{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T00:44:10Z","timestamp":1771980250764,"version":"3.50.1"},"reference-count":35,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2022,9,22]],"date-time":"2022-09-22T00:00:00Z","timestamp":1663804800000},"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 the countermovement jump (CMJ) using a developed instrument encompassing an off-the-shelf Inertial Measurement Unit (IMU) in order to analyze performance during the contraction phase, as well as to determine the jump height and the modified reactive strength index (RSImod), using force plate (FP) data as reference. Eight athletes (six males and two females) performed CMJs with the IMU placed on their fifth lumbar vertebra. Accuracy was measured through mean error (standard deviation), correlation, and comparison tests. The results indicated high accuracy, high correlation (r), and no statistical differences between the IMU and the FP for contraction time (r = 0.902; \u03c1 &lt; 0.001), negative impulse phase time (r = 0.773; \u03c1 &lt; 0.001), flight time (r = 0.737; \u03c1 &lt; 0.001), jump time (r = 0.708; \u03c1 &lt; 0.001), RSImod (r = 0.725; \u03c1 &lt; 0.001), nor minimum force (r = 0.758; \u03c1 &lt; 0.001). However, the values related to the positive impulse phase did not have the expected accuracy, as we used different devices and positions. Our results demonstrated that our developed instrument could be utilized to identify the contraction phase, jump height, RSImod, and minimum force in the negative impulse phase with high accuracy, obtaining a signal similar to that of an FP. This information can help coaches and athletes with training monitoring and control, as the device has simpler applicability making it more systematic.<\/jats:p>","DOI":"10.3390\/s22197186","type":"journal-article","created":{"date-parts":[[2022,9,22]],"date-time":"2022-09-22T23:07:55Z","timestamp":1663888075000},"page":"7186","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes"],"prefix":"10.3390","volume":"22","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), Cooperativa de Ensino Superior CRL, 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"}]},{"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":[[2022,9,22]]},"reference":[{"key":"ref_1","first-page":"131","article-title":"Countermovement jump performance in elite male and female sprinters and high jumpers","volume":"135","author":"Philpott","year":"2020","journal-title":"J. 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