{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T05:10:37Z","timestamp":1778130637711,"version":"3.51.4"},"reference-count":38,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T00:00:00Z","timestamp":1777334400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001321","name":"National Research Foundation","doi-asserted-by":"crossref","award":["BK21 FOUR"],"award-info":[{"award-number":["BK21 FOUR"]}],"id":[{"id":"10.13039\/501100001321","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Pukyong National University Industry-university Cooperation Foundation\u2019s"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This study aimed to estimate vertical ground reaction force (vGRF) and lower-limb joint moments during football cutting movements using a trunk-mounted inertial measurement unit (IMU) combined with a Random Forest model, and to validate the feasibility of this approach. IMU data collected during 45\u00b0 cutting tasks were corrected using an Extended Kalman Filter (EKF). The model demonstrated good and consistent performance for vGRF (coefficient of determination, R2 = 0.766; correlation coefficient, r = 0.796) and sagittal plane moments of the ankle and knee (R2 = 0.661\u20130.689, r = 0.807\u20130.842). While Bland\u2013Altman analysis indicated low bias and generally good agreement, precision at the individual-trial level and accuracy for non-sagittal plane moments somewhat reflected the inherent within-player trial-to-trial variability in movement execution, particularly in non-sagittal loading patterns. It should be noted that performance estimates under the current trial-based validation design may differ from those obtained using a subject-independent framework such as leave-one-subject-out cross-validation. This study demonstrates that a single trunk-mounted IMU can reliably estimate key lower-limb loading patterns, providing a practical foundation for wearable-based kinetic monitoring in applied football settings.<\/jats:p>","DOI":"10.3390\/s26092741","type":"journal-article","created":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T15:09:33Z","timestamp":1777388973000},"page":"2741","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Development and Validation of a Kinetics Prediction Model for Football Cutting Using a Single Trunk-Mounted IMU"],"prefix":"10.3390","volume":"26","author":[{"given":"Inae","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Physical Education, Graduate School, Pukyong National University, Busan 48513, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-1673-0828","authenticated-orcid":false,"given":"Soo-ji","family":"Han","sequence":"additional","affiliation":[{"name":"Industry-University Cooperation Foundation, Pukyong National University, Busan 48513, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joong Hyun","family":"Ryu","sequence":"additional","affiliation":[{"name":"Performance Support & Analytics Section, Aspire Academy, Doha 22287, Qatar"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-9986-8599","authenticated-orcid":false,"given":"Sanghyuk","family":"Han","sequence":"additional","affiliation":[{"name":"Rehabilitation Department, Aspetar Orthopaedic and Sports Medicine Hospital, Doha 29222, Qatar"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinsung","family":"Yoon","sequence":"additional","affiliation":[{"name":"Fitogether Inc., Seoul 04378, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3802-568X","authenticated-orcid":false,"given":"Jongchul","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Marine Sports, Pukyong National University, Busan 48513, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,28]]},"reference":[{"key":"ref_1","first-page":"63","article-title":"Physical demands of different positions in FA Premier League soccer","volume":"6","author":"Bloomfield","year":"2007","journal-title":"J. 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