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Article

Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes

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Interdisciplinary Research Centre Egas Moniz (CiiEM), Cooperativa de Ensino Superior CRL, 2829-511 Almada, Portugal
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School of Technology and Management (ESTG), Polytechnic of Leiria, 2411-901 Leiria, Portugal
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Portuguese Athletics Federation (FPA), 2799-538 Oeiras, Portugal
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Escola Superior de Desporto de Rio Maior, Instituto Politécnico de Santarém, 2040-413 Rio Maior, Portugal
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Centro Interdisciplinar de Estudo da Performance Humana (CIPER), Faculdade Motricidade Humana da Universidade de Lisboa, 1495-751 Oeiras, Portugal
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Sport and Health Department, School of Health and Human Development, Universidad de Évora, 7000-671 Évora, Portugal
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Comprehensive Health Research Center (CHRC), University of Évora, 7000-671 Évora, Portugal
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Author to whom correspondence should be addressed.
Academic Editor: Filippo Zappasodi
Sensors 2022, 22(19), 7186; https://doi.org/10.3390/s22197186
Received: 20 August 2022 / Revised: 16 September 2022 / Accepted: 19 September 2022 / Published: 22 September 2022
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; ρ < 0.001), negative impulse phase time (r = 0.773; ρ < 0.001), flight time (r = 0.737; ρ < 0.001), jump time (r = 0.708; ρ < 0.001), RSImod (r = 0.725; ρ < 0.001), nor minimum force (r = 0.758; ρ < 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. View Full-Text
Keywords: IMU; CMJ; high-level athletes; contraction phase; modified reactive strength index (RSImod) IMU; CMJ; high-level athletes; contraction phase; modified reactive strength index (RSImod)
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MDPI and ACS Style

Miranda-Oliveira, P.; Branco, M.; Fernandes, O. Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes. Sensors 2022, 22, 7186. https://doi.org/10.3390/s22197186

AMA Style

Miranda-Oliveira P, Branco M, Fernandes O. Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes. Sensors. 2022; 22(19):7186. https://doi.org/10.3390/s22197186

Chicago/Turabian Style

Miranda-Oliveira, Paulo, Marco Branco, and Orlando Fernandes. 2022. "Accuracy of Inertial Measurement Units When Applied to the Countermovement Jump of Track and Field Athletes" Sensors 22, no. 19: 7186. https://doi.org/10.3390/s22197186

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