{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T20:08:58Z","timestamp":1774296538831,"version":"3.50.1"},"reference-count":35,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T00:00:00Z","timestamp":1763510400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Funds through the FCT Portuguese Foundation for Science and Technology"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JFMK"],"abstract":"<jats:p>Background: Combining body composition, dynamic postural control, and isokinetic strength allows for a comprehensive physical and functional assessment of football players across specific playing positions. The aim of this study was to analyze the field position-related variations in the physical and functional profiles of male football players. Methods: A convenience sample of 23 professional male football players from a Portuguese second league team, aged 18 to 32 years (23.83 \u00b1 3.77 years), participated in the present study. Players from five field positions (central backs, central midfielders, wide midfielders, and forwards) were assessed for body composition, dynamic postural control, and isokinetic lower limb strength. Body composition was assessed by bioelectrical impedance; composite scores for postural control in the right and left limbs were obtained through the Y-Balance test lower quarter (YBT-LQ). Peak torque (PT) during lower limb flexion and extension was measured using an isokinetic dynamometer chair. Results: Significant differences were found only in peak torque of the right extensors [H (4) = 9.84, p = 0.043, \u03b72 = 0.37)], whereas no significant differences emerged in body mass, dynamic balance scores, left-side extension and flexion, or hamstring-to-quadriceps (H:Q) strength ratios. Post hoc analysis using Mann\u2013Whitney U tests with Holm correction did not confirm pairwise differences between positions. The correlation analysis revealed mainly moderate-to-strong associations between symmetrical measures (composite YBT-LQ right and left, PT extension right and left), as well as between anthropometric and strength variables, but without consistent position-specific patterns. Conclusions: Overall, the study provides valuable insights into the physical attributes of professional football players, highlighting the general similarity of profiles across positions and suggesting that individualized training approaches may still be beneficial to optimizing performance and reduce injury risk. Future studies should extend the analysis to larger cohorts across different professional Portuguese football teams and competitions.<\/jats:p>","DOI":"10.3390\/jfmk10040447","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T08:50:07Z","timestamp":1763542207000},"page":"447","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Field Position-Related Variations in Body Mass, Postural Control, and Isokinetic Strength in Portuguese Professional Football"],"prefix":"10.3390","volume":"10","author":[{"given":"Jo\u00e3o","family":"Rocha","sequence":"first","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"}]},{"given":"H\u00e9lder","family":"Cruz","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4612-3623","authenticated-orcid":false,"given":"Jos\u00e9 Eduardo","family":"Teixeira","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"},{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"},{"name":"Department of Sports Sciences, Polytechnic of C\u00e1vado and Ave, 4806-909 Guimar\u00e3es, Portugal"},{"name":"Research Centre for Active Living and Wellbeing (LiveWell), Instituto Polit\u00e9cnico de Bragan\u00e7a, 5300-253 Bragan\u00e7a, Portugal"}]},{"given":"Carolina","family":"Vila-Ch\u00e3","sequence":"additional","affiliation":[{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"},{"name":"Department of Sports Sciences, Polytechnic of C\u00e1vado and Ave, 4806-909 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8557-5257","authenticated-orcid":false,"given":"Ra\u00fal Filipe","family":"Bartolomeu","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"},{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"},{"name":"Research Centre for Active Living and Wellbeing (LiveWell), Instituto Polit\u00e9cnico de Bragan\u00e7a, 5300-253 Bragan\u00e7a, Portugal"},{"name":"Department of Sport Sciences, Instituto Polit\u00e9cnico de Bragan\u00e7a, 5300-253 Bragan\u00e7a, Portugal"}]},{"given":"Jo\u00e3o Nuno","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"},{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"},{"name":"Department of Sport Sciences, University of Beira Interior, 6201-001 Covilh\u00e3, Portugal"},{"name":"Research Centre in Sport Sciences, Health Sciences and Human Development, CIDESD, Creative Lab Research Community, 5000-801 Vila Real, Portugal"},{"name":"Portugal Football School, Portuguese Football Federation, 1495-433 Oeiras, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9898-847X","authenticated-orcid":false,"given":"Faber","family":"Martins","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"},{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4675-2959","authenticated-orcid":false,"given":"Pedro Tiago","family":"Esteves","sequence":"additional","affiliation":[{"name":"Department of Sports and Expressions, Polytechnic of Guarda, 6300-559 Guarda, Portugal"},{"name":"Sport Physical Activity and Health & Innovation Center (SPRINT), 2040-413 Rio Maior, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"799","DOI":"10.1007\/s40279-017-0836-6","article-title":"What Performance Analysts Need to Know about Research Trends in Association Football (2012\u20132016): A Systematic Review","volume":"48","author":"Sarmento","year":"2018","journal-title":"Sports Med."