Aims: Following the sport activities, the blood homeostasis system, being affected by fibrinolysis and coagulation factors, is changed. The aim of this study was to investigate the effects of high-intensity interval and concurrent (aerobic-resistance) long-term sport courses on the blood fibrinolysis and coagulation parameters in healthy non-athlete young persons.

Materials & Methods: In the semi-experimental study, 30 healthy non-athlete young men were studied in Saqez in 2014. The subjects, selected via simple available sampling method, were randomly divided into three groups including concurrent (aerobic-resistance) trainings, high-intensity interval trainings, and control groups. 8-week trainings (3 times a week) were conducted in both concurrent and high-intensity interval groups. Blood sampling was done before the first session and 30 minutes after the last training session. Data was analyzed by SPSS 19 software using dependent T, one-way ANOVA, and Tukey’s post-hoc tests.

Findings: After the training intervention, the number of platelits and the fibrinogen level significantly decreased in concurrent group. In addition, prothrombin time in high-intensity interval group and the D-dimer level in both training groups significantly increased (p<0.05). The D-dimer concentrations in control and high-intensity interval groups were significantly different. In addition, the number of platelets in concurrent group was significantly different from both control and high-intensity interval groups (p<0.05).

Conclusion: 8-week high-intensity interval and concurrent trainings reduce the promoter coagulation activity in the helthy non-athlete young men, while increase the fibrinolytic activity.