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A total of twenty-six youth male soccer players, aged 16.5\u2009\u00b1\u20090.32\u00a0years, with 3.4\u2009\u00b1\u20091.1\u00a0years of experience, voluntarily participated in the study. These players belonged to two regional-level tier 2 teams (trained\/developmental). In the initial week of observation, the 30\u201315 Intermittent Fitness Test was implemented to measure the final velocity (VIFT) achieved by the players. Subsequently, the 5v5 format of play was conducted twice a week over two consecutive weeks, during which heart rate responses and locomotor demands were measured. The Pearson product-moment correlation test revealed a significant correlation between VIFT and the total distance covered during the 5v5 format (r\u2009=\u20090.471 [95% CI: 0.093; 0.721], <jats:italic>p<\/jats:italic>\u2009=\u20090.015). Conversely, small and non-significant correlations were identified between VIFT and mean heart rate (r\u2009=\u20090.280 [95% CI: \u2212\u20090.126; 0.598]; <jats:italic>p<\/jats:italic>\u2009=\u20090.166), VIFT and peak heart rate (r\u2009=\u20090.237 [95% CI: \u2212\u20090.170; 0.569]; <jats:italic>p<\/jats:italic>\u2009=\u20090.243), as well as VIFT and high-speed running (r\u2009=\u20090.254 [95% CI: \u2212\u20090.153; 0.580]; <jats:italic>p<\/jats:italic>\u2009=\u20090.211). Players with higher VIFT demonstrated a significantly greater total distance, with a large effect size (+\u20096.64%; <jats:italic>p<\/jats:italic>\u2009=\u20090.015; d\u2009=\u20091.033), compared to those with lower VIFT. Our findings suggest that improved performance in VIFT may lead to covering more distance in 5v5 matches. However, the lack of significant associations between VIFT and heart rate levels during SSGs suggests that they are not strongly correlated, possibly because VIFT is more closely linked to locomotor profile. As a practical implication, coaches may consider organizing players during SSGs based on their VIFT if the goal is to standardize locomotor demands.<\/jats:p>","DOI":"10.1038\/s41598-024-61468-7","type":"journal-article","created":{"date-parts":[[2024,5,14]],"date-time":"2024-05-14T06:01:59Z","timestamp":1715666519000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Higher final speed in 30\u201315 intermittent fitness tests correlates with soccer's locomotor demands, not heart rate responses in small-sided soccer games"],"prefix":"10.1038","volume":"14","author":[{"given":"YanXiu","family":"Quan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"YongXing","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"XiaoShuang","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qi","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,14]]},"reference":[{"key":"61468_CR1","doi-asserted-by":"publisher","first-page":"154","DOI":"10.1097\/JES.0b013e318292f3ec","volume":"41","author":"K Davids","year":"2013","unstructured":"Davids, K., Ara\u00fajo, D., Correia, V. & Vilar, L. 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