Comparing Individualized vs. Non-Individualized Locomotor Profiling on High-Intensity Interval Training Adaptations...

Area of Science:

• Sports Science
• Exercise Physiology
• Youth Athlete Training

Background:

• High-intensity interval training (HIIT) is widely used in youth soccer.
• Individualizing training based on player profiles may optimize adaptations.
• Comparing individualized HIIT, non-individualized HIIT, and repeated sprint training (RST) is crucial for understanding their effects.

Purpose of the Study:

• To compare the effects of individualized vs. non-individualized HIIT on aerobic, anaerobic, and neuromuscular adaptations in youth soccer players.
• To determine if locomotor profiles influence training outcomes.
• To assess the efficacy of HIIT and RST interventions.

Main Methods:

• 46 male youth soccer players participated in a 6-week, twice-weekly training intervention.
• Groups included: individualized HIIT (HIITind), long-interval HIIT (HIITlong), repeated sprint training (RST), and a control group.
• HIITind was tailored based on players' speed or endurance profiles (maximal sprint speed vs. maximal aerobic speed).

Main Results:

• All training groups showed significant improvements compared to the control.
• RST yielded superior gains in countermovement jump, maximal sprint speed, anaerobic speed reserve, and repeated sprint ability compared to HIITind and HIITlong.
• No significant differences were found between HIITind and HIITlong; however, both were more effective for aerobic capacity than RST.

Conclusions:

• While both individualized and non-individualized HIIT improve physical capacities, RST provides greater anaerobic and neuromuscular benefits for youth soccer players.
• HIIT protocols (individualized or long-interval) are more effective than RST for enhancing aerobic capacity.
• Locomotor profiles significantly influence maximal sprint speed and anaerobic speed reserve adaptations.