{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T00:47:06Z","timestamp":1776818826045,"version":"3.51.2"},"reference-count":0,"publisher":"JURUFRA SL","license":[{"start":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T00:00:00Z","timestamp":1776643200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Retos"],"abstract":"<jats:p>Introduction: Strength training (ST) influences metabolic demand and training efficiency. Oxygen consumption (VO2) represents a central physiological marker linking exercise structure to energy expenditure, yet the effects of simultaneously engaging upper and lower body musculature remain underexplored.\nObjective: To compare the acute physiological responses to simultaneous versus isolated execution of ST exercises, focusing on VO2.\nMethodology: Ten recreationally trained men (25.0\u00b13.97 years) participated in a randomized crossover design. Participants performed two protocols: simultaneous execution (SS) of incline dumbbell press and 45\u00ba leg press, and isolated execution (SI) of the same exercises in separate sets, both at 70% of one-repetition maximum. VO2 (absolute and relative), heart rate (HR), and respiratory exchange ratio (RER) were continuously measure. Linear mixed-effects models were applied to compared conditions.\nResults: SS elicited significantly higher VO2 than SI (VO2A: 1.58\u00b10.06 l.min-1 vs 1.23\u00b10.06 l.min-1; VO2R: 20.91\u00b10.42 ml.kg-1.min-1 vs 16.38\u00b10.55 ml.kg-1.min-1; p&lt;0.001), with very large effect sizes. HR. was also higher in SS (p&lt;0.001), whereas RER was significantly higher in SI (p&lt;0.001).\nDiscussion: The elevated VO\u2082 during SS likely reflects accelerated VO\u2082 on kinetics driven by greater concurrent muscle mass activation and reduced metabolic recovery periods, increasing systemic ATP turnover and cardiorespiratory demand. These findings highlight exercise configuration as a key modulator of physiological load beyond traditional variables such as intensity and volume.\nConclusions: Simultaneous upper and lower body ST execution enhances VO2 per unit of time and represents a time-efficient strategy to increase metabolic stress, with practical implications for optimizing ST prescription in health and performance settings.<\/jats:p>","DOI":"10.47197\/retos.v80.118687","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T00:00:35Z","timestamp":1776816035000},"page":"185-192","source":"Crossref","is-referenced-by-count":0,"title":["Comparing the effects of simultaneous execution versus isolated training on oxygen consumption during exercise","Comparaci\u00f3n de los efectos de la ejecuci\u00f3n simult\u00e1nea versus el entrenamiento aislado sobre el consumo de ox\u00edgeno durante el ejercicio","Compara\u00e7\u00e3o dos efeitos da execu\u00e7\u00e3o simult\u00e2nea versus treino isolado no consumo de oxig\u00e9nio durante o exerc\u00edcio"],"prefix":"10.47197","volume":"80","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5399-7797","authenticated-orcid":false,"given":"Jos\u00e9","family":"Vila\u00e7a Alves","sequence":"first","affiliation":[]},{"given":"Catia","family":"Silva","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1866-553X","authenticated-orcid":false,"given":"Estev\u00e3o","family":"Rios Monteiro","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1594-4429","authenticated-orcid":false,"given":"Jeferson","family":"Vianna","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9304-6574","authenticated-orcid":false,"given":"Jefferson","family":"Novaes","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8105-7580","authenticated-orcid":false,"given":"Nuno","family":"Garrido","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4996-1414","authenticated-orcid":false,"given":"Victor","family":"Reis","sequence":"additional","affiliation":[]}],"member":"26775","published-online":{"date-parts":[[2026,4,20]]},"container-title":["Retos"],"original-title":[],"link":[{"URL":"https:\/\/revistaretos.org\/index.php\/retos\/article\/download\/118687\/84981","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/revistaretos.org\/index.php\/retos\/article\/download\/118687\/84981","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T00:00:36Z","timestamp":1776816036000},"score":1,"resource":{"primary":{"URL":"https:\/\/revistaretos.org\/index.php\/retos\/article\/view\/118687"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,4,20]]},"references-count":0,"URL":"https:\/\/doi.org\/10.47197\/retos.v80.118687","relation":{},"ISSN":["1988-2041","1579-1726"],"issn-type":[{"value":"1988-2041","type":"electronic"},{"value":"1579-1726","type":"print"}],"subject":[],"published":{"date-parts":[[2026,4,20]]}}}