{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T17:45:30Z","timestamp":1772300730329,"version":"3.50.1"},"reference-count":35,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,4,10]],"date-time":"2025-04-10T00:00:00Z","timestamp":1744243200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Funda\u00e7\u00e3o Para a Ci\u00eancia e Tecnologia","award":["UIDB\/00617\/2020"],"award-info":[{"award-number":["UIDB\/00617\/2020"]}]},{"name":"Funda\u00e7\u00e3o Para a Ci\u00eancia e Tecnologia","award":["UIDP\/00617\/2020"],"award-info":[{"award-number":["UIDP\/00617\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Physiologia"],"abstract":"<jats:p>Background: Extensive data exists on external load during training and competition, but a significant gap remains in understanding internal physiological load, particularly in protocols conducted in ecological settings. Given the scarcity of studies on the on-field cardiorespiratory profiles of national-level athletes, especially in Argentine soccer, this study aimed to identify the on-field cardiorespiratory fitness profile of ten highly trained youth field soccer players (13.6 \u00b1 1.3 years old) from both the first league of the Argentine Football Association and members of the national team in their age group category in the current year. Methods: Each athlete performed an on-field cardiorespiratory exercise test (20-m Shuttle Run Test, 20-m SRT) with the COSMED K5 wearable metabolic system (COSMED, Rome, Italy) in dynamic micro-mixing chamber mode. The 20-m Shuttle Run Test involves running back and forth between two lines set 20 m apart, following the pace set by an audio signal. The test starts at a running velocity of 8.5 km\u00b7h\u22121 and increases by 0.5 km\u00b7h\u22121 each min. Results: Mean velocity at maximal oxygen uptake (vV\u02d9O2max) was 12.3 \u00b1 0.7 km\u00b7h\u22121. The maximal oxygen uptake (V\u02d9O2max) on-field was 67.1 \u00b1 5.3 mL\u00b7kg\u22121\u00b7min\u22121. The V\u02d9O2 at the first and second ventilatory thresholds (VT1 and VT2) were identified at 67.0 \u00b1 3.0% V\u02d9O2max (44.9 \u00b1 3.3 mL\u00b7kg\u22121\u00b7min\u22121) and 84.7 \u00b1 3.7% V\u02d9O2max (56.8 \u00b1 3.8 mL\u00b7kg\u22121\u00b7min\u22121), respectively. Conclusions: This is a scarce on-field gas exchange assessment, conducted in an ecological context using a portable analyzer with highly trained national-level youth soccer players from the Argentine youth national team, which underlines their cardiorespiratory fitness, showcases their high-performance potential, offers valuable insights into a selective group of players, and provides a reference for larger-scale research on elite youth soccer and the long-term development of aerobic power and capacity.<\/jats:p>","DOI":"10.3390\/physiologia5020014","type":"journal-article","created":{"date-parts":[[2025,4,10]],"date-time":"2025-04-10T07:41:51Z","timestamp":1744270911000},"page":"14","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Aerobic Power and Capacity in Highly Trained National-Level Youth Soccer Players Through On-Field Gas Exchange Assessment in an Ecological Context: A Brief Report"],"prefix":"10.3390","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3169-3386","authenticated-orcid":false,"given":"Martin Fernando","family":"Bruzzese","sequence":"first","affiliation":[{"name":"Club Atl\u00e9tico San Lorenzo de Almagro, Av. Perito Moreno 2145, Aut\u00f3noma de Buenos Aires C1437 Cdad., Argentina"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7753-4276","authenticated-orcid":false,"given":"Gast\u00f3n C\u00e9sar","family":"Garc\u00eda","sequence":"additional","affiliation":[{"name":"Instituto Universitario de Educaci\u00f3n F\u00edsica Jorge Coll 9016, San Rafael 5600, Mendoza, Argentina"}]},{"given":"Carlos Rodolfo","family":"Arcuri","sequence":"additional","affiliation":[{"name":"Universidad Nacional de Catamarca, San Fernando del Valle de Catamarca, Catamarca C.P. 4700, Argentina"}]},{"given":"Mauro Dar\u00edo","family":"Santander","sequence":"additional","affiliation":[{"name":"Observatorio de Deporte, Actividad F\u00edsica y Cultura (UPEPS), Ministerio de Desarrollo Humano, Neuqu\u00e9n CP 8300, Argentina"}]},{"given":"Jerem\u00edas David","family":"Secchi","sequence":"additional","affiliation":[{"name":"Universidad Adventista del Plata, Libertador San Martin C.P. 3101, Entre R\u00edos, Argentina"}]},{"given":"Jos\u00e9 Augusto Rodrigues","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Centre of Research, Education, Innovation and Intervention in Sport (CIFI<sub>2<\/sub>D), Faculty of Sport, University of Porto (FADEUP), 4200-450 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0494-0000","authenticated-orcid":false,"given":"Rodrigo","family":"Zacca","sequence":"additional","affiliation":[{"name":"Research Center in Physical Activity, Health and Leisure (CIAFEL), Faculty of Sports, University of Porto (FADEUP), 4200-450 Porto, Portugal"},{"name":"Laboratory for Integrative and Translational Research in Population Health (ITR), 4050-600 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,10]]},"reference":[{"key":"ref_1","first-page":"467","article-title":"Cardiopulmonary exercise test: Background, applicability and interpretation","volume":"107","author":"Herdy","year":"2016","journal-title":"Arq. 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