RESUMOO presente trabalho avaliou os efeitos da administração de duas diferentes quantidades de melão sobre variáveis hemogasométricas, bioquímicas e hematológicas de ovinos não adaptados. Foram utilizados 12 ovinos canulados, pesando 25kg de peso vivo, que nunca receberam ração concentrada. Os animais receberam dieta à base de feno (2,3% do peso vivo) e água à vontade. Os ovinos foram distribuídos aleatoriamente em dois grupos e receberam 25% ou 75% da matéria seca (MS) da dieta de melão triturado (G25% e G75%, respectivamente) diretamente no rúmen. Foram realizadas coletas de sangue e determinação do pH ruminal nos seguintes tempos: zero, 3, 6, 12, 18 e 24 horas após oferecimento do melão. Foi realizada análise hemogasométrica, do volume globular, determinação da concentração plasmática de lactato-L, glicose e osmolaridade sérica. No G25%, o pH sanguíneo variou entre 7,40 e 7,31, enquanto o G75% apresentou pH entre 7,38 e 7,26. Maiores concentrações de glicose plasmática foram detectadas no G75% no T3, T6 e T12 (P<0,05). Os ovinos que receberam 25% de melão mantiveram parâmetros sanguíneos dentro da normalidade, ao passo que, no G75%, os ovinos apresentaram discreta acidose metabólica sistêmica e hiperglicemia. A suplementação com 25% de melão pode ser uma alternativa segura na alimentação de ovinos.

ABSTRACTThis study evaluated the effects of two different amounts of melon on blood gas, biochemical and hematological variables of sheep not adapted. We used 12 cannulated sheep weighing 25 kg which never received concentrate. The animals received hay-based diet (2.3% of body weight) and water ad libitum. The sheep were randomly divided into two groups and received 25% or 75% of the dry matter (DM) of the diet of crushed melon (G25% and G75%, respectively) directly into the rumen. Blood collection and determination of ruminal pH were made at the following times: zero, three, six, 12, 18 and 24 hours after administration of the fruit. In whole blood was performed blood gas analysis and packed cell volume; in the plasma it was determined the concentrations of L-Lactate and glucose and in the serum the osmolarity. At G25% the blood pH ranged between 7.40 and 7.31, while G75% showed pH between 7.38 and 7.26. Higher concentrations of plasma glucose were detected in G75% after 3, 6 and 12 hours (P <0.05). Sheep receiving 25% of melon showed blood parameters within the normal range, while in the G75%, sheep had a mild systemic metabolic acidosis and hyperglycemia.

Objectives: to assess the accuracy of the two most used anthropometric criteria: Must and Cole to diagnose obesity in adolescence comparing with percentage of fat mass determined by DXA. Methodology: cross-sectional study with 418 adolescents (52.4% males) attending a private school in São Paulo/Brazil. Anthropometric measures of height and weight were taken and BMI was calculated. Analysis of body composition was performed using the DXA to detect percentage of fat mass. Using the method proposed by Ellis & Wong (ERM) two sex-specific linear regression models of fat percentage for age in years were fitted. The comparison between the methods was carried out through the analyses of specificity and sensitivity with two residual percentiles as cutoff points (ERM85th and ERM95th) as standards. A logistic model was fitted to estimate the probability curves of obesity classification. Results: the comparison of the two classic criteria for the diagnosis of obesity with the ERM85th and ERM 95th, yields for females the same sensitivities of 0.50 and 0.20 for both criteria. For males sensitivities for ERM 85th were 0.61(Must) and 0.49 (Cole); while for ERM95th the sensitivities were 0.81 (Must) and 0.64 (Cole). Therefore, there are high probabilities that those criteria diagnose adolescents as obese, when actually they are not. Conclusion: the Must and Cole criteria were similar and present flaws for the diagnosis of obesity. In clinical practice and field studies anthropometric criteria should be evaluated as to the diagnostic accuracy along with other clinical parameters and, when feasible, the analysis of fatness percentage. However, the anthropometric criteria evaluated are efficient in the identification of nonobese adolescent in the two cutoff points considered.

Objetivos: valorar la precisión de dos de los criterios antropométricos más utilizados, los de Must y los de Cole, para diagnosticar la obesidad en adolescentes comparando el porcentaje de masa grasa determinada por DXA. Metodología: estudio transversal sobre 418 adolescentes (52,4% varones) de un colegio privado de Sao Paulo (Brasil). Se tomaron las medidas antropométricas peso y talla, y se calculó el IMC. Se realizó el análisis de la composición corporal utilizando DXA para detectar el porcentaje de masa grasa. Utilizando el método propuesto por Ellis y Wong (ERM), se crearon dos modelos de regresión linear específicos para el sexo para el porcentaje de grasa en relación con la edad (años). Se realizó la comparación entre ambos métodos mediante el análisis de especificidad y sensibilidad con dos percentiles residuales (Percentil 85 del ERM (ERM85) y percentil 95 del ERM (ERM95)) como puntos de corte estándar. Se ajustó un modelo logístico para estimar las curvas de probabilidad de la clasificación de la obesidad. Resultados: la comparación de los dos criterios clásicos del diagnóstico de la obesidad con el ERM85 y el ERM95 muestra, para las mujeres, las mismas sensibilidades, de 0,50 y 0,20, para ambos criterios. Para los hombres, las sensibilidades del ERM85 fueron 0,61 (Must) y 0,49 (Cole), mientras que las del ERM95 fueron 0,81 (Must) y 0,64 (Cole). Por lo tanto, la probabilidad de que estos dos criterios diagnostiquen la obesidad en adolescentes es elevada cuando realmente no lo son. Conclusión: los criterios de Must y los de Cole fueron similares y presentan fallos en el diagnóstico de la obesidad. En la práctica clínica y los estudios de campo, los criterios antropométricos deberían evaluarse en relación con la precisión diagnóstica junto con otros parámetros clínicos y, cuando sea posible, el análisis del porcentaje de adiposidad. Sin embargo, los criterios antropométricos evaluados son eficaces para la identificación de los adolescentes no obesos con los dos puntos de corte considerados.