{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T14:13:24Z","timestamp":1791987204686,"version":"4.4.0"},"reference-count":44,"publisher":"Journal of Sports Science and Medicine","license":[{"start":{"date-parts":[[2024,12,1]],"date-time":"2024-12-01T00:00:00Z","timestamp":1733011200000},"content-version":"am","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["jsportscimed"],"abstract":"<jats:p>This study aimed to compare the effects of unilateral (UT), bilateral (BT), and combined (UBT) plyometric training on muscular strength, power, and change-of-direction performance in youth male basketball players. Sixty-six male youth basketball players (age: 16.1 \u00b1 0.8 years) participated in this randomized experimental study, which lasted 8 weeks with a training frequency of 2 sessions per week. The UT group performed only single-leg plyometric exercises, while the BT group conducted similar plyometric drills using both feet. The UBT group combined both approaches, performing one session of UT and one session of BT each week. The players were evaluated at baseline and after the 8-week period using a force platform for the unilateral countermovement jump test (UCMJ), isometric squat test (IST), isometric knee flexor strength test (KFS), leg land and hold test (LHT), and 5-0-5 tests. The asymmetry between legs per outcome was measured using the symmetry angle. The UT, BT, and UBT all significantly improved outcomes in the IST, UCMJ, KFS, LHT, and 5-0-5 tests (p &lt; 0.05) following the intervention, with no significant differences among the three methods. However, while UT and UBT significantly reduced asymmetries in the tests (p &lt; 0.05), BT increased asymmetries. Only, the UT group showed significant improvements over the control group in asymmetry measures: IST asymmetry (mean difference: 1.2%, p = 0.049), KFS asymmetry (mean difference: 2.5%, p &lt; 0.001), and LHT asymmetry (mean difference: 1.1%, p = 0.013). While there are no substantial differences among UT, BT, and UBT in terms of improvements in unilateral tests and symmetry levels, UT stands out for its effectiveness in enhancing neuromuscular performance and reducing asymmetries among basketball players compared to the control condition. UT was the only method that showed significant benefits in this context. Strength and conditioning coaches might consider incorporating UT, either alone or alongside BT, to optimize individual limb strength and coordination.<\/jats:p>","DOI":"10.52082\/jssm.2024.754","type":"journal-article","created":{"date-parts":[[2024,10,8]],"date-time":"2024-10-08T12:12:11Z","timestamp":1728389531000},"page":"754-766","source":"Crossref","is-referenced-by-count":18,"title":["Effects of Unilateral, Bilateral and Combined Plyometric Jump Training on Asymmetry of Muscular Strength and Power, and Change-of-Direction in Youth Male Basketball Players"],"prefix":"10.52082","author":[{"given":"JianChun","family":"Cao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"SiHang","family":"Xun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ZhaoJin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"29163","published-online":{"date-parts":[[2024,12,1]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","unstructured":"Afonso J., Pe\u00f1a J., S\u00e1 M., Virgile A., Garc\u00eda-de-Alcaraz A., Bishop C. (2022) Why Sports Should Embrace Bilateral Asymmetry: A Narrative Review. Symmetry 14, 1993.  Crossref","DOI":"10.3390\/sym14101993"},{"key":"ref1","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Asadi A., Arazi H., Young W.B., de Villarreal E.S. (2016) The Effects of Plyometric Training on Change-of-Direction Ability: A Meta-Analysis. International Journal of Sports Physiology and Performance 11, 563-573.  Crossref","DOI":"10.1123\/ijspp.2015-0694"},{"key":"ref2","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Aztarain-Cardiel K., L\u00f3pez-Laval I., Marco-Contreras L.A., S\u00e1nchez-Sabat\u00e9 J., Garatachea N., Pareja-Blanco F. (2023) Effects of Plyometric Training Direction on Physical Performance in Basketball Players. International Journal of Sports Physiology and Performance 18, 135-141.  Crossref","DOI":"10.1123\/ijspp.2022-0239"},{"key":"ref3","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Behrens M., Mau-Moeller A., Mueller K., Heise S., Gube M., Beuster N., Herlyn P. K. E., Fischer D. C., Bruhn S. (2016) Plyometric training improves voluntary activation and strength during isometric, concentric and eccentric contractions. Journal of Science and Medicine in Sport 19, 170-176.  