{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T00:05:45Z","timestamp":1776211545936,"version":"3.50.1"},"reference-count":41,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,7,31]],"date-time":"2021-07-31T00:00:00Z","timestamp":1627689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UIDP\/04748\/2020"],"award-info":[{"award-number":["UIDP\/04748\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Healthcare"],"abstract":"<jats:p>Background: The main purpose of the current study was to compare the within-season variations of workload, training duration, acute\/chronic workload ratio (ACWR), training monotony \u2122, and training strain (TS) through session rating perceived exertion (s-RPE) between starters and non-starters. Methods: Seventeen under-17 European male soccer players (age, 16.2 \u00b1 0.3 y, height, 1.8 \u00b1 0.1 m; body mass, 66.5 \u00b1 4.0 kg) divided in two groups: nine starters and eight non-starters, were evaluated over 50 weeks throughout the season. Results: In general, there were load variations for all players during the full-season. RPE tended to decrease during in-season and RPE, training duration and s-RPE did not present significant differences between starters and non-starters. TM and TS presented lower values for starters in mesocycle (M) 4 and M11 compared to non-starters. TS presented lower values for starters in M4 and M11 compared to non-starters, while in M10 a higher value was found for starters when compared to non-starters. ACWR showed differences between starters and non-starters in two of the mesocycles. Conclusions: This study showed that some mesocycles provided higher load for non-starters. This information can alert coaches that non-starter players are likely to try too hard in training to demonstrate their abilities, leading to non-functional overreaching, overtraining syndrome, and then poor performance.<\/jats:p>","DOI":"10.3390\/healthcare9080977","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T21:51:07Z","timestamp":1627854667000},"page":"977","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Intra-Season Variations in Workload Parameters in Europe\u2019s Elite Young Soccer Players: A Comparative Pilot Study between Starters and Non-Starters"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1524-5601","authenticated-orcid":false,"given":"Alexandre D.","family":"Martins","sequence":"first","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"Life Quality Research Centre, 2140-413 Rio Maior, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6671-6229","authenticated-orcid":false,"given":"Rafael","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"Life Quality Research Centre, 2140-413 Rio Maior, Portugal"},{"name":"Research Center in Sport Sciences, Health Sciences and Human Development, Quinta de Prados, Edif\u00edcio Ci\u00eancias de Desporto, 5001-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4357-4269","authenticated-orcid":false,"given":"Jo\u00e3o P.","family":"Brito","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"Life Quality Research Centre, 2140-413 Rio Maior, Portugal"},{"name":"Research Center in Sport Sciences, Health Sciences and Human Development, Quinta de Prados, Edif\u00edcio Ci\u00eancias de Desporto, 5001-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6558-1956","authenticated-orcid":false,"given":"Nuno","family":"Loureiro","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"Life Quality Research Centre, 2140-413 Rio Maior, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1750-5019","authenticated-orcid":false,"given":"S\u00e9rgio M.","family":"Querido","sequence":"additional","affiliation":[{"name":"Faculty of Human Kinetics, University of Lisbon, 1649-004 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7951-8977","authenticated-orcid":false,"given":"Hadi","family":"Nobari","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Sports, University of Granada, 18010 Granada, Spain"},{"name":"HEME Research Group, Faculty of Sport Sciences, University of Extremadura, 10003 C\u00e1ceres, Spain"},{"name":"Sports Scientist, Sepahan Football Club, Isfahan 81887-78473, Iran"},{"name":"Department of Exercise Physiology, Faculty of Sport Sciences, University of Isfahan, Isfahan 81746-7344, Iran"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"943","DOI":"10.1007\/s40279-016-0619-5","article-title":"Training Load and Fatigue Marker Associations with Injury and Illness: A Systematic Review of Longitudinal Studies","volume":"47","author":"Jones","year":"2016","journal-title":"Sports Med."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"270","DOI":"10.1123\/ijspp.2018-0935","article-title":"Internal and External Training Load: 15 Years On","volume":"14","author":"Impellizzeri","year":"2019","journal-title":"Int. J. Sports Physiol. Perform."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1080\/02640410400021278","article-title":"Physiological assessment of aerobic training in soccer","volume":"23","author":"Impellizzeri","year":"2005","journal-title":"J. Sports Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2135","DOI":"10.1007\/s40279-017-0714-2","article-title":"Training Load Monitoring in Team Sports: A Novel Framework Separating Physiological and Biomechanical Load-Adaptation Pathways","volume":"47","author":"Vanrenterghem","year":"2017","journal-title":"Sports Med."