{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T13:18:12Z","timestamp":1785417492925,"version":"3.56.0"},"reference-count":75,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T00:00:00Z","timestamp":1784160000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003359","name":"Generalitat Valenciana","doi-asserted-by":"publisher","award":["CIGE\/2023\/127"],"award-info":[{"award-number":["CIGE\/2023\/127"]}],"id":[{"id":"10.13039\/501100003359","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003359","name":"Generalitat Valenciana","doi-asserted-by":"publisher","award":["CIACIF\/2024\/507"],"award-info":[{"award-number":["CIACIF\/2024\/507"]}],"id":[{"id":"10.13039\/501100003359","id-type":"DOI","asserted-by":"publisher"}]},{"award":["CIGE\/2023\/127"],"award-info":[{"award-number":["CIGE\/2023\/127"]}],"id":[{"id":"https:\/\/ror.org\/0097mvx21","id-type":"ROR","asserted-by":"publisher"}]},{"award":["CIACIF\/2024\/507"],"award-info":[{"award-number":["CIACIF\/2024\/507"]}],"id":[{"id":"https:\/\/ror.org\/0097mvx21","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Understanding internal load in youth tennis is essential for optimizing training strategies and ensuring healthy development. This study analyzed the influence of ball type (green vs. standard) on heart rate (HR) responses in 19 players (10.17 \u00b1 1.1 years). Participants competed in 72 matches under a cross-over design while monitored with Wimu Pro\u2122 Electronic Performance and Tracking Systems and Garmin HR bands. Data were analyzed using a Bayesian repeated-measures ANOVA, incorporating biological maturation and physical activity levels as covariates. Results indicated anecdotal evidence in favor of the null model for Max HR and moderate evidence in favor of the null model for Avg HR. These findings suggest no clear evidence of a meaningful ball-type effect on acute cardiovascular responses under the short-format match-play conditions studied. Individual characteristics, particularly maturity-related indicators and habitual physical activity, appeared more informative than ball type, although their evidential support differed across heart-rate outcomes. Therefore, the acute physiological response appeared to be similar between ball conditions in this specific pilot setting, but these findings should be interpreted as preliminary rather than definitive. Overall, these findings highlight the value of sensor-based monitoring for contextualizing internal load in youth tennis and suggest that equipment transitions should be guided by individual developmental and activity-related characteristics rather than ball type alone.<\/jats:p>","DOI":"10.3390\/s26144521","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T03:12:38Z","timestamp":1784257958000},"page":"4521","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sensor-Based Monitoring of Heart-Rate Responses to Ball Type in 9\u201311-Year-Old Tennis Players: A Preliminary Bayesian Repeated-Measures Study"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-1837-0614","authenticated-orcid":false,"given":"Ana","family":"Piquer-Piquer","sequence":"first","affiliation":[{"name":"Research Group on Sport Technique and Tactics, University of Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7722-0058","authenticated-orcid":false,"given":"Jos\u00e9 Mar\u00eda","family":"Gim\u00e9nez-Egido","sequence":"additional","affiliation":[{"name":"Department of Physical Activity and Sport, University of Murcia, 30720 Murcia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2272-8217","authenticated-orcid":false,"given":"Jos\u00e9 Francisco","family":"Guzm\u00e1n","sequence":"additional","affiliation":[{"name":"Research Group on Sport Technique and Tactics, University of Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7952-7603","authenticated-orcid":false,"given":"Miguel","family":"Crespo","sequence":"additional","affiliation":[{"name":"Development Department, International Tennis Federation, London SW15 5XZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-7315-9297","authenticated-orcid":false,"given":"Manrique","family":"Rodr\u00edguez-Campos","sequence":"additional","affiliation":[{"name":"Research Group on Sport Technique and Tactics, University of Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8849-6463","authenticated-orcid":false,"given":"Rafael","family":"Mart\u00ednez-Gallego","sequence":"additional","affiliation":[{"name":"Research Group on Sport Technique and Tactics, University of Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"189","DOI":"10.2165\/00007256-200737030-00001","article-title":"Tennis Physiology","volume":"37","author":"Kovacs","year":"2007","journal-title":"Sports Med."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Jeffreys, I., and Moody, J. (2021). Strength and Conditioning for Tennis. Strength and Conditioning for Sports Performance, Routledge.","DOI":"10.4324\/9780429330988"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"528","DOI":"10.4100\/jhse.2011.63.07","article-title":"Functional Aspects of Competitive Tennis","volume":"6","author":"Belmonte","year":"2011","journal-title":"J. Hum. Sport Exerc."},{"key":"ref_4","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_5","doi-asserted-by":"crossref","first-page":"1030","DOI":"10.1136\/bjsports-2016-096581","article-title":"How Much Is Too Much? (Part 1) International Olympic Committee Consensus Statement on Load in Sport and Risk of Injury","volume":"50","author":"Soligard","year":"2016","journal-title":"Br. J. Sports Med."},{"key":"ref_6","first-page":"2205","article-title":"The Relationship between Reaction Time and Agility Performance in Young Athletes: A Study Using Perception\u2013Action Technological Devices","volume":"24","author":"Mancini","year":"2024","journal-title":"J. Phys. Educ. Sport"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Sierra-R\u00edos, J.V., Clemente, F.M., Teoldo, I., and Gonz\u00e1lez-V\u00edllora, S. (2021). Internal and External Load Variations in Young Students: Comparisons between Small-Sided Games and Small-Sided Games Combined with Strength Training during Physical Education Classes. Int. J. Environ. Res. Public Health, 18.","DOI":"10.3390\/ijerph18041926"},{"key":"ref_8","first-page":"444","article-title":"Estudio de La Carga Interna y Externa a Trav\u00e9s de Diferentes Instrumentos. Un Estudio de Casos En F\u00fatbol Formativo","volume":"5","author":"Feu","year":"2019","journal-title":"Sport. Sci. J. Sch. Sport Phys. Educ. Psychomot."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Marzano-Felisatti, J.M., Mart\u00ednez-Gallego, R., Pino-Ortega, J., Garc\u00eda-de-Alcaraz, A., Priego-Quesada, J.I., and Guzm\u00e1n Luj\u00e1n, J.F. (2024). Analysing Physical Performance Indicators Measured with Electronic Performance Tracking Systems in Men\u2019s Beach Volleyball Formative Stages. Sensors, 24.","DOI":"10.3390\/s24237524"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"387","DOI":"10.1136\/bjsm.2005.023168","article-title":"Intensity of Tennis Match Play","volume":"40","author":"Fernandez","year":"2006","journal-title":"Br. J. Sports Med."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Baiget, E., Fern\u00e1ndez-Fern\u00e1ndez, J., Iglesias, X., and Rodr\u00edguez, F.A. (2015). Tennis Play Intensity Distribution and Relation with Aerobic Fitness in Competitive Players. PLoS ONE, 10.","DOI":"10.1371\/journal.pone.0131304"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"880","DOI":"10.1177\/1747954116676115","article-title":"Training Intensity Distribution in Young Tennis Players","volume":"11","author":"Moreira","year":"2016","journal-title":"Int. J. Sports Sci. Coach."