摘要：Current life-style of all age categories of common population and a sedentary way of life without compensation by physical activity as a natural need of a human result in overweight and obesity, which are highly associated with the quality of life. Positive effects of physical activity are well known and described in scientific literature. However, differences of body composition indicators between health subject and well trained athletes in juvenile age are not well known. The aim of this study was to describe and compare the current profile of selected young athletes subjects and healthy male subjects base on body composition variables. The research group consisted of two 16 – years old male group from Czech Republic. The group 1 (Trained athletes): n = 57, age = 16.2 ± 0.6 years, body height = 177.21 ± 6.8 cm, body weight = 68.2 ± 10.8 kg) and the group 2(healthy male subject): (n = 65, age = 16.0 ± 0.3 years, body height = 172.2 ± 6.5 cm, body weight = 65.2 ± 10.8 kg). Body composition variables (percentage of fat mass - FM), lean body mass (LBM) and ratio of extracellular to intracellular mass (ECM/BCM) was measured with the whole-body bioelectrical-impedance analysis method (BIA 2 000 M, Data Input GmbH, Germany). The results revealed that body fat mass in well trained athletes (9.85 ± 1.98 %) was significant lower compare to and healthy male subjects 17.27 ± 4.57 % (t 120 = -11.34; p<0.01. The similarly ECM/BCM ratio was significant lower in athletes (0.79 ± 0.09) compare to healthy subjects (0.94 ± 0.12) (t 120 = -7.52; p<0.01). We found out significant differences (t 120 = 5.00; p<0.01) in lean body mass in athletes (61.28 ± 5.96 kg) compare to non-athletes (55.09 ± 7.49 kg), but body mass index were not significant (t 120 = 0.33; p>0.05) between compared groups (athletes: 21.64 ± 1.56 kg.m -2 , healthy subjects: 21.46 ± 3.76 kg.m -2 ).Optimal body composition is advisable as a predictor of movement and determinant of individual's quality of life.Sedentary way of life leads to reduction of lean body mass and increasing of fat mass as well as ECM/BCM ratio in juvenile male subjects.
关键词：anthropometry; body fat percentage; fitness; testing; bioelectrical-impedance analysis