Crossref","DOI":"10.1016\/j.jsams.2015.01.011"},{"key":"ref4","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bettariga F., Turner A., Maloney S., Maestroni L., Jarvis P., Bishop C. (2022) The Effects of Training Interventions on Interlimb Asymmetries: A Systematic Review with Meta-analysis. Strength & Conditioning Journal 44, 69-86.  Crossref","DOI":"10.1519\/ssc.0000000000000701"},{"key":"ref5","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bishop C., Read P., Chavda S., Jarvis P., Turner A. (2019) Using Unilateral Strength, Power and Reactive Strength Tests to Detect the Magnitude and Direction of Asymmetry: A Test-Retest Design. Sports 7, 58.  Crossref","DOI":"10.3390\/sports7030058"},{"key":"ref6","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bishop C., Read P., Chavda S., Turner A. (2016) Asymmetries of the Lower Limb: The Calculation Conundrum in Strength Training and Conditioning. Strength & Conditioning Journal 38, 27-32.  Crossref","DOI":"10.1519\/ssc.0000000000000264"},{"key":"ref7","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bogdanis G.C., Tsoukos A., Kaloheri O., Terzis G., Veligekas P., Brown L.E. (2019) Comparison Between Unilateral and Bilateral Plyometric Training on Single- and Double-Leg Jumping Performance and Strength. Journal of Strength and Conditioning Research 33, 633-640.  Crossref","DOI":"10.1519\/jsc.0000000000001962"},{"key":"ref8","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Cherni Y., Hammami M., Jelid M.C., Aloui G., Suzuki K., Shephard R.J., Chelly M. S. (2021) Neuromuscular Adaptations and Enhancement of Physical Performance in Female Basketball Players After 8 Weeks of Plyometric Training. Frontiers in Physiology 11.  Crossref","DOI":"10.3389\/fphys.2020.588787"},{"key":"ref9","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Dapi G., Cleather D.J., Murray M. (2024) Cross-Education of Skill: Assessment of Overhand Throwing Using Product- and Process-Oriented Assessment. Research Quarterly for Exercise and Sport 1.  Crossref","DOI":"10.1080\/02701367.2024.2347990"},{"key":"ref10","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Drouzas V., Katsikas C., Zafeiridis A., Jamurtas A.Z., Bogdanis G.C. (2020) Unilateral Plyometric Training is Superior to Volume-Matched Bilateral Training for Improving Strength, Speed and Power of Lower Limbs in Preadolescent Soccer Athletes. Journal of Human Kinetics 74, 161-176.  Crossref","DOI":"10.2478\/hukin-2020-0022"},{"key":"ref11","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Fimland M.S., Helgerud J., Solstad G.M., Iversen V.M., Leivseth G., Hoff J. (2009) Neural adaptations underlying cross-education after unilateral strength training. European Journal of Applied Physiology 107, 723-730.  Crossref","DOI":"10.1007\/s00421-009-1190-7"},{"key":"ref12","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Fort-Vanmeerhaeghe A., Bishop C., Busc\u00e0 B., Aguilera-Castells J., Vicens-Bordas J., Gonzalo-Skok O. (2020) Inter-limb asymmetries are associated with decrements in physical performance in youth elite team sports athletes. Plos One 15, e0229440.  Crossref","DOI":"10.1371\/journal.pone.0229440"},{"key":"ref13","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Gonzalo-Skok O., S\u00e1nchez-Sabat\u00e9 J., Izquierdo-Lup\u00f3n L., S\u00e1ez de Villarreal E. (2019) Influence of force-vector and force application plyometric training in young elite basketball players. European Journal of Sport Science 19, 305-314.  Crossref","DOI":"10.1080\/17461391.2018.1502357"},{"key":"ref14","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Gonzalo-Skok O., Tous-Fajardo J., Suarez-Arrones L., Arjol-Serrano J.L., Casaj\u00fas J.A., Mendez-Villanueva A. (2017) Single-Leg Power Output and Between-Limbs Imbalances in Team-Sport Players: Unilateral Versus Bilateral Combined Resistance Training. International Journal of Sports Physiology and Performance 12, 106-114.  Crossref","DOI":"10.1123\/ijspp.2015-0743"},{"key":"ref15","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Heil J., Loffing F., B\u00fcsch D. (2020) The Influence of Exercise-Induced Fatigue on Inter-Limb Asymmetries: A Systematic Review. Sports Medicine - Open 6, 39.  Crossref","DOI":"10.1186\/s40798-020-00270-x"},{"key":"ref16","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Helme M., Tee J., Emmonds S., Low C. (2021) Does lower-limb asymmetry increase injury risk in sport? A systematic review. Physical Therapy in Sport 49, 204-213.  Crossref","DOI":"10.1016\/j.ptsp.2021.03.001"},{"key":"ref17","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Hopkins W.G., Marshall S.W., Batterham A.M., Hanin J. (2009) Progressive Statistics for Studies in Sports Medicine and Exercise Science. Medicine & Science in Sports & Exercise 41, 3-13.  