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"867","DOI":"10.5114\/biolsport.2023.121324","article-title":"Effects of Different Maturity Status on Change of Direction Performance of Youth Tennis Players","volume":"40","author":"Corbi","year":"2023","journal-title":"Biol. Sport"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"250","DOI":"10.1177\/19417381221083319","article-title":"The Association Between Chronological Age and Maturity Status on Lower Body Clinical Measurements and Asymmetries in Elite Youth Tennis Players","volume":"15","author":"Ayala","year":"2023","journal-title":"Sports Health"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Villafaina, S., Crespo, M., Mart\u00ednez-Gallego, R., and Fuentes-Garc\u00eda, J.P. (2022). Heart Rate Variability in Elite International ITF Junior Davis Cup Tennis Players. Biology, 12.","DOI":"10.3390\/biology12010017"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1007\/s40279-017-0750-y","article-title":"Modified Maturity Offset Prediction Equations: Validation in Independent Longitudinal Samples of Boys and Girls","volume":"48","author":"Malina","year":"2018","journal-title":"Sports Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"342","DOI":"10.1123\/pes.9.4.342","article-title":"Convergent Validity of the Physical Activity Questionnaire for Adolescents","volume":"9","author":"Kowalski","year":"1997","journal-title":"Pediatr. Exerc. Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1590\/S1135-57272009000300008","article-title":"Fiabilidad y Validez Del Cuestionario de Actividad F\u00edsica PAQ-A En Adolescentes Espa\u00f1oles","volume":"83","author":"Pozo","year":"2009","journal-title":"Rev. Esp. Salud Publica"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/02701367.2017.1413230","article-title":"Scaling Constraints in Junior Tennis: The Influence of Net Height on Skilled Players\u2019 Match-Play Performance","volume":"89","author":"Limpens","year":"2018","journal-title":"Res. Q. Exerc. Sport"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"320","DOI":"10.1080\/02640414.2014.942683","article-title":"The Effect of Ball Compression on the Match-Play Characteristics of Elite Junior Tennis Players","volume":"33","author":"Kachel","year":"2015","journal-title":"J. Sports Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1016\/j.concog.2014.07.004","article-title":"Scaling Sporting Equipment for Children Promotes Implicit Processes during Performance","volume":"30","author":"Buszard","year":"2014","journal-title":"Conscious. Cogn."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"723","DOI":"10.1080\/02640411003770238","article-title":"The Effect of Equipment Scaling on the Skill Acquisition of Beginning Tennis Players","volume":"28","author":"Farrow","year":"2010","journal-title":"J. Sports Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1726","DOI":"10.1177\/17479541221116875","article-title":"Influence of Scaling on Match Play Characteristics in Youth Tennis: A Systematic Review","volume":"18","author":"Chapelle","year":"2023","journal-title":"Int. J. Sports Sci. Coach."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"829","DOI":"10.1007\/s40279-015-0452-2","article-title":"Scaling the Equipment and Play Area in Children\u2019s Sport to Improve Motor Skill Acquisition: A Systematic Review","volume":"46","author":"Buszard","year":"2016","journal-title":"Sports Med."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Piquer-Piquer, A., Crespo, M., Ram\u00f3n-Llin, J., Guzm\u00e1n, J.F., and Mart\u00ednez-Gallego, R. (2025). Exploring the Impact of Equipment Modifications on Novice Tennis Players: A Scoping Review. Front. Psychol., 16.","DOI":"10.3389\/fpsyg.2025.1536427"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"21003","DOI":"10.1038\/s41598-020-77627-5","article-title":"Children\u2019s Coordination of the \u201cSweet Spot\u201d When Striking a Forehand Is Shaped by the Equipment Used","volume":"10","author":"Buszard","year":"2020","journal-title":"Sci. Rep."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3111","DOI":"10.1038\/s41598-020-59475-5","article-title":"Scaling Sports Equipment for Children Promotes Functional Movement Variability","volume":"10","author":"Buszard","year":"2020","journal-title":"Sci. Rep."