Comparison of the responses of testosterone, cortisol and creatine kinase in two types of resistance training with and without blood flow restriction in adolescent gymnast boys

The purpose of this study was to compare the responses of testosterone, cortisol and creatine kinase in two types of resistance training with and without blood flow restriction. For this purpose, 36 adolescent gymnast boys aged 10 to 14 years participated in a quasi-experimental research design. The subjects (weight 37.11 ± 8.11 kg, height 145.16 ± 11.58 cm, body mass index 17.40 ± 1.77 kg/m2) were randomly divided into three groups; control (n=12), traditional resistance training (n=12), and resistance exercise with blood flow restriction (n=12), respectively. Training protocol includes three motions included leg extension, elbow flexion and bench press. The results of intergroup showed that a variable testosterone after acute exercise in traditional resistance training groups (p=0.653) and resistance exercise with blood flow restriction (p=0.107), was not significant. But changing of cortisol in both groups, traditional resistance training groups (p=0.015) and resistance exercise with blood flow restriction (p=0.015), was significant. creatine kinase increased significantly only in traditional resistance training group (p=0.001). The results showed that in both of them protocol, there was no significant difference between groups in levels of testosterone and cortisol, but in varying creatine kinase was significantly different (p=0.05).