{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T02:00:20Z","timestamp":1772848820369,"version":"3.50.1"},"reference-count":38,"publisher":"Human Kinetics","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,7,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Aim<\/jats:bold>:<\/jats:italic> To quantify the physiological demands and impact of muscle function <jats:italic>t<\/jats:italic> of the Fran workout, one of the most popular CrossFit benchmarks. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Twenty\u00a0experienced CrossFitters\u201416 male: 29 (6)\u00a0years old and 4 female: 26 (5)\u00a0years old\u2014 performed 3 rounds (with 30-s rests in between) of 21\u201321, 15\u201315, and 9\u20139 front squats to overhead press plus pull-up repetitions. Oxygen uptake and heart rate were measured at baseline, during the workout, and in the recovery period. Rating of perceived exertion, blood lactate, and glucose concentrations were assessed at rest, during the intervals, and in the recovery period. Muscular fatigue was also monitored at rest and at 5 minutes, 30 minutes, and 24 hours postexercise. Repeated-measures analysis of variance\u00a0was performed to compare time points. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Aerobic (52%\u201329%) and anaerobic alactic (30%\u201323%) energy contributions decreased and the anaerobic lactic contribution increased (18%\u201348%) across the 3 rounds of the Fran workout. Countermovement jump height decreased by 8% (\u221212 to \u22123) mean change (95% CI), flight duration by 14% (\u221219 to \u22127), maximum velocity by 3% (\u22125 to \u22120.1), peak force 4% (\u22127 to \u22120.1), and physical performance (plank prone 47% [\u221254 to \u221238]) were observed. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> It appears that the Fran workout is a physically demanding activity that recruits energy from both aerobic and anaerobic systems. This severe-intensity workout evokes substantial postexercise fatigue and corresponding reduction in muscle function.<\/jats:p>","DOI":"10.1123\/ijspp.2022-0411","type":"journal-article","created":{"date-parts":[[2023,5,24]],"date-time":"2023-05-24T15:55:45Z","timestamp":1684943745000},"page":"786-792","source":"Crossref","is-referenced-by-count":15,"title":["Bioenergetic Analysis and Fatigue Assessment During the Fran Workout in Experienced Crossfitters"],"prefix":"10.1123","volume":"18","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\/0000-0003-0494-0000","authenticated-orcid":true,"given":"Rodrigo","family":"Zacca","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\/0000-0002-8904-002X","authenticated-orcid":true,"given":"Rui","family":"Azevedo","sequence":"additional","affiliation":[{"name":"Toxicology Research Unit, University Institute of Health Sciences, CESPU CRL, Gandra, 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 & 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":"J Sports Sci Med","first-page":"670","article-title":"CrossFit\u00ae training strategies from the perspective of concurrent training: a systematic review","volume":"19","author":"Schlegel P","year":"2020","unstructured":"Schlegel P. 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