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2746","DOI":"10.1080\/02640414.2021.1956217","article-title":"Scaling Junior Sport Competition: A Body-Scaling Approach?","volume":"39","author":"Broadbent","year":"2021","journal-title":"J. Sports Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1513","DOI":"10.1177\/17479541221114106","article-title":"Do Serve Distance and Net Height Modify Serve Biomechanics in Young Tennis Players?","volume":"18","author":"Fadier","year":"2023","journal-title":"Int. J. Sports Sci. Coach."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Touzard, P., Lecomte, C., Bideau, B., Kulpa, R., Fourel, L., Fadier, M., Cantin, N., and Martin, C. (2023). There Is No Rush to Upgrade the Tennis Racket in Young Intermediate Competitive Players: The Effects of Scaling Racket on Serve Biomechanics and Performance. Front. Psychol., 14.","DOI":"10.3389\/fpsyg.2023.1104146"},{"key":"ref_31","first-page":"323","article-title":"The Effects of Scaling Tennis Equipment on the Forehand Groundstroke Performance of Children","volume":"12","author":"Larson","year":"2013","journal-title":"J. Sports Sci. Med."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"43","DOI":"10.29081\/gsjesh.2017.18.2.03","article-title":"Specific Skills Development Using Appropriate Tools in the Tennis Game","volume":"18","author":"Prodan","year":"2017","journal-title":"Gymnasium"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"945","DOI":"10.1080\/02640414.2020.1737370","article-title":"Implementation of a Modified Sport Programme to Increase Participation: Key Stakeholder Perspectives","volume":"38","author":"Buszard","year":"2020","journal-title":"J. Sports Sci."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"37","DOI":"10.52383\/itfcoaching.v30i86.321","article-title":"Impact of the ITF Tennis Play and Stay Campaign on 10-and-under Tennis: The Views of Top National Federation Experts","volume":"30","author":"Jones","year":"2022","journal-title":"ITF Coach. Sport Sci. Rev."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"31","DOI":"10.52383\/itfcoaching.v27i79.82","article-title":"The Transition Process towards the Yellow Ball in Tennis Teaching","volume":"27","year":"2019","journal-title":"ITF Coach. Sport Sci. Rev."},{"key":"ref_36","first-page":"26","article-title":"Perceptions of Coaches of a Scaled Tennis Equipment Program","volume":"77","author":"Davies","year":"2019","journal-title":"ITF Coach. Sport Sci. Rev."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"829","DOI":"10.1080\/24748668.2014.11868761","article-title":"A Comparison between the Structure in Elite Tennis and Kids Tennis on Scaled Courts (Tennis 10s)","volume":"14","author":"Schmidhofer","year":"2014","journal-title":"Int. J. Perform. Anal. Sport"},{"key":"ref_38","first-page":"39","article-title":"An\u00e1lisis Del Golpeo de Fondo En J\u00f3venes Jugadores de Tenis En Una Competici\u00f3n Modificada Mediante Sensores Inteligentes","volume":"1","author":"Castellanos","year":"2020","journal-title":"JUMP"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"110011","DOI":"10.1016\/j.chaos.2020.110011","article-title":"Effect of Scaling Equipment on U-10 Players Tennis Serve during Match-Play: A Nonlinear Pedagogical Approach","volume":"139","author":"Palao","year":"2020","journal-title":"Chaos Solit. Fractals"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Gimenez-Egido, J.M., Ortega-Toro, E., Palao, J.M., Verd\u00fa-Conesa, I., and Torres-Luque, G. (2020). Effect of Modification Rules in Competition on Technical\u2013Tactical Action in Young Tennis Players (Under-10). Front. Psychol., 10.","DOI":"10.3389\/fpsyg.2019.02789"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1093","DOI":"10.1080\/02640414.2014.986498","article-title":"The Effect of Equipment Scaling on Children\u2019s Sport Performance: The Case for Tennis","volume":"33","author":"Timmerman","year":"2015","journal-title":"J. Sports Sci."