摘要：This study was conducted on a sample of 136 students (94 students from the 6th grade and 42 students from the 7th grade) with an average age of 11.56 years old. The aim of this study was to determine the degree and differences in the degree of nutrition and body composition of students from 6th and 7th grades in elementary school. Based on the obtained results,using the T-test for small independent samples,it was determined that there are statistically significant differences between students from 6th and 7th grades both in the degree of nutrition and body composition,which were estimated by 34 variables using a bioelectric impedance instrument (InBody 720). It was determined that out of the total of 94 (69.1%) students from the 6th grade,27 of them (28.7%) had an excessive body weight;18 (19.1%) were obese;48 (51.1%) students from the 6th grade had a normal body weight,and 1 (1.1%) student from the 6th grade belonged to the malnourished category. Out of the total of 42 (30.9%) students from the 7th grade,15 of them (35.7%) have an excessive body weight;7 (16.7%) were obese;20 (47.6%) students from the 7th grade had a normal body weight,and there were no malnourished students. On average,students from the 7th grade had higher values of the total body fluid in the body,presence of proteins,minerals,bone minerals,lean tissue,muscle mass,skeletal muscle mass,body mass index,muscle mass in left and right arms and trunk,muscle mass and its percentual representation in lower extremities,target weight,and muscle control compared to the 6th grade students. The obtained data indicate the problems that currently exist;these problems are conditioned by bad habits and lifestyle. Modern society is characterized by markedly reduced motor activity,improper diet,and an increasing number of people whose lifestyle can be described as "sedentary". It is necessary to act preventively by more frequently monitoring and analyzing proper growth and development and by motivating students to get involved in sports actively or recreationally. In most cases,proper habits that are adopted in childhood remain at other stages of development.
关键词：body composition;body mass index;elementary school age;health;obesity
