{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T09:47:26Z","timestamp":1767260846596,"version":"build-2065373602"},"reference-count":35,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T00:00:00Z","timestamp":1588118400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003246","name":"Nederlandse Organisatie voor Wetenschappelijk Onderzoek","doi-asserted-by":"publisher","award":["P16-28, Project 6"],"award-info":[{"award-number":["P16-28, Project 6"]}],"id":[{"id":"10.13039\/501100003246","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Inertial sensor-based measurements of lower body kinematics in football players may improve physical load estimates during training sessions and matches. However, the validity of inertial-based motion analysis systems is specific to both the type of movement and the intensity at which movements are executed. Importantly, such a system should be relatively simple, so it can easily be used in daily practice. This paper introduces an easy-to-use inertial-based motion analysis system and evaluates its validity using an optoelectronic motion analysis system as a gold standard. The system was validated in 11 football players for six different football specific movements that were executed at low, medium, and maximal intensity. Across all movements and intensities, the root mean square differences (means \u00b1 SD) for knee and hip flexion\/extension angles were 5.3\u00b0 \u00b1 3.4\u00b0 and 8.0\u00b0 \u00b1 3.5\u00b0, respectively, illustrating good validity with the gold standard. In addition, mean absolute flexion\/extension angular velocities significantly differed between the three movement intensities. These results show the potential to use the inertial based motion analysis system in football practice to obtain lower body kinematics and to quantify movement intensity, which both may improve currently used physical load estimates of the players.<\/jats:p>","DOI":"10.3390\/s20092527","type":"journal-article","created":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T13:23:45Z","timestamp":1588166625000},"page":"2527","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Inertial Sensor-Based Motion Tracking in Football with Movement Intensity Quantification"],"prefix":"10.3390","volume":"20","author":[{"given":"Erik","family":"Wilmes","sequence":"first","affiliation":[{"name":"Amsterdam Movement Sciences, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, 1081BT Amsterdam, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0278-4235","authenticated-orcid":false,"given":"Cornelis J.","family":"de Ruiter","sequence":"additional","affiliation":[{"name":"Amsterdam Movement Sciences, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, 1081BT Amsterdam, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2599-557X","authenticated-orcid":false,"given":"Bram J. C.","family":"Bastiaansen","sequence":"additional","affiliation":[{"name":"Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands"}]},{"given":"Jasper F. J. A. van","family":"Zon","sequence":"additional","affiliation":[{"name":"Amsterdam Movement Sciences, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, 1081BT Amsterdam, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4294-6086","authenticated-orcid":false,"given":"Riemer J. K.","family":"Vegter","sequence":"additional","affiliation":[{"name":"Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands"}]},{"given":"Michel S.","family":"Brink","sequence":"additional","affiliation":[{"name":"Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands"}]},{"given":"Edwin A.","family":"Goedhart","sequence":"additional","affiliation":[{"name":"FIFA Medical Centre of Excellence, Royal Netherlands Football Association, 3707HX Zeist, The Netherlands"}]},{"given":"Koen A. P. M.","family":"Lemmink","sequence":"additional","affiliation":[{"name":"Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands"}]},{"given":"Geert J. 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Perf."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"2135","DOI":"10.1007\/s40279-017-0714-2","article-title":"Training Load Monitoring in Team Sports: A Novel Framework Separating Physiological and Biomechanical Load-Adaptation Pathways","volume":"47","author":"Vanrenterghem","year":"2017","journal-title":"Sports Med."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1888","DOI":"10.1177\/0363546507300823","article-title":"Neuromuscular and lower limb biomechanical differences exist between male and female elite adolescent soccer players during an unanticipated side-cut maneuver","volume":"35","author":"Landry","year":"2007","journal-title":"Am. J. Sports Med."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"805","DOI":"10.1080\/02640414.2010.481305","article-title":"The biomechanics of kicking in soccer: A review","volume":"28","author":"Lees","year":"2010","journal-title":"J. Sports Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"714","DOI":"10.1055\/s-0033-1358674","article-title":"Jumper\u2019s knee or lander\u2019s knee? A systematic review of the relation between jump biomechanics and patellar tendinopathy","volume":"35","author":"Diercks","year":"2014","journal-title":"Int. J. Sports Med."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1080\/24733938.2017.1282163","article-title":"Quantification of in-season training load relative to match load in professional Dutch Eredivisie football players","volume":"1","author":"Stevens","year":"2017","journal-title":"Sci. Med. Footb."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1226","DOI":"10.1177\/0363546510395879","article-title":"Epidemiology of muscle injuries in professional football (soccer)","volume":"39","author":"Ekstrand","year":"2011","journal-title":"Am. J. Sports Med."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1065","DOI":"10.1007\/s40279-015-0332-9","article-title":"The Use of Wearable Microsensors to Quantify Sport-Specific Movements","volume":"45","author":"Chambers","year":"2015","journal-title":"Sports Med."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"462","DOI":"10.1179\/1743288X11Y.0000000006","article-title":"The use of inertial sensors system for human motion analysis","volume":"15","author":"Williams","year":"2010","journal-title":"Phys. Ther. Rev."},{"key":"ref_11","first-page":"5975346","article-title":"Estimation of IMU and MARG orientation using a gradient descent algorithm","volume":"2011","author":"Madgwick","year":"2011","journal-title":"IEEE Int. Conf. Rehabil. Robot."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"78","DOI":"10.1016\/j.jbiomech.2005.11.011","article-title":"Ambulatory measurement of arm orientation","volume":"40","author":"Luinge","year":"2007","journal-title":"J. Biomech."