Effectiveness of Progressive-Load Respiratory Muscle Training on Repeated Sprint Ability in Youth Soccer Players Aged 15–17 Years

Abstract

This study examined the effectiveness of a progressive-load respiratory muscle training program on repeated sprint ability and selected physiological variables in youth soccer players aged 15 to 17 years. A quasi-experimental design was used with 30 players randomly assigned to an experimental group that performed respiratory muscle training in addition to regular training and a control group that continued regular training only. The intervention lasted 8 weeks with training loads ranging from 40 % to 80 % of maximal inspiratory pressure. Measurements included maximal inspiratory and expiratory pressures, repeated sprint performance indices, the YoYo IR1 test, rating of perceived exertion, and blood lactate concentration. The findings showed significant improvements in respiratory muscle strength, repeated sprint performance, fatigue index, and intermittent aerobic capacity in the experimental group, along with a reduction in perceived exertion, whereas changes in the control group were minimal. A significant negative relationship was also observed between changes in maximal inspiratory pressure and changes in mean repeated sprint time. The results support the integration of progressive respiratory muscle training as an effective and practical strategy to enhance physical performance in youth soccer players.