{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T06:07:42Z","timestamp":1788934062030,"version":"build-2803163510"},"reference-count":36,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:00:00Z","timestamp":1788912000000},"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. Bioeng. Biotechnol."],"abstract":"<jats:p>\n                    Unanticipated change-of-direction (COD) maneuvers represent a key scenario for non-contact lower-limb injury exposure in sport. This study investigated how anticipation modulates lower-limb mechanics across varying cutting angles (45\u00b0, 90\u00b0, and 180\u00b0) to identify phase-specific dynamic joint vulnerabilities. Twenty-three high-level male soccer players performed anticipated (ANT) and unanticipated (UNA) COD tasks. Kinematics, kinetics, and muscle activation were analyzed using two-way repeated-measures ANOVA and Statistical Parametric Mapping (SPM1D). Significant angle effects occurred for temporal and force variables (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). At 45\u00b0, ANT showed higher impact forces and stiffness (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.01). Condition \u00d7 Angle interaction effects emerged for medial gastrocnemius preactivation (\n                    <jats:italic>p<\/jats:italic>\n                    = 0.004) and vastus medialis cushion (\n                    <jats:italic>p<\/jats:italic>\n                    = 0.007). SPM1D revealed interactions for CoM velocity (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.005), early-cushion knee angles (\n                    <jats:italic>p<\/jats:italic>\n                    = 0.034), and mid-cushion moments (\n                    <jats:italic>p<\/jats:italic>\n                    = 0.024). UNA-45 exhibited greater negative knee power during mid-cushion (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.001), while trunk lateral bending interaction occurred during early preactivation (\n                    <jats:italic>p<\/jats:italic>\n                    = 0.039). Anticipation effects were maximal at 45\u00b0, whereas 90\u00b0 and 180\u00b0 mechanics were primarily angle-driven (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.001). While 90\u00b0 and 180\u00b0 maneuvers provide a temporal buffer for movement reorientation, the 45\u00b0 task forces athletes to process extreme loads within a compressed timeframe. Under unanticipated conditions, altered feedforward neuromuscular preparation combined with an upright landing posture was accompanied by greater eccentric power absorption, indicating increased multi-planar mechanical demands. These findings suggest that 45\u00b0 UNA cutting may serve as a challenging biomechanical paradigm for examining biomechanical characteristics relevant to ACL injury mechanisms, revealing potential neuromuscular control adaptations under constrained preparation conditions that may remain less evident during larger-angle or pre-planned maneuvers.\n                  <\/jats:p>","DOI":"10.3389\/fbioe.2026.1895455","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T05:58:49Z","timestamp":1788933529000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Anticipation-angle interaction identifies 45\u00b0 unanticipated change of direction as a high-demand movement with altered ACL injury-related biomechanical characteristics"],"prefix":"10.3389","volume":"14","author":[{"given":"Chuangui","family":"Mao","sequence":"first","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shidong","family":"Xie","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziwen","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyu","family":"Guan","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuangai","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongyue","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiguo","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Physical Education and Health, Guangxi Normal University","place":["Guilin, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"e0302144","DOI":"10.1371\/journal.pone.0302144","article-title":"The effects of two different fatigue protocols on movement quality during anticipated and unanticipated change of directions in female soccer players","volume":"19","author":"Alimoradi","year":"2024","journal-title":"PLOS One"},{"key":"B2","doi-asserted-by":"publisher","first-page":"16","DOI":"10.1016\/j.asmart.2019.01.001","article-title":"The muscle pre-activity timing of the hamstrings and quadriceps during 180\u00b0 and 360\u00b0 rotational jump landings in healthy female subjects","volume":"17","author":"Bai","year":"2019","journal-title":"Asia-Pac J. 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