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1519\/SSC.0000000000000234","article-title":"Integrative Neuromuscular Training in Youth Athletes. Part II: Strategies to Prevent Injuries and Improve Performance","volume":"38","author":"Lloyd","year":"2016","journal-title":"Strength Cond. J."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"608","DOI":"10.3389\/fphys.2020.00608","article-title":"Association Between the Acute to Chronic Workload Ratio and Injury Occurrence in Young Male Team Soccer Players: A Preliminary Study","volume":"11","author":"Arazi","year":"2020","journal-title":"Front. Physiol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1365","DOI":"10.1123\/ijspp.2017-0843","article-title":"Dose\u2013Response Relationship Between Training Load and Changes in Aerobic Fitness in Professional Youth Soccer Players","volume":"13","author":"Fitzpatrick","year":"2018","journal-title":"Int. J. Sports Physiol. Perform."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"612","DOI":"10.3389\/fnins.2017.00612","article-title":"Session-RPE Method for Training Load Monitoring: Validity, Ecological Usefulness, and Influencing Factors","volume":"11","author":"Haddad","year":"2017","journal-title":"Front. Neurosci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1573","DOI":"10.1080\/02640414.2012.709265","article-title":"Quantification of the typical weekly in-season training load in elite junior soccer players","volume":"30","author":"Wrigley","year":"2012","journal-title":"J. Sports Sci."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Clemente, F.M., Silva, R., Castillo, D., Arcos, A.L., Mendes, B., and Afonso, J. (2020). Weekly Load Variations of Distance-Based Variables in Professional Soccer Players: A Full-Season Study. Int. J. Environ. Res. Public Health, 17.","DOI":"10.3390\/ijerph17093300"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"113117","DOI":"10.1016\/j.physbeh.2020.113117","article-title":"Description of acute and chronic load, training monotony and strain over a season and its relationships with well-being status: A study in elite under-16 soccer players","volume":"225","author":"Nobari","year":"2020","journal-title":"Physiol. Behav."},{"key":"ref_12","first-page":"105","article-title":"Comparisons of new body load and metabolic power average workload indices between starters and non-starters: A full-season study in professional soccer players","volume":"235","author":"Nobari","year":"2020","journal-title":"Proc. Inst. Mech. Eng. Part P J. Sports Eng. Technol."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Impellizzeri, F.M., Wookcock, S., Coutts, A.J., Fanchini, M., McCall, A., and Vigotsky, A.D. (2020). Acute to Random Workload Ratio Is \u2018as\u2019 Associated with Injury as Acute to Actual Chronic Workload Ratio: Time to Dismiss ACWR and Its Components. SportRxiv.","DOI":"10.31236\/osf.io\/e8kt4"},{"key":"ref_14","first-page":"108","article-title":"Does load management using the acute:chronic workload ratio prevent health problems? A cluster randomised trial of 482 elite youth footballers of both sexes","volume":"55","author":"Clarsen","year":"2020","journal-title":"Br. J. Sports Med."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1196","DOI":"10.1249\/MSS.0000000000002215","article-title":"The Acute:Chronic Workload Ratio Is Associated with Injury in Junior Tennis Players","volume":"52","author":"Myers","year":"2019","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1164","DOI":"10.1097\/00005768-199807000-00023","article-title":"Monitoring training in athletes with reference to overtraining syndrome","volume":"30","author":"Foster","year":"1998","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1136\/bjsports-2015-094817","article-title":"The acute:chronic workload ratio predicts injury: High chronic workload may decrease injury risk in elite rugby league players","volume":"50","author":"Hulin","year":"2015","journal-title":"Br. J. Sports Med."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1055\/a-0997-6741","article-title":"Workload and Injury in Professional Soccer Players: Role of Injury Tissue Type and Injury Severity","volume":"41","author":"Enright","year":"2020","journal-title":"Int. J. Sports Med."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"561","DOI":"10.1007\/s40279-019-01218-2","article-title":"The Association Between the Acute:Chronic Workload Ratio and Injury and its Application in Team Sports: A Systematic Review","volume":"50","author":"Griffin","year":"2019","journal-title":"Sports Med."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"146","DOI":"10.1016\/j.physbeh.2018.11.036","article-title":"In-season training load quantification of one-, two- and three-game week schedules in a top European professional soccer team","volume":"201","author":"Oliveira","year":"2019","journal-title":"Physiol. Behav."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Dalen, T., and Lor\u00e5s, H. (2019). Monitoring Training and Match Physical Load in Junior Soccer Players: Starters versus Substitutes. Sports, 7.","DOI":"10.3390\/sports7030070"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Nobari, H., Oliveira, R., Clemente, F.M., Adsuar, J.C., P\u00e9rez-G\u00f3mez, J., Carlos-Vivas, J., and Brito, J.P. (2020). Comparisons of Accelerometer Variables Training Monotony and Strain of Starters and Non-Starters: A Full-Season Study in Professional Soccer Players. Int. J. Environ. Res. Public Health, 17.","DOI":"10.3390\/ijerph17186547"},{"key":"ref_23","first-page":"S1169","article-title":"International Seminar of Physical Education, Leisure and Health, 17\u201319 June 2019. Castelo Branco, Portugal","volume":"14","author":"Oliveira","year":"2019","journal-title":"J. Hum. Sport Exerc."