Dopsaj, Milivoj (35728402200)Milivoj (35728402200)DopsajĐorđević-Nikić, Marina (55756482500)Marina (55756482500)Đorđević-NikićMaksimović, M. (13613612200)M. (13613612200)Maksimović2025-06-122025-06-122016https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019877027&partnerID=40&md5=60ac926218e7fea1dc24e94f5c962e8ahttps://remedy.med.bg.ac.rs/handle/123456789/7909Physical inactivity is one of the key health risk factors, directly related to both the increase in prevalence of noncommunicable diseases and to the reduction in work ability and functional capacity in the general population. Another result of reduced physical activity is noticeable in the emerging pandemic of obesity. The main aim of this study was to define relations between physical activity and/or exercise, and characteristics of body composition in working-age population of both genders living in Belgrade, the capital city of Serbia. The sample included 4489 apparently healthy Serbian males (N = 3065) and females (N = 1424) aged 18 to 69.9 years. The total sample was divided into four groups with respect to the frequency of physical activity or exercise: Group 1 - Sedentary, with subjects who performed ≤ 1 exercise/physical activity sessions/week; Group 2 - Casual, with subjects who performed 2-3 exercise/physical activity sessions/week; Group 3 - Committed, with subjects who performed 4-5 exercise/physical activity sessions/week; and, Group 4 - Steady, with subjects who performed ≥6 exercise/physical activity sessions/week). Body composition was measured via multisegmental bioelectrical impedance analysis using InBody 720 Tetrapolar 8-Point Tactile Electrode System. The research study used eight variables to describe the body composition of the sample: body height (BH), body mass (BM); body mass index (BMI); fat free mass (FFM); body fat mass (BFM); percent of body fat (PBF); fat free mass index (FFMI); and, body fat mass index (BFMI). MANOVA, ANOVA and t-test were used to establish the differences among groups, while linear regression analysis was used to define the trends of change. The results obtained suggest that an increase in physical activity and exercise had positive effects on body structure. The results showed a greater impact of physical activity/exercise on the change in body composition in men than in women, with the average change trend in all variables in men higher by 27.04%, ranging between 5.35% in FFM to 59.07% in BM. Finally, the results may indicate that the minimal frequency of physical activity/exercise should be at least four times per week in both men and women, with the duration of between 274 and 307 min of exercise/physical activity per week, i.e., between 60 and 67 min of exercise/physical activity per session. © 2016 by Nova Science Publishers, Inc. All rights reserved.AdultsBioimpedanceBody compositionPhysical activityPhysical exercise