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Comparison of 2D video and electrogoniometry measurements of knee flexion angle during a countermovement jump and landing task |
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| Authors: | Erich Petushek Chris Richter David Donovan William P Ebben Phillip B Watts Randall L Jensen |
| Institution: | 1. Health, Physical Education and Recreation, Northern Michigan University, 1401 Presque Isle, Marquette, MI, 49855, USA 2. CLARITY-Centre for Sensor Web Technologies, Dublin City University, Dublin, 9, Ireland 3. Physics Department, Northern Michigan University, 1401 Presque Isle, Marquette, MI, 49855, USA 4. Health, Exercise Science and Sport Management, University of Wisconsin-Parkside, 900 Wood Road, Kenosha, WI, 53141, USA |
| Abstract: | Quantifying countermovement jump (CMJ) and landing knee flexion angle is important for performance and injury risk assessment. The purpose of the study was to compare electrogoniometer (El-Gon)- and video-derived CMJ and landing knee flexion angle. Twenty-two adults performed three CMJs while knee flexion angle was simultaneously assessed using an El-Gon and video. The average systematic offset (RMSE) of the El-Gon-derived knee flexion angle throughout the entire movement was 7.03°?±?2.69°. Excellent reliability was demonstrated by the El-Gon (ICCavg?=?0.92). Countermovement knee flexion angle, maximum landing knee flexion angle and flexion angle at maximum vertical ground reaction force were 12.0°, 10.9°, and 5.7° higher, respectively, when assessed using El-Gon (p?<?0.001), compared to video. Errors between instruments are likely due to El-Gon crosstalk, misalignment and/or axis determination. The El-Gon is a cost-effective and time-efficient alternative to video analysis for the assessment of knee flexion angle if the error is accounted for and the sensor is precisely attached. |
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