{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T20:36:33Z","timestamp":1775766993193,"version":"3.50.1"},"reference-count":26,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2024,1,11]],"date-time":"2024-01-11T00:00:00Z","timestamp":1704931200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>Limb asymmetry is an important consideration when evaluating rehabilitation progress or re-injury risk. The drop vertical jump (DVJ) task is commonly used to assess landing mechanics; however, the extent to which task setup influences limb asymmetry is unknown. Our purpose was to examine limb asymmetries across DVJ variations. We hypothesized that more demanding variations involving greater jump distance and target use would elicit greater landing asymmetries. Participants performed six DVJ variations while lower extremity joint kinematics and kinetics were collected. Joint angles and internal moments of the hip, knee and ankle were computed at initial contact and over the decent phase of the initial landing. The horizontal jump distance and the verbal instructions provided on how to jump off the box influenced limb asymmetries. The DVJ variation without a horizontal jump distance resulted in significant differences at the hip and knee; specifically, greater hip and knee flexion asymmetry (7.0\u00b0 and 15.2\u00b0 differences, respectively) were observed between limbs at initial contact. Instructions restricting take-off and landing strategies reduced asymmetry; this indicates that verbal instructions are critical to avoid altering natural landing mechanics. To best utilize DVJ as a tool, study protocols should be standardized to allow for more generalizable research and clinical findings.<\/jats:p>","DOI":"10.3390\/sym16010090","type":"journal-article","created":{"date-parts":[[2024,1,11]],"date-time":"2024-01-11T06:52:14Z","timestamp":1704955934000},"page":"90","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The Effects of Drop Vertical Jump Task Variation on Landing Mechanics: Implications for Evaluating Limb Asymmetry"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4246-2361","authenticated-orcid":false,"given":"Ashley L.","family":"Erdman","sequence":"first","affiliation":[{"name":"Scottish Rite for Children, Orthopedic and Sports Medicine Center, Frisco, TX 75034, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sophia","family":"Ulman","sequence":"additional","affiliation":[{"name":"Scottish Rite for Children, Orthopedic and Sports Medicine Center, Frisco, TX 75034, USA"},{"name":"Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Evan","family":"Suzman","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan Karel","family":"Petric","sequence":"additional","affiliation":[{"name":"Scottish Rite for Children, Orthopedic and Sports Medicine Center, Frisco, TX 75034, USA"},{"name":"Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8008-9495","authenticated-orcid":false,"given":"Alex M.","family":"Loewen","sequence":"additional","affiliation":[{"name":"Scottish Rite for Children, Orthopedic and Sports Medicine Center, Frisco, TX 75034, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sylvia","family":"\u00d5unpuu","sequence":"additional","affiliation":[{"name":"Connecticut Children\u2019s Medical Center, Center for Motion Analysis, Farmington, CT 06032, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ross","family":"Chafetz","sequence":"additional","affiliation":[{"name":"Shriners Hospitals for Children\u2014Philadelphia, Motion Analysis Center, Philadelphia, PA 19140, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kirsten","family":"Tulchin-Francis","sequence":"additional","affiliation":[{"name":"Nationwide Children\u2019s Hospital, Department of Orthopedic Surgery, Columbus, OH 43205, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1032-1767","authenticated-orcid":false,"given":"Tishya A. L.","family":"Wren","sequence":"additional","affiliation":[{"name":"Children\u2019s Hospital Los Angeles, Jackie and Gene Autry Orthopedic Center, Los Angeles, CA 90027, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"492","DOI":"10.1177\/0363546504269591","article-title":"Biomechanical measures of neuromuscular control and valgus loading of the knee predict anterior cruciate ligament injury risk in female athletes: A prospective study","volume":"33","author":"Hewett","year":"2005","journal-title":"Am. J. Sports Med."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"58","DOI":"10.4085\/1062-6050-51.12.20","article-title":"Preventive Neuromuscular Training for Young Female Athletes: Comparison of Coach and Athlete Compliance Rates","volume":"52","author":"Sugimoto","year":"2017","journal-title":"J. Athl. 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