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Gon\u00e7alves, B., Coutinho, D., Exel, J., Travassos, B., Lago, C., and Sampaio, J. (2019). Extracting Spatial-Temporal Features That Describe a Team Match Demands When Considering the Effects of the Quality of Opposition in Elite Football. PLoS ONE, 14.","DOI":"10.1371\/journal.pone.0221368"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Costa, J.A., Rago, V., Brito, P., Figueiredo, P., Sousa, A., Abade, E., and Brito, J. (2022). Training in Women Soccer Players: A Systematic Review on Training Load Monitoring. Front. Psychol., 13.","DOI":"10.3389\/fpsyg.2022.943857"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1007\/s00421-024-05672-3","article-title":"Anthropometric-Based Predictive Equations Developed with Multi-Component Models for Estimating Body Composition in Athletes","volume":"125","author":"Serafini","year":"2024","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Clemente, F.M., Ramirez-Campillo, R., Afonso, J., and Sarmento, H. (2021). Effects of Small-Sided Games vs. Running-Based High-Intensity Interval Training on Physical Performance in Soccer Players: A Meta-Analytical Comparison. Front. Physiol., 12.","DOI":"10.3389\/fphys.2021.642703"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Sebasti\u00e1-Rico, J., Mart\u00ednez-Sanz, J.M., Gonz\u00e1lez-G\u00e1lvez, N., and Soriano, J.M. (2023). Differences in Body Composition between Playing Positions in Men\u2019s Professional Soccer: A Systematic Review with Meta-Analysis. Appl. Sci., 13.","DOI":"10.3390\/app13084782"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1190","DOI":"10.26603\/001c.27634","article-title":"Systematic Review and Meta-Analysis of the Y-Balance Test Lower Quarter: Reliability, Discriminant Validity, and Predictive Validity","volume":"16","author":"Plisky","year":"2021","journal-title":"Int. J. Sports Phys. Ther."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"616","DOI":"10.4085\/1062-6050-47.5.14","article-title":"Differences in soccer players\u2019 dynamic balance across levels of competition","volume":"47","author":"Butler","year":"2012","journal-title":"J. Athl. Train."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Tekin, E., Egesoy, H., and Unver, F. (2024). The Effect of Competition Sounds on Balance Performance in Football Players. Phys. Med. Rehabil. Kurortmed.","DOI":"10.1055\/a-2420-1196"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1249\/MSS.0000000000000380","article-title":"Association of y Balance Test Reach Asymmetry and Injury in Division I Athletes","volume":"47","author":"Smith","year":"2015","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"654","DOI":"10.1123\/jsr.2024-0081","article-title":"Role of Thigh Muscle Strength and Joint Kinematics in Dynamic Stability: Implications for Y-Balance Test Performance","volume":"33","author":"Turner","year":"2024","journal-title":"J. Sport Rehabil."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1080\/24733938.2017.1371851","article-title":"Contemporary Approaches to Isokinetic Strength Assessments in Professional Football Players","volume":"1","author":"Eustace","year":"2017","journal-title":"Sci. Med. Footb."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1364","DOI":"10.1136\/bjsports-2013-093016","article-title":"At Return to Play Following Hamstring Injury the Majority of Professional Football Players Have Residual Isokinetic Deficits","volume":"48","author":"Tol","year":"2014","journal-title":"Br. J. Sports Med."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3233\/IES-2011-0406","article-title":"Hamstring to Quadriceps Strength Ratio and Noncontact Leg Injuries: A Prospective Study during One Season","volume":"19","author":"Kim","year":"2011","journal-title":"Isokinet. Exerc. Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1789","DOI":"10.1177\/0363546516632526","article-title":"Hamstring and Quadriceps Isokinetic Strength Deficits Are Weak Risk Factors for Hamstring Strain Injuries: A 4-Year Cohort Study","volume":"44","author":"Bahr","year":"2016","journal-title":"Am. J. Sports Med."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2663","DOI":"10.1177\/0363546515599633","article-title":"Eccentric Knee Flexor Strength and Risk of Hamstring Injuries in Rugby Union: A Prospective Study","volume":"43","author":"Bourne","year":"2015","journal-title":"Am. J. Sports Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"148","DOI":"10.1016\/j.gaitpost.2019.09.008","article-title":"Analysis of Static Balance Performance and Dynamic Postural Priority According to Playing Position in Elite Soccer Players","volume":"74","author":"Jadczak","year":"2019","journal-title":"Gait Posture"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"106","DOI":"10.31254\/sportmed.2202","article-title":"Differences in Anthropometric Measures and Performance Profiles between Cypriot and Foreign Players Participating in First Division in Cyprus","volume":"2","author":"Parpa","year":"2018","journal-title":"Int. J. Sport Exerc. Health Res."