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ZUANETTI, P. A. Consequences of childhood obesity in cognitive skills involved in learning of written language. 2015. 101f. PhD thesis – Faculty of Philosophy, Sciences and Letters of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, 2015. Introduction: The rising of obesity rates in childhood has deserved attention as a healthy public problem due to the impact caused in the lives of children by various metabolic and other diseases, causing social, economic and psychological consequences. However, only in recent years the studies aiming the link between obesity in children and cognition has begun. Objective: Evaluate the different cognitive skills involved in the written language in children diagnosed with childhood obesity. Methods and Materials: 41 children (age average: 9,6 years old) participated of this study. The children were divided in groups according to nutritional status: G1 (n = 14) children diagnosed with obesity and with history of overweight / obese since three years or less, and G2 (n = 27) normal weight (matched by age and type of school). Audiological evaluation (thresholds between 250Hz and 16,000Hz) was performed in both groups after evaluation of medical historical data and level of physical activity. Tests involving reading words and pseudo words, arithmetic, writing under dictation, phonological awareness, rapid automatized naming, phonological working memory, visuospatial working memory, attention (cancellation test) and cognitive flexibility (trail making test) were performed . The Proportions Equality, Manny-Whitney and Manova Non-Parametric α = 0.05 tests were used for statistical analysis. Results: The groups were homogeneous considering the history prenatal and perinatal complications and history of seizures / ear infections / anemia besides the both groups presented low level of physical activity. There were no differences in school performance tests involving reading / writing / arithmetic. However, G1 presented difficulty to alternate the phonological and lexical routes in tests involving the use of reading routes, so indicating difficulties in cognitive flexibility. This difficulty was confirmed by the results obtained in trail making and alternating attention tests, even while maintaining a good performance in pure tests of attention. No differences were observed between groups in rapid automatized naming and visuospatial working memory tests. G1 presented the best performance in tasks involving phonological working memory. The thresholds of hearing were considered present in normal range for both groups in the hearing tests. However G1 presented thresholds of hearing higher in low frequencies (250hz a 4000hz). Conclusion: This study showed that childhood obesity can change cognitive performance in children. Positive effects on phonological working memory and in some phonological awareness tasks were observed. However, negative effects were observed in tasks involving cognitive flexibility and alternating attention which interfered in the processing of written language and in the ability to alternate reading routes. In general the school performance were similar in both groups, however other cognitive resources that assist in their learning may have been required.

Consequências da obesidade infantil nas habilidades cognitivas envolvidas na aprendizagem da linguagem escrita