Self-confidence and affect responses to short-term sprint interval training

Thirty elite soccer players in the first football league (age: 17.8 ± 0.9 years) volunteered to participate in this study. They were randomly assigned to one of two groups: a repeated sprint training group (RST-G; n = 15) and a control group (CON-G; n = 15). RST-G participated in 6 weeks of intensive training based on RS (6 × (20 + 20 m) runs, with 20 s passive recovery interval between sprints, 3 times/week). Before and after the 6-week intervention, all participants performed a RSA test and completed a Competitive Scale Anxiety Inventory (CSAI-2) and the RPE. After training RST-G showed a very significant (p < 0.000) increase in RSA total time performance relative to controls. Despite the faster sprint pace, the RPE also decreased significantly (p < 0.005) in RST-G, and their self confidence was significantly greater (p < 0.01), while the cognitive (p < 0.01) and somatic (p < 0.000) components of their anxiety state decreased. When practiced regularly, short bouts of sprint exercises improve anaerobic performance associated with a reduction in anxiety state and an increase in SC which may probably boost competitive performance.