Crossref","DOI":"10.1249\/mss.0b013e31818cb278"},{"key":"ref18","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Kirby T., McBride J.M., Larkin T.R., Haines T.L., Dayne A.M., Roberts A.R. (2010) Effect of Squat Depth On Vertical Jump Performance Variables. Journal of Strength and Conditioning Research 24, 1.  Crossref","DOI":"10.1097\/01.jsc.0000367149.63078.e2"},{"key":"ref19","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Koo T.K., Li M.Y. (2016) A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research. Journal of Chiropractic Medicine 15, 155-163.  Crossref","DOI":"10.1016\/j.jcm.2016.02.012"},{"key":"ref20","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Lynch A.E., Davies R.W., Allardyce J.M., Carson B.P. (2023) The Effect of Unilateral Versus Bilateral Strength Training on Isometric-Squat Peak Force and Interlimb Asymmetry in Young, Recreationally Strength-Trained Men. International Journal of Sports Physiology and Performance 18, 195-203.  Crossref","DOI":"10.1123\/ijspp.2022-0299"},{"key":"ref21","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Malisoux L., Francaux M., Nielens H., Theisen D. (2005) Stretch-shortening cycle exercises: an effective training paradigm to enhance power output of human single muscle fibers. Journal of Applied Physiology 100, 771-779.  Crossref","DOI":"10.1152\/japplphysiol.01027.2005"},{"key":"ref22","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Maloney S.J. (2019) The Relationship Between Asymmetry and Athletic Performance: A Critical Review. Journal of Strength and Conditioning Research 33, 2579-2593.  Crossref","DOI":"10.1519\/jsc.0000000000002608"},{"key":"ref23","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Mandorino M., J., Figueiredo A., Gjaka M., Tessitore A. (2023) Injury incidence and risk factors in youth soccer players: a systematic literature review. Part II: Intrinsic and extrinsic risk factors. Biology of Sport 40, 27-49.  Crossref","DOI":"10.5114\/biolsport.2023.109962"},{"key":"ref24","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Markovic G., Mikulic P. (2010) Neuro-Musculoskeletal and Performance Adaptations to Lower-Extremity Plyometric Training. Sports Medicine 40, 859-895.  Crossref","DOI":"10.2165\/11318370-000000000-00000"},{"key":"ref25","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine McBurnie A.J., Dos\u2019Santos T. (2022) Multidirectional Speed in Youth Soccer Players: Theoretical Underpinnings. Strength & Conditioning Journal 44, 15-33.  Crossref","DOI":"10.1519\/ssc.0000000000000658"},{"key":"ref26","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine McKay A.K.A., Stellingwerff T., Smith E.S., Martin D.T., Mujika I., Goosey-Tolfrey V.L., Sheppard J., Burke L. M. (2022) Defining Training and Performance Caliber: A Participant Classification Framework. International Journal of Sports Physiology and Performance 17, 317-331.  Crossref","DOI":"10.1123\/ijspp.2021-0451"},{"key":"ref27","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Mirwald R.L., Baxter-Jones A.D., Bailey D.A., Beunen G.P. (2002) An assessment of maturity from anthropometric measurements. Medicine & Science in Sports & Exercise 34, 689-694.  Crossref","DOI":"10.1249\/00005768-200204000-00020"},{"key":"ref28","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Mishra P., Pandey C., Singh U., Gupta A., Sahu C., Keshri A. (2019) Descriptive statistics and normality tests for statistical data. Annals of Cardiac Anaesthesia 22, 67.  Crossref","DOI":"10.4103\/aca.aca_157_18"},{"key":"ref29","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Moran J., Ramirez-Campillo R., Liew B., Chaabene H., Behm D.G., Garc\u00eda-Hermoso A., Izquierdo M., Granacher U. (2021) Effects of Bilateral and Unilateral Resistance Training on Horizontally Orientated Movement Performance: A Systematic Review and Meta-analysis. Sports Medicine 51, 225-242.  Crossref","DOI":"10.1007\/s40279-020-01367-9"},{"key":"ref30","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Nijem R.M., Galpin A.J. (2014) Unilateral Versus Bilateral Exercise and the Role of the Bilateral Force Deficit. Strength & Conditioning Journal 36, 113-118.  Crossref","DOI":"10.1519\/ssc.0000000000000085"},{"key":"ref31","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Pappas E., Hagins M., Sheikhzadeh A., Nordin M., Rose D. (2007) Biomechanical Differences Between Unilateral and Bilateral Landings from a Jump: Gender Differences. Clinical Journal of Sport Medicine 17, 263-268.  