{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T13:51:23Z","timestamp":1785419483348,"version":"3.56.0"},"reference-count":51,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Psychol."],"abstract":"\n Objective<\/jats:title>\n This study aimed to investigate the effects of physical-mental mixed fatigue (PMF) on lower limb Biomechanics, Inter-joint Coordination and potential injury risk during landing task in elite American football players.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n Twelve male collegiate American football players were recruited. A randomized crossover controlled design was employed, wherein participants randomly completed baseline testing, physical fatigue (PF) intervention, and PMF intervention. PMF was induced utilizing a cycle ergometer protocol concurrently performed with a Stroop cognitive task. Kinematic and kinetic data during a landing task were synchronously collected using a Vicon motion capture system and force plates. Statistical comparisons were performed using repeated-measures analysis of variance.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n PMF specifically altered ankle joint kinematic patterns, manifested as a decreased ankle dorsiflexion angle (\n p<\/jats:italic>\n \u202f&lt;\u202f0.05) and an increased inversion angle (\n p<\/jats:italic>\n \u202f&lt;\u202f0.05) at the instant of peak vertical ground reaction force (vGRF), alongside an increased peak inversion angle throughout the landing cycle (\n p<\/jats:italic>\n \u202f&lt;\u202f0.05). However, neither PMF nor PF significantly affected hip or knee kinematics, joint range of motion (RoM), joint contribution strategy, lower limb coordination indices, or landing impact load indicators (\n p<\/jats:italic>\n \u202f&gt;\u202f0.05).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion<\/jats:title>\n The findings suggest that PMF specifically disrupts ankle biomechanics, potentially predisposing the joint to a posture that may be associated with higher injury risk. Nevertheless, highly trained athletes may utilize adaptive compensatory strategies developed through long-term training to maintain overall landing stability and impact load levels, thereby potentially offsetting the negative effects of PMF on neuromuscular control. When assessing injury risk associated with PMF, joint-level kinematic changes should be emphasized in addition to global indicators.<\/jats:p>\n <\/jats:sec>","DOI":"10.3389\/fpsyg.2026.1778145","type":"journal-article","created":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T04:51:50Z","timestamp":1782276710000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["The impact of physical-mental mixed fatigue on landing biomechanics inter-joint coordination and injury risk in elite American football players"],"prefix":"10.3389","volume":"17","author":[{"given":"Zilong","family":"Wang","sequence":"first","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huizi","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingyue","family":"Meng","sequence":"additional","affiliation":[{"name":"School of Physical Education, Soochow University","place":["Suzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bojie","family":"Xuan","sequence":"additional","affiliation":[{"name":"School of Physical Education, Ningbo University","place":["Ningbo, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanwu","family":"Zhu","sequence":"additional","affiliation":[{"name":"College of Physical Education and Sports, Beijing Normal University","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengfei","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Sports and Leisure, Dongshin University","place":["Naju, Jeollanam-do, Republic of Korea"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junzhu","family":"An","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiuxia","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physical Education, Soochow University","place":["Suzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangdong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,6,24]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"193","DOI":"10.1257\/aeri.20190252","article-title":"Statistical nonsignificance in empirical economics","volume":"2","author":"Abadie","year":"2020","journal-title":"Am. 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