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This study evaluates the operational feasibility of a motion-capture system based on an inertial measurement unit for training head-orientation tasks. Because a single sensor is placed on the head without thoracic fixation, the system estimates head orientation relative to space rather than isolated cervical motion. The event-driven architecture is organised into five logical layers and uses an asynchronous publish\u2013subscribe bus for data acquisition, sensor fusion through the Madgwick filter, and local rendering in WebGL. A randomised pilot study involving 22 teenagers allocated to two parallel groups (11 per group) was conducted over eight weeks (three sessions per week). Participants were assigned to either the gamified system or a comparable active cervical exercise program. No participant-reported connectivity or hardware events prevented session completion. Self-reported adherence was 100%, and no adverse events were reported. Exploratory analyses showed that both groups reduced task completion time, whereas the reduction in time spent outside the target trajectory was statistically significant only in the experimental group; the between-group comparison of pre\u2013post changes was not statistically significant. These findings indicate the system\u2019s operational feasibility in healthy teenagers.<\/jats:p>","DOI":"10.3390\/s26196315","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T16:21:46Z","timestamp":1791303706000},"page":"6315","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Gamified IMU Sensor-Based System for Training Head-Orientation Tasks in Healthy Teenagers: Event-Driven Architecture and Randomised Pilot Feasibility Study"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4674-7025","authenticated-orcid":false,"given":"Andrea","family":"Calleja-Caballero","sequence":"first","affiliation":[{"name":"Department of Nursing and Physiotherapy, University of Salamanca, 37007 Salamanca, Spain"},{"name":"Neurorehabilitation Research Group, Institute of Biomedical Research of Salamanca (IBSAL), 37007 Salamanca, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1808-4364","authenticated-orcid":false,"given":"H\u00e9ctor","family":"S\u00e1nchez San-Blas","sequence":"additional","affiliation":[{"name":"Ontology Engineering Group, ETSI Inform\u00e1ticos, Polytechnic University of Madrid, 28223 Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"software","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6379-451X","authenticated-orcid":false,"given":"Josu\u00e9","family":"Prieto Prieto","sequence":"additional","affiliation":[{"name":"Instituto Universitario de Ciencias de la Educaci\u00f3n (IUCE), University of Salamanca, 37008 Salamanca, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2695-0250","authenticated-orcid":false,"given":"F\u00e1tima","family":"P\u00e9rez-Robledo","sequence":"additional","affiliation":[{"name":"Department of Nursing and Physiotherapy, University of Salamanca, 37007 Salamanca, Spain"},{"name":"Neurorehabilitation Research Group, Institute of Biomedical Research of Salamanca (IBSAL), 37007 Salamanca, Spain"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0976-2784","authenticated-orcid":false,"given":"Andr\u00e9 Filipe Sales","family":"Mendes","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Automation, University of Salamanca, 37008 Salamanca, Spain"},{"name":"CREA-Salud Research Group, Salamanca Primary Care Management, Institute of Biomedical Research of Salamanca (IBSAL), 37007 Salamanca, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"m791","DOI":"10.1136\/bmj.m791","article-title":"Global, regional, and national burden of neck pain in the general population, 1990\u20132017: Systematic analysis of the Global Burden of Disease Study 2017","volume":"368","author":"Safiri","year":"2020","journal-title":"BMJ"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Kazeminasab, S., Nejadghaderi, S.A., Amiri, P., Pourfathi, H., Araj-Khodaei, M., Sullman, M.J.M., Kolahi, A.A., and Safiri, S. 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