Objective: High-intensity interval training (HIT) is an efficient means of improving performance in a short period of time. The effects of HIT program on performance, physiological and resting levels of growth hormone (GH), IGF-1,IGFBP-3 and Cortisol in elite athletes are not well known.
Methods: So, the present study was conducted to show the effect of four weeks HIT on some functional and hormonal variables. For this purpose, fourteen Iranian volunteer players in nationalB basketball team (Mean±SD, age=23.0±3.24, weigth=63.6±8.50, BMI=21.8±3.15) were selected and were randomly divided into two groups of experimental (EXP: n=7) and control (CON: n=7).Before and after training, the subjects performed (a) a graded exercise test, and (b) a Wingate test for determining Peak Power Output (PPO) and Mean Power Output (MPO). Both groups followed the same basketball training program for four weeks. Additionally, the EXP group performed a Running-based Anaerobic Sprint Test (RAST) (six 35-m runs at maximum pace with a 10-second recovery between each run) as a HIT protocol for four weeks, two sessions per week .Statistical analysis was done by analysis of covariance (ANCOVA), using SPSS 16, and P<0.05 was considered significant .
Results: According to the results of ANCOVA test, EXP group showed significant improvement in VO2 max (P=0.001), vLT (P=0.011) and vVO2 max (P=0.001). The training program led to significant increases in PPO (P=0.03) and MPO (P=0.02).
Conclusion: The current findings suggest that HIT program with short recovery can increase both aerobic and anaerobic performances.