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1080\/24748668.2017.1303977","article-title":"A Comparison of the Playing Structure in Elite Kids Tennis on Two Different Scaled Courts","volume":"17","author":"Bayer","year":"2017","journal-title":"Int. J. Perform. Anal. Sport"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"80","DOI":"10.1016\/j.humov.2018.01.007","article-title":"Effects of Scaling Task Constraints on Emergent Behaviours in Children\u2019s Racquet Sports Performance","volume":"58","author":"Fitzpatrick","year":"2018","journal-title":"Hum. Mov. Sci."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"2204","DOI":"10.1080\/02640414.2016.1261179","article-title":"Effects of Lawn Tennis Association Mini Tennis as Task Constraints on Children\u2019s Match-Play Characteristics","volume":"35","author":"Fitzpatrick","year":"2017","journal-title":"J. Sports Sci."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Kilit, B., Arslan, E., Soylu, Y., and Lane, A.M. (2024). Does Playing Tennis with a Low-Compression Ball Effect Psychophysiological Responses and Match Characteristics in Recreational Adult Players?. Sports, 12.","DOI":"10.3390\/sports12030080"},{"key":"ref_46","first-page":"40","article-title":"Analysis of the Temporary Aspects and Actions of the Game in Performance Junior Players and the Differences When Playing with Adapted Material","volume":"21","year":"2013","journal-title":"ITF Coach. Sport Sci. Rev."},{"key":"ref_47","unstructured":"(2026, July 12). International Tennis Federation ITF Rules of Tennis. Available online: https:\/\/www.itftennis.com\/media\/7221\/2026-rules-of-tennis-english.pdf."},{"key":"ref_48","unstructured":"(2026, July 12). RFET; CEAT Reglamento T\u00e9cnico de Competici\u00f3n 2025. Available online: https:\/\/www.rfet.es\/es\/rfet-transparencia-reglamentos-deportivos.html."},{"key":"ref_49","unstructured":"Sanz, D., and Soler, J. (2019). Tenis X Etapas. Plan de Desarrollo Del Jugador de Tenis, Real Federaci\u00f3n Espa\u00f1ola de Tenis."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"1042","DOI":"10.3758\/s13428-018-01189-8","article-title":"A Tutorial on Bayes Factor Design Analysis Using an Informed Prior","volume":"51","author":"Stefan","year":"2019","journal-title":"Behav. Res. Methods"},{"key":"ref_51","first-page":"128","article-title":"Bayes Factor Design Analysis: Planning for Compelling Evidence","volume":"25","author":"Wagenmakers","year":"2017","journal-title":"Psychon. Bull. Rev."},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Kim, M., Park, C., and Yoon, J. (2023). The Design of GNSS\/IMU Loosely-Coupled Integration Filter for Wearable EPTS of Football Players. Sensors, 23.","DOI":"10.3390\/s23041749"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1007\/BF00422166","article-title":"A Simple Method for Measurement of Mechanical Power in Jumping","volume":"50","author":"Bosco","year":"1983","journal-title":"Eur. J. Appl. Physiol. Occup. Physiol."},{"key":"ref_54","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_55","doi-asserted-by":"crossref","first-page":"813","DOI":"10.3758\/s13423-020-01798-5","article-title":"The JASP Guidelines for Conducting and Reporting a Bayesian Analysis","volume":"28","author":"Dablander","year":"2021","journal-title":"Psychon. Bull. Rev."},{"key":"ref_56","unstructured":"Bernardo, J.M., Dawid, A.P., Bayarri, M.J., Berger, J.O., Heckerman, D., Smith, A.F.M., and West, M. (2006). Bayesian Model Selection and Hypothesis Testing. Proceedings of the Eighth Valencia International Meeting, Valencia, Spain, 2\u20136 June 2006, Oxford University Press."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"439","DOI":"10.1037\/a0015251","article-title":"The Importance of Proving the Null","volume":"116","author":"Gallistel","year":"2009","journal-title":"Psychol. Rev."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"219","DOI":"10.3758\/s13423-017-1317-5","article-title":"How to Become a Bayesian in Eight Easy Steps: An Annotated Reading List","volume":"25","author":"Etz","year":"2018","journal-title":"Psychon. Bull. Rev."