{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T01:43:28Z","timestamp":1772847808897,"version":"3.50.1"},"reference-count":44,"publisher":"Human Kinetics","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,3,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> Fran is one of the most popular CrossFit benchmark workouts used to control CrossFitters\u2019 improvements. Detailed physiological characterization of Fran is needed for a more specific evaluation of CrossFitters\u2019 training performance improvements. The aim of the study was to analyze the oxygen uptake (<jats:inline-formula\/>) kinetics and characterize the energy system contributions and the degree of postexercise fatigue of the unbroken Fran. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Twenty trained CrossFitters performed Fran at maximal exertion. <jats:inline-formula\/> and heart-rate kinetics were assessed at baseline\u00a0and during and post-Fran. Blood lactate and glucose concentrations and muscular fatigue were measured at baseline and in the recovery period. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> A marked increase in <jats:inline-formula\/> kinetics was observed at the beginning of Fran, remaining elevated until the end (<jats:inline-formula\/>: 49.2 [3.7]\u00a0mL\u00b7kg<jats:sup>\u22121<\/jats:sup>\u00b7min<jats:sup>\u22121<\/jats:sup>, <jats:inline-formula\/> amplitude: 35.8 [5.2]\u00a0mL\u00b7kg<jats:sup>\u22121<\/jats:sup>\u00b7min<jats:sup>\u22121<\/jats:sup>, time delay: 4.7 [2.5]\u00a0s and time constant: 23.7 [11.1]\u00a0s; mean [SD]). Aerobic, anaerobic lactic, and alactic pathways accounted for 62% (4%), 26% (4%), and 12% (2%) of energy contribution. Reduction in muscle function in jumping ability (jump height: 8% [6%], peak force: 6% [4%], and maximum velocity: 4% [2%]) and plank prone test (46% [20%]) was observed in the recovery period. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> The\u00a0Fran unbroken workout is a high-intensity effort associated with an elevated metabolic response. This pattern of energy response highlights the primary contribution of aerobic energy metabolism, even during short and very intense CrossFit workouts, and that recovery can take &gt;24\u00a0hours due to cumulative fatigue.<\/jats:p>","DOI":"10.1123\/ijspp.2023-0201","type":"journal-article","created":{"date-parts":[[2024,1,9]],"date-time":"2024-01-09T18:15:59Z","timestamp":1704824159000},"page":"299-306","source":"Crossref","is-referenced-by-count":21,"title":["Effect of the\u00a0Fran CrossFit Workout on Oxygen Uptake Kinetics, Energetics, and Postexercise Muscle Function in Trained CrossFitters"],"prefix":"10.1123","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3574-6692","authenticated-orcid":true,"given":"Manoel","family":"Rios","sequence":"first","affiliation":[{"name":"Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal"},{"name":"Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4814-9261","authenticated-orcid":true,"given":"Klaus Magno","family":"Becker","sequence":"additional","affiliation":[{"name":"Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal"},{"name":"Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3910-1194","authenticated-orcid":true,"given":"Ana Sofia","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal"},{"name":"Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4885-4924","authenticated-orcid":true,"given":"Pedro","family":"Fonseca","sequence":"additional","affiliation":[{"name":"Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1555-5079","authenticated-orcid":true,"given":"David B.","family":"Pyne","sequence":"additional","affiliation":[{"name":"Research Institute for Sport and Exercise, University of Canberra, Canberra, ACT, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4996-1414","authenticated-orcid":true,"given":"Victor Machado","family":"Reis","sequence":"additional","affiliation":[{"name":"Department of Sport Sciences, Exercise and Health, University of Tr\u00e1s-os-Montes e Alto Douro, Vila Real, Portugal"},{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7404-7405","authenticated-orcid":true,"given":"Daniel","family":"Moreira-Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Research Center in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Porto, Portugal"},{"name":"Laboratory for Integrative and Translational Research in Population Health, Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5811-0443","authenticated-orcid":true,"given":"Ricardo J.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal"},{"name":"Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal"}]}],"member":"100","reference":[{"issue":"4","key":"r1","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"524","DOI":"10.1123\/ijspp.4.4.524","article-title":"Oxygen uptake kinetics: an underappreciated determinant of exercise performance","volume":"4","author":"Jones AM","year":"2009","unstructured":"Jones AM, Burnley M. 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