Summary Objectives. — The purpose of this study was to investigate the effects of intrasession sequencing of concurrent resistance and endurance training on the serum leptin, testosterone, cortisol responses and body composition in obese men. Patients and methods. — Thirty obese young men students (age = 23.2 ± 1.4 year, BMI = 31.8 ± 1.6 kg/m2) were randomly divided into three groups: concurrent resistance-endurance (CRE, n = 10) group, concurrent endurance-resistance (CER, n = 10) group and control (C, n = 10) group (no training program). Concurrent training groups (CER and CRE) were conducted three times a week on alternate days for 8 weeks, which consisted of running with 70—75% of maximal heart rate (HRmax) for 10 minutes which gradually increased to 80% HRmax for 21.5 minutes and the resistance training consisted of 3 sets of 8 repetitions at 80% of 1 repetition maximum (1RM) in 5 resistance exercises (leg extensions, lying leg curl, triceps pushdown, bench press and lateral pull down). Five minutes recovery duration was set between resistance and endurance phases. To measure hormonal and body composition changes, blood sampling was conducted 48 hours before the start of the course and again 48 hours after the last training session.