Crossref","DOI":"10.1097\/jsm.0b013e31811f415b"},{"key":"ref32","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ram\u00edrez-Campillo R., Burgos C.H., Henr\u00edquez-Olgu\u00edn C., Andrade D.C., Mart\u00ednez C., \u00c1lvarez C., Castro-Sep\u00falveda M., Marques M., Izquierdo M. (2015) Effect of Unilateral, Bilateral, and Combined Plyometric Training on Explosive and Endurance Performance of Young Soccer Players. Journal of Strength and Conditioning Research 29, 1317-1328.  Crossref","DOI":"10.1519\/jsc.0000000000000762"},{"key":"ref33","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ramirez-Campillo R., Garc\u00eda-Hermoso A., Moran J., Chaabene H., Negra Y., Scanlan A.T. (2022) The effects of plyometric jump training on physical fitness attributes in basketball players: A meta-analysis. Journal of Sport and Health Science 11, 656-670.  Crossref","DOI":"10.1016\/j.jshs.2020.12.005"},{"key":"ref34","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ramirez-Campillo R., Sanchez-Sanchez J., Gonzalo-Skok O., Rodr\u00edguez-Fernandez A., Carretero M., Nakamura F.Y. (2018) Specific Changes in Young Soccer Player\u2019s Fitness After Traditional Bilateral vs. Unilateral Combined Strength and Plyometric Training. Frontiers in Physiology 9.  Crossref","DOI":"10.3389\/fphys.2018.00265"},{"key":"ref35","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Rejc E., Zaccaron S., D\u2019Alleva M., Botter A., Lazzer S. (2024) Effects of Bilateral or Unilateral Plyometric Training of Lower Limbs on the Bilateral Deficit During Explosive Efforts. Journal of Musculoskeletal & Neuronal Interactions 24, 200-208.","DOI":"10.1249\/01.mss.0000402288.01913.a3"},{"key":"ref36","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Riemann B.L., Tray N.C., Lephart S.M. (2003) Unilateral Multiaxial Coordination Training and Ankle Kinesthesia, Muscle Strength, and Postural Control. Journal of Sport Rehabilitation 12, 13-30.  Crossref","DOI":"10.1123\/jsr.12.1.13"},{"key":"ref37","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Roso-Moliner A., Mainer-Pardos E., Cart\u00f3n-Llorente A., Nobari H., Pettersen S.A., Lozano D. (2023) Effects of a neuromuscular training program on physical performance and asymmetries in female soccer. Frontiers in Physiology 14.  Crossref","DOI":"10.3389\/fphys.2023.1171636"},{"key":"ref38","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ujakovi\u0107 F., \u0160arabon N. (2023) The Effects of Workload Difference Between Limbs in Plyometric and Strength Exercises in Reducing Asymmetry in Change of Direction Ability During Basketball Season. Journal of Strength and Conditioning Research 37, 2282-2288.  Crossref","DOI":"10.1519\/jsc.0000000000004573"},{"key":"ref39","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Vandervoort A.A., Sale D.G., Moroz J. (1984) Comparison of motor unit activation during unilateral and bilateral leg extension. Journal of Applied Physiology 56, 46-51.  Crossref","DOI":"10.1152\/jappl.1984.56.1.46"},{"key":"ref40","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Wen N., Dalbo V.J., Burgos B., Pyne D.B., Scanlan A.T. (2018) Power Testing in Basketball: Current Practice and Future Recommendations. Journal of Strength and Conditioning Research 32, 2677-2691.  Crossref","DOI":"10.1519\/jsc.0000000000002459"},{"key":"ref41","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Wrona H.L., Zerega R., King V.G., Reiter C.R., Odum S., Manifold D., Latorre K., Sell T. C. (2023) Ability of Countermovement Jumps to Detect Bilateral Asymmetry in Hip and Knee Strength in Elite Youth Soccer Players. Sports 11, 77.  Crossref","DOI":"10.3390\/sports11040077"},{"key":"ref42","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Zhang W., Chen X., Xu K., Xie H., Li D., Ding S., Sun J. (2023) Effect of unilateral training and bilateral training on physical performance: A meta-analysis. Frontiers in Physiology 14.  Crossref","DOI":"10.3389\/fphys.2023.1128250"},{"key":"ref43","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Zifchock R.A., Davis I., Higginson J., Royer T. (2008) The symmetry angle: A novel, robust method of quantifying asymmetry. Gait & Posture 27, 622-627.  Crossref","DOI":"10.1016\/j.gaitpost.2007.08.006"}],"container-title":["Journal of Sports Science and Medicine"],"original-title":[],"language":"en","deposited":{"date-parts":[[2024,10,8]],"date-time":"2024-10-08T12:12:15Z","timestamp":1728389535000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.jssm.org\/jssm-23-754.xml%3EFulltext"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,12,1]]},"references-count":44,"URL":"https:\/\/doi.org\/10.52082\/jssm.2024.754","archive":["Internet Archive"],"relation":{},"ISSN":["1303-2968"],"issn-type":[{"value":"1303-2968","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,12,1]]}}}