symptoms and cognitive functioning among children with hyperactivity-impulsivity and inattention using a novel approach that combined dimensional and person-centered perspectives. Executive, verbal and visuo-spatial functioning, hyperactivity-impulsivity, inattention, externalizing and internalizing symptoms were examined in 102 children (37 girls and 65 boys) at risk for ADHD and 62 children (31 girls and 31 boys) not at risk for ADHD in the age range of 8–10 years. We extracted seven groups with various profiles of psychopathological symptoms and cognitive functioning. We propose that symptoms of inattention and hyperactivity-impulsivity in these groups are related to different cognitive and affective-motivational problems.
4

Funkcjonowanie uwagi u dzieci w wieku wczesnoszkolnym: grupy ryzyka

58%
Nowotnik A.
Edukacja
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2012
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issue 1(117)
87-102
PL
Artykuł prezentuje wyniki badania, którego celem była diagnoza poziomu funkcjonowania uwagi dzieci w wieku wczesnoszkolnym (klasy I–III) i wyłonienie ewentualnych grup ryzyka. W badaniu przeprowadzonym w dwóch poznańskich szkołach podstawowych wzięło udział 256 dzieci (33% z klasy I, 31% z klasy II i 36% z klasy III). Pomiarom poddano parametry uwagi: koncentracja, spostrzegawczość, impulsywność, nieuważność oraz zdolność hamowania poznawczego. Do pomiaru hamowania poznawczego zastosowano trójkolorową wersję testu Stroopa. Pozostałe parametry zbadano za pomocą testu uwagi D2. Metoda k-średnich analizy skupień na przypadkach pozwoliła wyodrębnić pięć podgrup dzieci, które ze względu na profil uwagi nazwano: „przeciętni”, „skoncentrowani”, „nieskoordynowani”, „impulsywni” i „rozkojarzeni”. W skupieniu „przeciętni” większość stanowili uczniowie klasy I, zaś w skupieniu „skoncentrowani” – uczniowie klasy III. W skupieniu „impulsywni” znalazło się istotnie więcej dziewczynek.
EN
The main purpose of the paper was to analyse the characteristics of attention in early school children and to identify risk groups. The study involved 256 primary school children in grades I–III. First, second and third grade pupils made up 33%, 31% and 36% of the sample, respectively. Five attention measures (concentration, perception, impulsivity, inattention and cognitive inhibition) were investigated. The three-colour version of the Stroop Test (1935) was applied as the cognitive inhibition task. The D2 Test of Attention by R. Brickenkamp (Polish version by E. R. Dajek, 2003) was used to measure concentration, perceptual abilities, impulsiveness and inattention. The cluster analysis method of k-means was used. Five significantly different groups of children were identified, classified as: ‘uncoordinated’, ‘average’, ‘impulsive’, ‘focused’ and ‘distracted’. Only the ‘average’ and ‘focused’ revealed the significant dominance of certain age groups regarding concentration. In the case of ‘average’, most children were in grade I, while in the case of ‘focused’ most were in grade III. Significant gender differences were only shown with girls dominating as ‘impulsive’.
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