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2678","DOI":"10.1016\/j.jbiomech.2009.08.004","article-title":"Inertial sensor-based knee flexion\/extension angle estimation","volume":"42","author":"Cooper","year":"2009","journal-title":"J. Biomech."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"3362","DOI":"10.1016\/j.jbiomech.2016.08.032","article-title":"Continuous three dimensional analysis of running mechanics during a marathon by means of inertial magnetic measurement units to objectify changes in running mechanics","volume":"49","author":"Reenalda","year":"2016","journal-title":"J. Biomech."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"732","DOI":"10.1080\/02640414.2014.962574","article-title":"Wearable inertial sensors in swimming motion analysis: A systematic review","volume":"33","author":"Magalhaes","year":"2015","journal-title":"J. Sports Sci."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Mooney, R., Corley, G., Godfrey, A., Quinlan, L.R., and \u00d3Laighin, G. (2016). Inertial sensor technology for elite swimming performance analysis: A systematic review. Sensors, 16.","DOI":"10.3390\/s16010018"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1016\/j.gaitpost.2008.04.003","article-title":"Joint kinematics estimate using wearable inertial and magnetic sensing modules","volume":"28","author":"Picerno","year":"2008","journal-title":"Gait Posture"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"N63","DOI":"10.1088\/0967-3334\/34\/8\/N63","article-title":"Concurrent validation of Xsens MVN measurement of lower limb joint angular kinematics","volume":"34","author":"Zhang","year":"2013","journal-title":"Physiol. Meas."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/j.jbiomech.2018.03.031","article-title":"Concurrent validation of an inertial measurement system to quantify kicking biomechanics in four football codes","volume":"73","author":"Blair","year":"2018","journal-title":"J. Biomech."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"56","DOI":"10.1186\/s12938-017-0347-6","article-title":"Inertial measurement systems for segments and joints kinematics assessment: Towards an understanding of the variations in sensors accuracy","volume":"16","author":"Lebel","year":"2017","journal-title":"Biomed. Eng. Online"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"218","DOI":"10.3389\/fphys.2018.00218","article-title":"Estimation of vertical ground reaction forces and sagittal knee kinematics during running using three inertial sensors","volume":"9","author":"Wouda","year":"2018","journal-title":"Front. Physiol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.humov.2014.10.003","article-title":"Evolution of match performance parameters for various playing positions in the English Premier League","volume":"39","author":"Bush","year":"2015","journal-title":"Hum. Mov. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"3555","DOI":"10.1016\/j.jbiomech.2007.05.026","article-title":"The effect of speed and influence of individual muscles on hamstring mechanics during the swing phase of sprinting","volume":"40","author":"Chumanov","year":"2007","journal-title":"J. Biomech."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"de Ruiter, C.J., and van Die\u00ebn, J.H. (2019). Stride and Step Length Obtained with Inertial Measurement Units during Maximal Sprint Acceleration. Sports, 7.","DOI":"10.3390\/sports7090202"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Bastiaansen, B.J.C., Wilmes, E., Brink, M.S., de Ruiter, C.J., Savelsbergh, G.J.P., Steijlen, A., Jansen, K.M.B., van der Helm, F.C.T., Goedhart, E.A., and van der Laan, D. (2020). An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field. JoVE, in press.","DOI":"10.3791\/60857"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1257","DOI":"10.1016\/0021-9290(95)00017-C","article-title":"ISB recommendations for standardization in the reporting of kinematic data","volume":"28","author":"Wu","year":"1995","journal-title":"J. Biomech."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Kuipers, J.B. (1999). Quaternions and Rotation Sequences, Princeton University Press.","DOI":"10.1515\/9780691211701"},{"key":"ref_28","unstructured":"Vicon\u00ae (2002). Plug-in-gait modelling instructions. Vicon\u00ae manual. Vicon\u00ae 612 Motion Systems, Oxford Metrics Ltd."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"543","DOI":"10.1016\/S0021-9290(01)00222-6","article-title":"ISB recommendation on definitions of joint coordinate system of various joints for the reporting of human joint motion\u2014Part I: Ankle, hip, and spine","volume":"35","author":"Wu","year":"2002","journal-title":"J. Biomech."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/0268-0033(95)91394-T","article-title":"Position and orientation in space of bones during movement: Anatomical frame definition and determination","volume":"10","author":"Cappozzo","year":"1995","journal-title":"Clin. Biomech"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"540","DOI":"10.1016\/j.gaitpost.2010.02.009","article-title":"A new formulation of the coefficient of multiple correlation to assess the similarity of waveforms measured synchronously by different motion analysis protocols","volume":"31","author":"Ferrari","year":"2010","journal-title":"Gait Posture"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s11517-009-0544-y","article-title":"First in vivo assessment of \u201cOutwalk\u201d: A novel protocol for clinical gait analysis based on inertial and magnetic sensors","volume":"48","author":"Ferrari","year":"2010","journal-title":"Med. Biol. Eng. Comput."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1029","DOI":"10.1016\/j.jbiomech.2007.12.003","article-title":"Ambulatory measurement of 3D knee joint angle","volume":"41","author":"Favre","year":"2008","journal-title":"J. Biomech."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.jbiomech.2017.03.015","article-title":"Measuring joint kinematics of treadmill walking and running: Comparison between an inertial sensor based system and a camera-based system","volume":"57","author":"Roos","year":"2017","journal-title":"J. Biomech."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"18625","DOI":"10.3390\/s141018625","article-title":"Estimating orientation using magnetic and inertial sensors and different sensor fusion approaches: Accuracy assessment in manual and locomotion tasks","volume":"14","author":"Bergamini","year":"2014","journal-title":"Sensors"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/9\/2527\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T14:09:26Z","timestamp":1760364566000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/9\/2527"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,29]]},"references-count":35,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2020,5]]}},"alternative-id":["s20092527"],"URL":"https:\/\/doi.org\/10.3390\/s20092527","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2020,4,29]]}}}