ABSTRACT
Abstract Infrared thermography (IRT) has been used to assess skin temperature (Tsk), especially during the COVID-19 pandemic, as an important tool in medical screening not only of the general population, but also of young athletes. However, the subcutaneous adipose tissue can act as an insulator when the Tsk is assessed by IRT, modifying the normal Tsk data and leading to their misinterpretation. Considering that the body mass index (BMI) is an important predictor of obesity, the objective of this study was to verify if the Tsk measured by IRT is affected by the BMI in adolescents. A preliminary study was carried out being four participants intentionally selected, all 16 years old, each one classified in a different BMI range according to the criteria of the World Health Organization for the adolescent population: underweight, healthy weight, overweight and obesity. Four thermograms of each participant were recorded and the ThermoHuman® software was used to evaluate 82 regions of interest (ROI), which were integrated into 6 body regions. Using healthy weight subjects as a reference, it was found a progressive reduction in Tsk in all ROI compared to overweight and obese participants, with emphasis on the anterior region of the trunk (3.04% and 6.69% less respectively), and an increase in the Tsk of all body regions for the underweight subject. There are indications that BMI can influence the Tsk value in adolescents and should be taken into account when analyzing thermograms for a correct evaluation of thermal normality.
Resumo A termografia infravermelha (TI) tem sido uma técnica empregada para avaliar a temperatura da pele (TP), especialmente durante a pandemia do COVID-19. Contudo, existem indicações que o tecido adiposo subcutâneo pode agir como uma camada isolante, alterando o comportamento da TP, o que pode dificultar a interpretação da normalidade térmica. Tendo em vista que o índice de massa corporal (IMC) é considerado um importante preditor de obesidade, o objetivo deste estudo foi verificar se a TP sofre interferência de diferentes classificações de IMC em adolescentes. Foram selecionados 4 participantes de maneira intencional, todos com 16 anos, cada um foi classificado em uma diferente faixa de IMC para população de adolescentes segundo a classificação proposta pela Organização Mundial de Saúde para essa idade: baixo peso, peso normal, sobrepeso e obesidade. Foram feitos quatro termogramas, avaliados no software ThermoHuman®, que avalia 82 regiões corporais de interesse (RCI), que foram integradas em 6 regiões corporais. Utilizando os indivíduos com peso normal como referência, foi encontrada uma redução progressiva na TP comparada aos participantes com sobrepeso e obesidade, com ênfase para a região anterior de tronco (3.04% e 6.69% menores, respectivamente), e um aumento na TP de todas as regiões corporais comparadas ao sujeito com baixo peso. Isso indica que o IMC pode influenciar nos valores da TP em adolescentes e deve ser levado em consideração para uma avaliação correta da normalidade térmica.
ABSTRACT
La obesidad es un problema de la salud pública que disminuye la esperanza de vida y genera altos costos sociales y económicos. La tendencia ha sido creciente a nivel mundial con un aumento superior al 75% en los últimos años. El objetivo fue relacionar el metabolismo basal con niveles séricos de proteína C reactiva ultrasensible y variables antropométricas en adolescentes. Se trata de un estudio correlacional, con un diseño no experimental. La muestra fue no probabilística, participaron 33 adolescentes, 13 mujeres y 20 hombres entre 12 a 16 años, entre mayo y diciembre de 2018. Se midió el metabolismo basal, actividad física, variables antropométricas y niveles de proteína C reactiva ultrasensible. Los datos fueron analizados con estadística descriptiva e inferencial y se utilizó el coeficiente de correlación lineal de Pearson, con un nivel de significancia <0,05. Se encontró 66,7% de sobrepeso y obesidad, calculado con el índice de masa corporal, (según puntaje Z ≥ 1). El 78,8% de la muestra presentó un porcentaje de grasa corporal elevado, la proteína C reactiva se encontró elevada en el 18,2% de la muestra, con un promedio de 2,0 mg/dl y, la correlación entre el metabolismo basal y la proteína C reactiva ultrasensible obtuvo un valor r=0,18 y un valor p=0,63. Se concluye que en este grupo de adolescentes la correlación entre el metabolismo basal y la proteína C reactiva ultrasensible fue débil, sin embargo, existe una moderada asociación entre el metabolismo basal y el porcentaje de masa magra, reafirmando la importancia de este tejido como un órgano metabólico activo(AU)
Obesity is a public health problem that decreases life expectancy and generates high social and economic costs. The trend has been increasing worldwide with an increase of over 75% in recent years. The objective was to relate the basal metabolism with serum levels of ultrasensitive C-reactive protein and anthropometric variables in adolescent subjects. It is a correlational study, with a non-experimental design. A non-probabilistic sample of 33 adolescents, 13 women and 20 men, between 12 and 16 years old, were evaluated between the months of May to December 2018. Basal metabolism, physical activity, anthropometric variables and levels of ultrasensitive C-reactive protein were measured. The data were analyzed with descriptive and inferential statistics; Pearson's linear correlation coefficient was used, with a level of significance <0.05. A 66.7% of overweight and obesity was found, calculated with the body mass index, (according to Z score ≥ 1). 78.8% of the sample presented a high percentage of body fat, C-reactive protein was found high in 18.2% of the sample, with an average of 2.0 mg/dl and, the correlation between metabolism baseline and the ultrasensitive C-reactive protein obtained a value r = 0.18 and a value p = 0.63. It is concluded that in this group of adolescents the correlation between basal metabolism and ultrasensitive C-reactive protein was weak; however, there is a moderate association between basal metabolism and lean mass percentage, reaffirming the importance of this tissue as an organ active metabolic(AU)