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Open AccessArticle

Familiarization and Reliability of the Isometric Knee Extension Test for Rapid Force Production Assessment

Faculty of Sport Sciences, Human Performance and Sports Science Laboratory, University of Murcia, 30720 Murcia, Spain
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Appl. Sci. 2020, 10(13), 4499; https://doi.org/10.3390/app10134499
Received: 9 June 2020 / Revised: 25 June 2020 / Accepted: 25 June 2020 / Published: 29 June 2020
(This article belongs to the Special Issue New Trends in Design Engineering)
Despite the rising interest in the use of portable force sensors during isometric exercises to inform on neuromuscular performance, the design of practical field-based methods to obtain reliable measures is an ongoing challenge. We aim at identifying the intra-session and test-retest reliability of a rapid, isometric knee extension test to evaluate the maximal voluntary concentric force (MVC), rate of force development (RFD) and impulse following a field-based approach. On two occasions, 14 athletes unfamiliar with the test completed three sets of 2 s ballistic contractions (as fast and hard as possible) with 30 s rest. Raw and filtered data were collected in real time using a portable force sensor. RFD and impulse were highly reliability during “late” phases of the contraction (0–250 ms) since the first session (coefficient of variation (CV) < 9.8%). Earlier phases (0–150 ms) achieved a moderate reliability after one familiarization session (CV < 7.1%). Measures at 0–50 ms did not reach sufficient reliability (CV~14%). MVC was accurately assessed. Dominant limbs were not importantly altered by the familiarization. In opposite, non-dominant limbs showed large variations. New evidence is provided about the positive effects of a single familiarization session to improve the reliability the isometric knee extension test for rapid force production assessment. Coaches and practitioners may benefit of from these findings to conduct practical and reliable assessments of the rapid force production using a portable force sensor and a field-based approach. View Full-Text
Keywords: biomechanics; strain gauge; strength; power; muscle activation; resistance training biomechanics; strain gauge; strength; power; muscle activation; resistance training
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MDPI and ACS Style

Courel-Ibáñez, J.; Hernández-Belmonte, A.; Cava-Martínez, A.; Pallarés, J.G. Familiarization and Reliability of the Isometric Knee Extension Test for Rapid Force Production Assessment. Appl. Sci. 2020, 10, 4499. https://doi.org/10.3390/app10134499

AMA Style

Courel-Ibáñez J, Hernández-Belmonte A, Cava-Martínez A, Pallarés JG. Familiarization and Reliability of the Isometric Knee Extension Test for Rapid Force Production Assessment. Applied Sciences. 2020; 10(13):4499. https://doi.org/10.3390/app10134499

Chicago/Turabian Style

Courel-Ibáñez, Javier; Hernández-Belmonte, Alejandro; Cava-Martínez, Alejandro; Pallarés, Jesús G. 2020. "Familiarization and Reliability of the Isometric Knee Extension Test for Rapid Force Production Assessment" Appl. Sci. 10, no. 13: 4499. https://doi.org/10.3390/app10134499

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