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Gonz\u00e1lez-Fern\u00e1ndez, F.T., Mart\u00ednez-Aranda, L.M., Falces-Prieto, M., Nobari, H., and Clemente, F.M. (2022). Exploring the Y-Balance-Test Scores and Inter-Limb Asymmetry in Soccer Players: Differences between Competitive Level and Field Positions. BMC Sports Sci. Med. Rehabil., 14.","DOI":"10.1186\/s13102-022-00438-w"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Burns, M.K., Patel, V., Florescu, I., Pochiraju, K.V., and Vinjamuri, R. (2017). Low-Dimensional Synergistic Representation of Bilateral Reaching Movements. Front. Bioeng. Biotechnol., 5.","DOI":"10.3389\/fbioe.2017.00002"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"van Tittelboom, V., Alemdaroglu-G\u00fcrb\u00fcz, I., Hanssen, B., Heyrman, L., Feys, H., Desloovere, K., Calders, P., and Van den Broeck, C. (2022). Reliability of Isokinetic Strength Assessments of Knee and Hip Using the Biodex System 4 Dynamometer and Associations With Functional Strength in Healthy Children. Front. Sports Act. Living, 4.","DOI":"10.3389\/fspor.2022.817216"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1469","DOI":"10.1177\/0363546508316764","article-title":"Strength Imbalances and Prevention of Hamstring Injury in Professional Soccer Players: A Prospective Study","volume":"36","author":"Croisier","year":"2008","journal-title":"Am. J. Sports Med."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"249","DOI":"10.1080\/24748668.2023.2221501","article-title":"Changes in Knee Flexion-Extension Performance and Hamstring-to-Quadriceps Ratio during a Fatiguing Isokinetic Protocol in Male Professional Futsal Players","volume":"23","author":"Machado","year":"2023","journal-title":"Int. J. Perform. Anal. Sport"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1169","DOI":"10.1007\/s11332-023-01046-y","article-title":"Relationship between Maximal Strength and Hamstring-to-Quadriceps Ratios in Balanced and Unbalanced Legs in Futsal Athletes","volume":"19","author":"Fortes","year":"2023","journal-title":"Sport Sci. Health"},{"key":"ref_25","first-page":"896","article-title":"Examination of the Isokinetic Knee Strength and Balance Performance of Professional Football Players by Position","volume":"6","author":"Atasever","year":"2023","journal-title":"Mediterr. J. Sport Sci."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1463","DOI":"10.1080\/02640410903131681","article-title":"The Influence of Match Location, Quality of Opposition, and Match Status on Possession Strategies in Professional Association Football","volume":"27","author":"Lago","year":"2009","journal-title":"J. Sports Sci."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3358","DOI":"10.1519\/JSC.0b013e318216305d","article-title":"Anthropometric and Physiological Characteristics of Young Soccer Players According to Their Playing Positions: Relevance for Competition Success","volume":"25","author":"Casais","year":"2011","journal-title":"J. Strength Cond. Res."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"678","DOI":"10.1080\/24748668.2013.11868680","article-title":"Measuring Collective Behaviour in Football Teams: Inspecting the Impact of Each Half of the Match on Ball Possession","volume":"13","author":"Clemente","year":"2013","journal-title":"Int. J. Perform. Anal. Sport"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"2841","DOI":"10.1007\/s40279-024-02088-z","article-title":"The Influence of Playing Position on Physical, Physiological, and Technical Demands in Adult Male Soccer Matches: A Systematic Scoping Review with Evidence Gap Map","volume":"54","author":"Sarmento","year":"2024","journal-title":"Sports Med."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"CPG1","DOI":"10.2519\/jospt.2022.0301","article-title":"Hamstring Strain Injury in Athletes","volume":"52","author":"Martin","year":"2022","journal-title":"J. Orthop. Sports Phys. Ther."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"15609","DOI":"10.7717\/peerj.15609","article-title":"Clustering U-14 Portuguese Regional Team Football Players by Lower Limb Strength, Power, Dynamic Balance, Speed and Change of Direction: Understanding the Field Position Factor","volume":"11","author":"Sampaio","year":"2023","journal-title":"PeerJ"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1220","DOI":"10.1519\/JSC.0000000000000766","article-title":"Lower-Extremity Strength Ratios of Professional Soccer Players According to Field Position","volume":"29","author":"Ruas","year":"2015","journal-title":"J. Strength Cond. Res."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1791","DOI":"10.1519\/JSC.0b013e3182772da6","article-title":"Different Loading Schemes in Power Training During the Preseason Promote Similar Performance Improvements in Brazilian Elite Soccer Players","volume":"27","author":"Loturco","year":"2013","journal-title":"J. Strength Cond. Res."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Paillard, T. (2019). Relationship Between Sport Expertise and Postural Skills. Front. Psychol., 10.","DOI":"10.3389\/fpsyg.2019.01428"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"313","DOI":"10.1519\/JSC.0000000000002342","article-title":"Running Performance in Brazilian Professional Football Players during a Congested Match Schedule","volume":"32","author":"Vieira","year":"2018","journal-title":"J. Strength Cond. 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