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Lee, M.D., and Wagenmakers, E.J. (2013). Bayesian Cognitive Modeling: A Practical Course, Cambridge University Press.","DOI":"10.1017\/CBO9781139087759"},{"key":"ref_60","unstructured":"Jeffreys, H. (1961). Theory of Probability, Oxford University Press. [3rd ed.]."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.jmp.2012.08.001","article-title":"Default Bayes Factors for ANOVA Designs","volume":"56","author":"Rouder","year":"2012","journal-title":"J. Math. Psychol."},{"key":"ref_62","first-page":"2","article-title":"What Are the Odds? A Practical Guide to Computing and Reporting Bayes Factors","volume":"7","author":"Jarosz","year":"2014","journal-title":"J. Probl. Solving"},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"291","DOI":"10.1177\/1745691611406923","article-title":"Statistical Evidence in Experimental Psychology","volume":"6","author":"Wetzels","year":"2011","journal-title":"Perspect. Psychol. Sci."},{"key":"ref_64","first-page":"1","article-title":"Bayesian Repeated-Measures Analysis of Variance: An Updated Methodology Implemented in JASP","volume":"6","author":"Wagenmakers","year":"2023","journal-title":"Adv. Methods Pract. Psychol. Sci."},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1002\/jae.623","article-title":"Model Uncertainty in Cross-country Growth Regressions","volume":"16","author":"Ley","year":"2001","journal-title":"J. Appl. Econom."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"419","DOI":"10.1093\/biomet\/84.2.419","article-title":"A Bayesian Perspective on the Bonferroni Adjustment","volume":"84","author":"Westfall","year":"1997","journal-title":"Biometrika"},{"key":"ref_67","unstructured":"JASP Team (JASP, 2024). JASP, version 0.95.0."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"1282","DOI":"10.1038\/s41562-021-01177-7","article-title":"Bayesian Analysis Reporting Guidelines","volume":"5","author":"Kruschke","year":"2021","journal-title":"Nat. Hum. Behav."},{"key":"ref_69","doi-asserted-by":"crossref","unstructured":"Sinkovic, F., Novak, D., Foretic, N., and Zemkov\u00e1, E. (2023). The Effects of Biological Age on Speed-Explosive Properties in Young Tennis Players. J. Funct. Morphol. Kinesiol., 8.","DOI":"10.3390\/jfmk8020048"},{"key":"ref_70","doi-asserted-by":"crossref","unstructured":"Rodr\u00edguez-Campos, M., Piquer-Piquer, A., Gim\u00e9nez-Egido, J.M., Ram\u00f3n-Llin, J., Francisco Guzm\u00e1n, J., S\u00e1nchez-Alcaraz, B., Vuckovic, G., and Mart\u00ednez-Gallego, R. (2026). Effects of Ball Type and Maturity Status on U10 Tennis Players Competition Load. Front. Psychol., 17.","DOI":"10.3389\/fpsyg.2026.1719947"},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1519\/SSC.0b013e31825760ea","article-title":"The Youth Physical Development Model: A New Approach to Long-Term Athletic Development","volume":"34","author":"Lloyd","year":"2012","journal-title":"Strength Cond. J."},{"key":"ref_72","first-page":"689","article-title":"Physical Fitness and Performance","volume":"34","author":"Mirwald","year":"2002","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_73","doi-asserted-by":"crossref","unstructured":"Lambrich, J., and Muehlbauer, T. (2025). Effects of Fatigue on Physiological, Physical Fitness, and Stroke Performance Related Parameters in Healthy Tennis Players: A Systematic Review and Meta-Analysis. Front. Sports Act. Living, 7.","DOI":"10.3389\/fspor.2025.1578914"},{"key":"ref_74","doi-asserted-by":"crossref","unstructured":"Bili\u0107, Z., O\u010di\u0107, M., Dukari\u0107, V., Petrinovi\u0107, L., and Barbaros, P. (2025). Effects of Physiological Load on Kinematic Variables Related to Tennis Serve Performance. Sports, 13.","DOI":"10.3390\/sports13070197"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"102407","DOI":"10.1016\/j.psychsport.2023.102407","article-title":"Perceived Self-Efficacy by Under-10 Tennis Players When Scaling the Equipment and Play Area","volume":"67","author":"Carvalho","year":"2023","journal-title":"Psychol. 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