{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T01:39:35Z","timestamp":1790818775871,"version":"4.1.0"},"reference-count":34,"publisher":"BMJ","issue":"1","license":[{"start":{"date-parts":[[2020,1,27]],"date-time":"2020-01-27T00:00:00Z","timestamp":1580083200000},"content-version":"unspecified","delay-in-days":26,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open Sport Exerc Med"],"accepted":{"date-parts":[[2020,1,8]]},"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:sec>\n                  <jats:title>Objective<\/jats:title>\n                  <jats:p>The purpose of this study was to determine the effect of fatigue level and sex on the range of motions of the lower extremities and impulses during the jump-landing phase after performing bilateral fatiguing tasks.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>In total, 41 healthy young adults volunteered for this study. Participants\u2019 jump-landing trajectories were monitored using nine cameras, and ground reaction forces were measured using a force plate. Participants performed five maximal bilateral countermovement jumps as prefatiguing tasks. The fatiguing tasks consisted of maximal effort contractions of the knee extensor at 60\u00b0\/s on a dynamometer until task failure, defined as the inability to reach 50% of the peak knee extension torque for three consecutive times. The post-task maximal bilateral jumps were immediately captured after the participants failed the fatiguing task. Participants were asked to perform this cycle again, performing the fatiguing contraction task until failure to reach 30% of the peak knee extension torque.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results and conclusion<\/jats:title>\n                  <jats:p>It was found that the knee joint was more extended in the post-30% fatiguing task, which was due to the reduction of the flexion angle of the hip and knee joints in response to fatigue level. The impulses for both sexes were reduced at the severe fatigue level. Fatigability altered jump-landing kinematics, jump heights and impulses in response to fatigue level. The post-30% fatiguing task elicited more fatigue than the post-50% fatiguing task.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/bmjsem-2019-000660","type":"journal-article","created":{"date-parts":[[2020,1,28]],"date-time":"2020-01-28T05:07:08Z","timestamp":1580188028000},"page":"e000660","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["Effect of knee extensor fatigue level and sex on bilateral jump-landing"],"prefix":"10.1136","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6292-6189","authenticated-orcid":false,"given":"Byungjoo","family":"Noh","sequence":"first","affiliation":[{"name":"Department of Health Care and Science, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7574-5259","authenticated-orcid":false,"given":"Chang Hong","family":"Youm","sequence":"additional","affiliation":[{"name":"Department of Health Care and Science, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Myeounggon","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Health Care and Science, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hwayoung","family":"Park","sequence":"additional","affiliation":[{"name":"Biomechanics Laboratory, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minji","family":"Son","sequence":"additional","affiliation":[{"name":"Biomechanics Laboratory, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinhee","family":"Kim","sequence":"additional","affiliation":[{"name":"Biomechanics Laboratory, College of Health Sciences, Dong-A University, Saha-gu, Busan, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2020,1,27]]},"reference":[{"key":"2025083112180085000_6.1.e000660.1","doi-asserted-by":"publisher","DOI":"10.1016\/S1466-853X(03)00037-3"},{"key":"2025083112180085000_6.1.e000660.2","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1123\/jab.13.1.24","article-title":"Kinesiological factors in vertical jump performance: differences among individuals","volume":"13","author":"Arag\u00f3n-Vargas","year":"1997","journal-title":"J Appl Biomech"},{"key":"2025083112180085000_6.1.e000660.3","doi-asserted-by":"crossref","first-page":"86","DOI":"10.1016\/S1440-2440(99)80187-X","article-title":"Normative data of vertical ground reaction forces during landing from a jump","volume":"2","author":"McNair","year":"1999","journal-title":"J Sci Med Sport"},{"key":"2025083112180085000_6.1.e000660.4","doi-asserted-by":"publisher","DOI":"10.1136\/bjsm.35.1.43"},{"key":"2025083112180085000_6.1.e000660.5","doi-asserted-by":"publisher","DOI":"10.1152\/physrev.2001.81.4.1725"},{"key":"2025083112180085000_6.1.e000660.6","doi-asserted-by":"crossref","first-page":"997","DOI":"10.1002\/j.2040-4603.2012.tb00427.x","article-title":"Skeletal muscle fatigue","volume":"2","author":"Kent-Braun","year":"2012","journal-title":"Compr Physiol"},{"key":"2025083112180085000_6.1.e000660.7","doi-asserted-by":"crossref","unstructured":"Gandevia SC , Allen GM , McKenzie DK . 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