{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T21:45:43Z","timestamp":1772142343431,"version":"3.50.1"},"reference-count":31,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2023,2,4]],"date-time":"2023-02-04T00:00:00Z","timestamp":1675468800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese Foundation for Science and Technology","award":["UIDB\/00447\/2020"],"award-info":[{"award-number":["UIDB\/00447\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, we aimed to assess sprinting using a developed instrument encompassing an inertial measurement unit (IMU) in order to analyze athlete performance during the sprint, as well as to determine the number of steps, ground contact time, flight time, and step time using a high-speed camera as a reference. Furthermore, we correlated the acceleration components (XYZ) and acceleration ratio with the performance achieved in each split time obtained using photocells. Six athletes (four males and two females) ran 40 m with the IMU placed on their fifth lumbar vertebra. The accuracy was measured through the mean error (standard deviation), correlation (r), and comparison tests. The device could identify 88% to 98% of the number of steps. The GCT, flight time, and step time had mean error rates of 0.000 (0.012) s, 0.010 (0.011) s, and 0.009 (0.009) s when compared with the high-speed camera, respectively. The step time showed a correlation rate of r = 0.793 (p = 0.001) with no statistical differences, being the only parameter with high accuracy. Additionally, we showed probable symmetries, and through linear regression models identified that higher velocities result in the maximum anteroposterior acceleration, mainly over 0\u201340 m. Our device based on a Wi-Fi connection can determine the step time with accuracy and can show asymmetries, making it essential for coaches and medical teams. A new feature of this study was that the IMUs allowed us to understand that anteroposterior acceleration is associated with the best performance during the 40 m sprint test.<\/jats:p>","DOI":"10.3390\/s23041761","type":"journal-article","created":{"date-parts":[[2023,2,6]],"date-time":"2023-02-06T02:06:43Z","timestamp":1675649203000},"page":"1761","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Accuracy and Interpretation of the Acceleration from an Inertial Measurement Unit When Applied to the Sprint Performance of Track and Field Athletes"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4179-1318","authenticated-orcid":false,"given":"Paulo","family":"Miranda-Oliveira","sequence":"first","affiliation":[{"name":"Interdisciplinary Research Centre Egas Moniz (CiiEM), Egas Moniz School of Health & Science, 2829-511 Almada, Portugal"},{"name":"School of Technology and Management (ESTG), Polytechnic of Leiria, 2411-901 Leiria, Portugal"},{"name":"Portuguese Athletics Federation (FPA), 2799-538 Oeiras, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5238-1069","authenticated-orcid":false,"given":"Marco","family":"Branco","sequence":"additional","affiliation":[{"name":"Escola Superior de Desporto de Rio Maior, Instituto Polit\u00e9cnico de Santar\u00e9m, 2040-413 Rio Maior, Portugal"},{"name":"Centro Interdisciplinar de Estudo da Performance Humana (CIPER), Faculdade Motricidade Humana da Universidade de Lisboa, 1495-751 Oeiras, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7273-8774","authenticated-orcid":false,"given":"Orlando","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Sport and Health Department, School of Health and Human Development, Universidad de \u00c9vora, 7000-671 \u00c9vora, Portugal"},{"name":"Comprehensive Health Research Center (CHRC), University of \u00c9vora, 7000-671 \u00c9vora, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1680","DOI":"10.1249\/MSS.0b013e318216ea37","article-title":"Technical ability of force application as a determinant factor of sprint performance","volume":"43","author":"Morin","year":"2011","journal-title":"Med. Sci. Sport. Exerc."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"838","DOI":"10.3389\/fbioe.2020.00838","article-title":"A Sensor Fusion Approach to the Estimation of Instantaneous Velocity Using Single Wearable Sensor During Sprint","volume":"8","author":"Apte","year":"2020","journal-title":"Front Bioeng Biotechnol."},{"key":"ref_3","first-page":"349","article-title":"Strength and power predictors of sports speed","volume":"19","author":"Cronin","year":"2005","journal-title":"J. Strength Cond. Res."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Kuznietsov, A. (2012, January 13\u201316). Inertial measurement system for performance evaluation of track and field sprinters. Proceedings of the 2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, Graz, Austria.","DOI":"10.1109\/I2MTC.2012.6229661"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"270","DOI":"10.1177\/1747954117716790","article-title":"Are accelerometers a valid tool for measuring overground sprinting symmetry?","volume":"13","author":"Serpell","year":"2018","journal-title":"Int. J. Sport. Sci. Coach."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.proeng.2014.06.009","article-title":"Assessment of Foot Kinematics During Steady State Running Using a Foot-mounted IMU","volume":"72","author":"Bailey","year":"2014","journal-title":"Procedia Eng."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"463","DOI":"10.1111\/sms.12946","article-title":"Sprint mechanics evaluation using inertial sensor-based technology: A laboratory validation study","volume":"28","author":"Setuain","year":"2018","journal-title":"Scand. J. Med. Sci. Sport."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1123","DOI":"10.1016\/j.jbiomech.2011.12.020","article-title":"Estimation of temporal parameters during sprint running using a trunk-mounted inertial measurement unit","volume":"45","author":"Bergamini","year":"2012","journal-title":"J. Biomech."},{"key":"ref_9","unstructured":"Schmidt, M., Rheinl\u00e4nder, C.C., Wille, S., Wehn, N., and Jaitner, T. (2016). Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing: Adjunct (UbiComp \u201916), Association for Computing Machinery."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"956889","DOI":"10.3389\/fspor.2022.956889","article-title":"Examination of a foot mounted IMU-based methodology for a running gait assessment","volume":"4","author":"Young","year":"2022","journal-title":"Front. Sport. Act Living"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1123\/jab.2016-0356","article-title":"Association of Sprint Performance With Ground Reaction Forces During Acceleration and Maximal Speed Phases in a Single Sprint","volume":"34","author":"Nagahara","year":"2018","journal-title":"J. Appl. Biomech."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1111\/sms.12389","article-title":"Sprint mechanics in world-class athletes: A new insight into the limits of human locomotion","volume":"25","author":"Rabita","year":"2015","journal-title":"Scand. J. Med. Sci. Sport."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3921","DOI":"10.1007\/s00421-012-2379-8","article-title":"Mechanical determinants of 100-m sprint running performance","volume":"112","author":"Morin","year":"2012","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"747","DOI":"10.1016\/j.proeng.2016.06.330","article-title":"IMU- based Determination of Stance Duration During Sprinting","volume":"147","author":"Schmidt","year":"2016","journal-title":"Procedia Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"270","DOI":"10.1016\/j.jsams.2009.01.005","article-title":"The use of a single inertial sensor to identify stride, step, and stance durations of running gait","volume":"13","author":"Lee","year":"2010","journal-title":"J. Sci. Med. Sport"},{"key":"ref_16","unstructured":"Bailey, G.P., and Harle, R. (2016, January 7). A Portable, Inexpensive Point-Tracking System for Validation of Wearable Biomechanics Sensors. Proceedings of the 4th International Congress on Sport Sciences Research and Technology Support, Porto, Portugal."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1007\/s12283-010-0043-2","article-title":"Validation of trunk mounted inertial sensors for analysing running biomechanics under field conditions, using synchronously collected foot contact data","volume":"12","author":"Wixted","year":"2010","journal-title":"Sports Eng."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Slawinski, J., Millot, B., Houel, N., and Dinu, D. (2020). Use of an Inertial Measurement System to Calculate Maximal Power during Running Sprint Acceleration: Comparison with the Radar System. Proceedings, 49.","DOI":"10.3390\/proceedings2020049023"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"444","DOI":"10.1080\/17461391.2019.1641557","article-title":"Thigh positioned wearable resistance affects step frequency not step length during 50\u2005m sprint-running","volume":"20","author":"Macadam","year":"2020","journal-title":"Eur. J. Sport Sci."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1291","DOI":"10.1080\/14763141.2020.1762720","article-title":"Thigh loaded wearable resistance increases sagittal plane rotational work of the thigh resulting in slower 50-m sprint times","volume":"21","author":"Macadam","year":"2022","journal-title":"Sport. Biomech."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Blauberger, P., Horsch, A., and Lames, M. (2021). Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions. Sensors, 21.","DOI":"10.3390\/s21217331"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1588","DOI":"10.1016\/j.jbiomech.2014.03.002","article-title":"A simple field method to identify foot strike pattern during running","volume":"7","author":"Giandolini","year":"2014","journal-title":"J. Biomech."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1016\/j.jbiomech.2017.08.010","article-title":"Sprint mechanics return to competition follow-up after hamstring injury on a professional soccer player: A case study with an inertial sensor unit based methodological approach","volume":"63","author":"Setuain","year":"2017","journal-title":"J. Biomech."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Camomilla, V., Bergamini, E., Fantozzi, S., and Vannozzi, G. (2018). Trends supporting the in-field use of wearable inertial sensors for sport performance evaluation: A systematic review. Sensors, 18.","DOI":"10.3390\/s18030873"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Benson, L.C., R\u00e4is\u00e4nen, A.M., Clermont, C.A., and Ferber, R. (2022). Is This the Real Life, or Is This Just Laboratory? A Scoping Review of IMU-Based Running Gait Analysis. Sensors, 22.","DOI":"10.3390\/s22051722"},{"key":"ref_26","first-page":"8","article-title":"Validation of an inertial measurement unit to determine countermovement jump height","volume":"16","author":"Nielsen","year":"2019","journal-title":"Asia-Pac. J. Sport. Med. Arthrosc. Rehabil. Technol."},{"key":"ref_27","unstructured":"Winter, A.D. (2005). Biomechanics and Motor Control of Human Movement, John Wiley & Sons, Inc. [3rd ed.]."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Miranda-Oliveira, P., Branco, M., and Fernandes, O. (2022). Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes. Sensors, 22.","DOI":"10.3390\/s22197186"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"670","DOI":"10.1080\/21681163.2021.1931963","article-title":"Comparison of the accuracy of a free 3D camera system with the Ariel performance system","volume":"9","author":"Branco","year":"2021","journal-title":"Comput. Methods Biomech. Biomed. Eng. Imaging Vis."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1249\/MSS.0b013e31818cb278","article-title":"Progressive statistics for studies in sports medicine and exercise science","volume":"41","author":"Hopkins","year":"2009","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1784","DOI":"10.1111\/sms.13093","article-title":"Kinetic demands of sprinting shift across the acceleration phase: Novel analysis of entire force waveforms","volume":"28","author":"Colyer","year":"2018","journal-title":"Scand. J. Med. Sci. 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