{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T02:51:43Z","timestamp":1788835903473,"version":"build-2803163510"},"reference-count":29,"publisher":"Public Library of Science (PLoS)","issue":"10","license":[{"start":{"date-parts":[[2023,10,13]],"date-time":"2023-10-13T00:00:00Z","timestamp":1697155200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100007397","name":"Univerzita Karlova v Praze","doi-asserted-by":"publisher","award":["PRIMUS\/22\/HUM\/019"],"award-info":[{"award-number":["PRIMUS\/22\/HUM\/019"]}],"id":[{"id":"10.13039\/100007397","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:sec id=\"sec001\"><jats:title>Purpose<\/jats:title><jats:p>Evidence directly comparing the effects of bilateral and unilateral conditioning activities is limited. Therefore, the aim of this study was to assess the acute effect of unilateral and bilateral conditioning activity on vastus lateralis stiffness, countermovement jump parameters, and 10 m sprint.<\/jats:p><\/jats:sec><jats:sec id=\"sec002\"><jats:title>Methods<\/jats:title><jats:p>Twelve semi-professional basketball players participated in this study (age: 23 \u00b1 4 yrs; body mass: 84.7 \u00b1 10.6 kg; body height: 192 \u00b1 6 cm; basketball training experience: 11 \u00b1 4 yrs) performed four experimental sessions to compare the acute effects of bilateral, stronger-only, weaker-only lower limb or no conditioning activity on vastus lateralis stiffness, countermovement jumps variables (height; peak velocity; peak force, contraction time, countermovement depth, and modified reactive strength index and 10 m sprint time. Measurements were performed 5 minutes before and in the 5<jats:sup>th<\/jats:sup>and 10<jats:sup>th<\/jats:sup>minutes after CA.<\/jats:p><\/jats:sec><jats:sec id=\"sec003\"><jats:title>Results<\/jats:title><jats:p>Bilateral conditioning activity significantly increase the countermovement jump height (p = 0.002; ES = 0.71) and the reactive strength index modified (p = 0.010; ES = 0.59). Moreover, a significantly higher peak force in the stronger than in the weaker limb was found (p&lt;0.001) without any differences between conditions and time points (p&gt;0.05). However, there were no significant (p&gt;0.05) interactions and effects of conditions or time-point in the case of the other countermovement jump variables, vastus lateralis stiffness, and 10m sprint time.<\/jats:p><\/jats:sec><jats:sec id=\"sec004\"><jats:title>Conclusion<\/jats:title><jats:p>Unilateral and bilateral drop jumps (3 sets of 5 repetitions) did not affect the vastus lateralis stiffness and time of the 10m sprint. However, only bilateral drop jumps effectively enhanced the countermovement jump height and modified reactive strength index. Bilateral drop jumps might be a useful part of a warm-up to improve jumping performance in basketball players.<\/jats:p><\/jats:sec>","DOI":"10.1371\/journal.pone.0292999","type":"journal-article","created":{"date-parts":[[2023,10,13]],"date-time":"2023-10-13T17:34:00Z","timestamp":1697218440000},"page":"e0292999","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":7,"title":["Acute effects of unilateral and bilateral conditioning activity on countermovement jump, linear speed, and muscle stiffness: A randomized crossover study"],"prefix":"10.1371","volume":"18","author":[{"given":"Piotr","family":"Biel","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mateusz","family":"Zubik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandra","family":"Filip-Stachnik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paulina","family":"Ewertowska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2797-8431","authenticated-orcid":true,"given":"Micha\u0142","family":"Krzysztofik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,10,13]]},"reference":[{"key":"pone.0292999.ref001","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1515\/hukin-2015-0197","article-title":"Optimizing post activation potentiation for explosive activities in competitive sports.","volume":"52","author":"A Go\u0142a\u015b","year":"2016","journal-title":"J Hum Kinet"},{"key":"pone.0292999.ref002","first-page":"5","article-title":"Does the warm-up effect subsequent post activation performance enhancement?","author":"MW O\u2019Grady","year":"2021","journal-title":"J Sport Exerc Sci."},{"key":"pone.0292999.ref003","doi-asserted-by":"crossref","first-page":"854","DOI":"10.1519\/JSC.0b013e31825c2bdb","article-title":"Meta-Analysis of Postactivation Potentiation and Power: Effects of Conditioning Activity, Volume, Gender, Rest Periods, and Training Status.","volume":"27","author":"JM Wilson","year":"2013","journal-title":"J Strength Cond Res."},{"key":"pone.0292999.ref004","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1007\/s40279-015-0415-7","article-title":"Factors Modulating Post-Activation Potentiation of Jump, Sprint, Throw, and Upper-Body Ballistic Performances: A Systematic Review with Meta-Analysis.","volume":"46","author":"LB Seitz","year":"2016","journal-title":"Sports Med."},{"key":"pone.0292999.ref005","doi-asserted-by":"crossref","first-page":"3122","DOI":"10.1519\/JSC.0000000000001393","article-title":"Acute Effects of Drop-Jump Protocols on Explosive Performances of Elite Handball Players.","volume":"30","author":"A Dello Iacono","year":"2016","journal-title":"J Strength Cond Res."},{"key":"pone.0292999.ref006","doi-asserted-by":"crossref","first-page":"10154","DOI":"10.3390\/ijerph181910154","article-title":"Unilateral and Bilateral Post-Activation Performance Enhancement on Jump Performance and Agility.","volume":"18","author":"A Escobar Hincapi\u00e9","year":"2021","journal-title":"Int J Environ Res Public Health"},{"key":"pone.0292999.ref007","first-page":"1455","article-title":"Post-activation potentiation effects on vertical and horizontal explosive performances of young handball and basketball athletes.","volume":"56","author":"A Dello Iacono","year":"2016","journal-title":"J Sports Med Phys Fitness"},{"key":"pone.0292999.ref008","first-page":"44","article-title":"Does handball throwing velocity increase after an eccentric overload-induced postactivation potentiation?","author":"P. 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