{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T20:49:57Z","timestamp":1761598197109,"version":"build-2065373602"},"reference-count":30,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,4,24]],"date-time":"2020-04-24T00:00:00Z","timestamp":1587686400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>The aim of this study was to analyse the effect of four types of re-warm-up (R-WU) activity, namely rest in normoxia (RN) at FiO2 = 20.9%, rest in hypoxia (RH) at FiO2 = 15%, activity (4 \u00d7 5 jumps\/15 s) in normoxia (AN) and activity in hypoxia (AH) on physical performance. Ten elite male rugby players completed a 15-min warm-up followed by one of the 15-min randomized R-WU strategies. After R-WU, countermovement jump (CMJ), 20 m sprint and repeat sprint ability (RSA) tests were assessed. Compared to passive strategies (RN and RH), tympanic temperature was higher after active R-WU (AN and AH) (p = 0.016). Higher values of CMJ height (p = 0.037) and 20 m sprint (p = 0.02) were found in AH than in RN. In addition, mean RSA was lower (p = 0.008) in AH than in RN and RH. Blood lactate concentration was higher (p = 0.007) after RN and AN strategies than after AH. Muscle O2 saturation (p = 0.021) and total Hb (p = 0.042) were higher after AH than after the other three conditions and after RN, respectively. Therefore, an active R-WU under hypoxia could be useful to elite rugby players, once it had attenuated the decline in tympanic temperature during a 15-min period after warm-up, improving jump, sprint and RSA performance.<\/jats:p>","DOI":"10.3390\/ijerph17082971","type":"journal-article","created":{"date-parts":[[2020,4,24]],"date-time":"2020-04-24T11:42:14Z","timestamp":1587728534000},"page":"2971","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Impact of Active and Passive Hypoxia as Re-Warm-Up Activities on Rugby Players\u2019 Performance"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8890-4244","authenticated-orcid":false,"given":"Domingo Jes\u00fas","family":"Ramos-Campo","sequence":"first","affiliation":[{"name":"Faculty of Sports, UCAM, Catholic University San Antonio, 30107 Murcia, Spain"}]},{"given":"Jo\u00e3o","family":"Malta","sequence":"additional","affiliation":[{"name":"Departamento de Desporto e Sa\u00fade, Escola de Ci\u00eancias e Tecnologia, Universidade de \u00c9vora, 7000-645 \u00c9vora, Portugal"},{"name":"Comprehensive Health Research Centre (CHRC), University of \u00c9vora, 7000-645 \u00c9vora, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8256-0882","authenticated-orcid":false,"given":"Guillermo","family":"Olcina","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, University of Extremadura, 10003 C\u00e1ceres, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2187-0465","authenticated-orcid":false,"given":"Rafael","family":"Tim\u00f3n","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, University of Extremadura, 10003 C\u00e1ceres, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9753-8381","authenticated-orcid":false,"given":"Armando","family":"Raimundo","sequence":"additional","affiliation":[{"name":"Departamento de Desporto e Sa\u00fade, Escola de Ci\u00eancias e Tecnologia, Universidade de \u00c9vora, 7000-645 \u00c9vora, Portugal"},{"name":"Comprehensive Health Research Centre (CHRC), University of \u00c9vora, 7000-645 \u00c9vora, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7780-3942","authenticated-orcid":false,"given":"Pablo","family":"Tomas-Carus","sequence":"additional","affiliation":[{"name":"Departamento de Desporto e Sa\u00fade, Escola de Ci\u00eancias e Tecnologia, Universidade de \u00c9vora, 7000-645 \u00c9vora, Portugal"},{"name":"Comprehensive Health Research Centre (CHRC), University of \u00c9vora, 7000-645 \u00c9vora, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2285","DOI":"10.1007\/s40279-018-0958-5","article-title":"Effects of Warm-Up, Post-Warm-Up, and Re-Warm-Up Strategies on Explosive Efforts in Team Sports: A Systematic Review","volume":"48","author":"Silva","year":"2018","journal-title":"Sport. 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