[Anthropometric assessment and school achievement in school-age children from high school in Valparaiso, Chile]. / Evaluación antropométrica y rendimiento escolar en estudiantes de educación media de Valparaíso, Chile.

The purpose of this study was to determine the interrelationship between nutritional status and scholastic achievement (SA). The total population included 1,488 high school students from Valparaíso, City, V Region of Chile. A representative sample of 165 school-age children was chosen from public schools in which the Improvement Education Quality Program (MECE) from the Ministry of Education of Chile was tried. Socioeconomic status (SES) was measured by means of the Graffar's modified method. Nutritional status was assessed through anthropometric measurements of weight (W), height (T), head circumference (HC), arm circumference (AC) and triceps skindfold (TS). SA was determined by a language (SAL) and mathematics (SAM) test. Statistical analysis included analysis of variance, correlation multiple regression and chi-square. Results showed that HC is the anthropometric parameter with the greatest explanatory power in SA variance, in high school graduates (r2 = 0.7697), both SAL (r2 = 0.9258) and SAM (r2 = 0.5268), with a RR = 1.97. In this respect, 75% of school children with Z-HC values below median obtained a low percentage of achievement in the SA test. Considering that HC is a direct indicator of nutritional background and indirect indicator of brain development, these findings increase the knowledge in this area and reveal the need to carry out further research related to the interrelationship SA-brain development.

[The impact of malnutrition on brain development, intelligence and school work performance]. / Algunas consideraciones sobre el impacto de la desnutricion en el desarrollo cerebral, inteligencia y rendimiento escolar.

The findings from several authors confirm that undernutrition at an early age affects brain growth and intellectual quotient. Most part of students with the lowest scholastic achievement scores present suboptimal head circumference (anthropometric indicator of past nutrition and brain development) and brain size. On the other hand, intellectual quotient measured through intelligence tests (Weschler-R, or the Raven Progressives Matrices Test) has been described positively and significantly correlated with brain size measured by magnetic resonance imaging (MRI); in this respect, intellectual ability has been recognized as one of the best predictors of scholastic achievement. Considering that education is the change lever for the improvement of the quality of life and that the absolute numbers of undernourished children have been increasing in the world, is of major relevance to analyse the long-term effects of undernutrition at an early age. The investigations related to the interrelationships between nutritional status, brain development, intelligence and scholastic achievement are of greatest importance, since nutritional problems affect the lowest socioeconomic stratum with negative consequences manifested in school-age, in higher levels of school dropout, learning problems and a low percentage of students enrolling into higher education. This limits the development of people by which a clear economic benefit to increase adult productivity for government policies might be successful preventing childhood malnutrition.

Changes of somatotype in high school students, V region, Chile: 1985-2010.

OBJECTIVE: To determine the trend of high school students from Valparaíso Chile by means of an anthropometrical somatotype. MATERIAL AND METHODS: two samples of students during the years 1984-1985 (86 men and 71 women) and 2009-2010 (77 men and 86 women) between 15 and 18 years of age have been studied. Somatotype was estimated by the Heath-Carter anthropometric method. RESULTS: significant differences were found in all the variables of the somatotype during the periods studied (p < 0.01), except for height (p = 0.176) and humeral breadth in women (p = 0.067). Important distinctions were also found in the endomorphic, mesomorphic and ectomorphic components (p < 0.01). Men measurements registered remarkable differences in all the variables (p < 0.01), with the exception of weight (p = 0.156), calf breadth (p = 0.906) and arm breadth in contraction (p = 0.284). Measurement results of endomorphic (p < 0.01), ectomorphic (p < 0.01) and mesomorfic components (p < 0.05) revealed considerable differences. During the period 1984-1985, men classified as balanced mesomorph 2.7-4.8-3.1 which switched to mesomorph-endomorph 3.8-4.3-2.5 in the period 2009-2010. And the population of women in the 1984-1985 period is classified as mesomorph-endomorph 4.2-4.7-2.1 and changes to a mesomorphic-endomorph biotype 6.6-4.1-1.3 in the 2009-2010. CONCLUSIONS: the somatotype of the adolescent population, especially women in Valparaiso, Chile has changed to a predominant endomorphic biotype, and its mesomorphic component has decreased. A high relative adiposity contributes to increase the probability for these people to suffer non-transmissible chronic diseases and cardiovascular issues.