Effects of small-sided games combined with high-intensity interval training versus high-intensity interval training alone on physical fitness of youth soccer players

Abstract

Introduction. Small-sided games (SSGs) and running-based high-intensity interval training (HIIT) are training methods that has been used in combination or isolation to improve performance of soccer players. Aim of Study. This study aimed to compare the effects of an eight-week training intervention using SSGs combined with running-based HIIT versus running-based HIIT alone on the physical fitness of young male soccer players. Material and Methods. Thirty-six young male soccer players (aged 14.0 ± 1.1 years) participated in the study. Both intervention groups completed an eight-week training protocol with two sessions per week. The SSGs + HIIT group used different SSGs formats (e.g., 5 vs 5) in combination with running-based HIIT. In contrast, the HIIT group performed running-based HIIT alone. Pre-and post-intervention 10 m and 30 m linear sprint (i.e., acceleration and maximal speed), aerobic capacity, body fat percentage (%BF), and change of direction (COD) were measured, using validated tests. Results. The HIIT and SSGs + HIIT interventions showed no significant differences in improving 10 m linear sprint (HIIT: 6.3% vs SSGs + HIIT: 7.4%), 30 m linear sprint (HIIT: 3.4% vs SSGs + HIIT: 4.2%), and %BF (HIIT: 11.6% vs SSGs + HIIT: 7.3%; p > 0.05). However, SSGs + HIIT induced significantly greater improvements in maximal oxygen consumption (HIIT: 6.7% vs SSGs + HIIT: 9.1%; p = 0.003) and COD (HIIT: 4% vs SSGs + HIIT: 1.9%; p = 0.002) compared to the HIIT group. Conclusions. The findings suggest that the SSGs + HIIT intervention was more effective in improving aerobic performance and COD among young soccer players. However, both training interventions were similarly effective in improving the 10 m and 30 m linear sprint times. © 2025, University School of Physical Education. All rights reserved.