High-intensity interval training improves the reactive strength index and motor ability of youth football players.

However, despite these favourable within-group changes, between-group post-test comparisons did not reach statistical significance. Conclusions This study revealed that a 4-week HIIT intervention applied to youth male football players had positive effects on the RSI and motor abilities, as evidenced by large within-group improvements and significant group × time interactions, despite the absence of statistically significant between-group post-test differences.

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