},{"key":"ref_24","unstructured":"Castillo Alvira, D., and Raya-Gonz\u00e1lez, J. (2020). An Essential Guide to Sports Performance. Sports and Athletics Preparation, Performance, and Psychology, Nova Science Publishers."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"World Medical Association (2013). World Medical Association Declaration of Helsinki: Ethical Principles for Medical Research Involving Human Subjects. JAMA, 310, 2191\u20132194.","DOI":"10.1001\/jama.2013.281053"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Oliveira, R., Brito, J., Martins, A., Mendes, B., Marinho, D.A., Ferraz, R., and Marques, M.C. (2019). In-season internal and external training load quantification of an elite European soccer team. PLoS ONE, 14.","DOI":"10.1371\/journal.pone.0209393"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1033","DOI":"10.1260\/1747-9541.9.5.1033","article-title":"Technical and Physical Performance over an English Championship League Season","volume":"9","author":"Morgans","year":"2014","journal-title":"Int. J. Sports Sci. Coach."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Oliveira, R., Vieira, L.P., Martins, A., Brito, J., Nalha, M., Mendes, B., and Clemente, F. (2021). In-Season Internal and External Workload Variations between Starters and Non-Starters\u2014A Case Study of a Top Elite European Soccer Team. Medicine, 57.","DOI":"10.3390\/medicina57070645"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"92","DOI":"10.2340\/1650197719702239298","article-title":"Perceived exertion as an indicator of somatic stress","volume":"2","author":"Borg","year":"1970","journal-title":"Scand. J. Rehabil. Med."},{"key":"ref_30","first-page":"7","article-title":"A New Approach to Monitoring Exercise Training","volume":"1","author":"Foster","year":"2001","journal-title":"J. Strength Cond. Res."},{"key":"ref_31","first-page":"367","article-title":"Effects of specific versus cross-training on running performance","volume":"70","author":"Foster","year":"1995","journal-title":"Graefe\u2019s Arch. Clin. Exp. Ophthalmol."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1249\/MSS.0b013e31818cb278","article-title":"Progressive Statistics for Studies in Sports Medicine and Exercise Science","volume":"41","author":"Hopkins","year":"2009","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1399","DOI":"10.1519\/JSC.0b013e3181d7552a","article-title":"Profile of Weekly Training Load in Elite Male Professional Basketball Players","volume":"24","author":"Manzi","year":"2010","journal-title":"J. Strength Cond. Res."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"149","DOI":"10.5114\/biolsport.2017.64588","article-title":"In-season training periodization of professional soccer players","volume":"2","author":"Arcos","year":"2017","journal-title":"Biol. Sport"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1139\/h05-004","article-title":"Objective and subjective analysis of the training content in young cyclists","volume":"31","author":"Delattre","year":"2006","journal-title":"Appl. Physiol. Nutr. Metab."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1161","DOI":"10.1080\/02640414.2011.583671","article-title":"Quantification of the physiological loading of one week of \u201cpre-season\u201d and one week of \u201cin-season\u201d training in professional soccer players","volume":"29","author":"Jeong","year":"2011","journal-title":"J. Sports Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"597","DOI":"10.1519\/JSC.0b013e3181c4d38b","article-title":"Monitoring Load, Recovery, and Performance in Young Elite Soccer Players","volume":"24","author":"Brink","year":"2010","journal-title":"J. Strength Cond. Res."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1229","DOI":"10.1080\/02640414.2015.1022575","article-title":"Typical weekly workload of under 15, under 17, and under 19 elite Portuguese football players","volume":"33","author":"Coutinho","year":"2015","journal-title":"J. Sports Sci."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1186\/s40798-020-00296-1","article-title":"The Association Between Training Load and Injury Risk in Elite Youth Soccer Players: A Systematic Review and Best Evidence Synthesis","volume":"7","author":"Verstappen","year":"2021","journal-title":"Sports Med. Open"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"113118","DOI":"10.1016\/j.physbeh.2020.113118","article-title":"Does the distribution of the weekly training load account for the match results of elite professional soccer players?","volume":"225","author":"Oliveira","year":"2020","journal-title":"Physiol. Behav."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Oliveira, R., Brito, J., Loureiro, N., Padinha, V., Nobari, H., and Mendes, B. (2021). Will Next Match Location Influence External and Internal Training Load of a Top-Class Elite Professional European Soccer Team?. Int. J. Environ. Res. 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