Concurrent validity and reliability of torso-worn inertial measurement unit for jump power and height estimation |
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| Authors: | Timo Rantalainen Paul B Gastin Rhys Spangler Daniel Wundersitz |
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| Institution: | 1. Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia;2. Centre for Sport Research, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia;3. Centre for Sport Research, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia;4. Exercise Physiology, La Trobe Rural Health School, La Trobe University, Bendigo, Australia |
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| Abstract: | The purpose of the present study was to evaluate the concurrent validity and test-retest repeatability of torso-worn IMU-derived power and jump height in a counter-movement jump test. Twenty-seven healthy recreationally active males (age, 21.9 SD 2.0] y, height, 1.76 0.7] m, mass, 73.7 10.3] kg) wore an IMU and completed three counter-movement jumps a week apart. A force platform and a 3D motion analysis system were used to concurrently measure the jumps and subsequently derive power and jump height (based on take-off velocity and flight time). The IMU significantly overestimated power (mean difference = 7.3 W/kg; P < 0.001) compared to force-platform-derived power but good correspondence between methods was observed (Intra-class correlation coefficient ICC] = 0.69). IMU-derived power exhibited good reliability (ICC = 0.67). Velocity-derived jump heights exhibited poorer concurrent validity (ICC = 0.72 to 0.78) and repeatability (ICC = 0.68) than flight-time-derived jump heights, which exhibited excellent validity (ICC = 0.93 to 0.96) and reliability (ICC = 0.91). Since jump height and power are closely related, and flight-time-derived jump height exhibits excellent concurrent validity and reliability, flight-time-derived jump height could provide a more desirable measure compared to power when assessing athletic performance in a counter-movement jump with IMUs. |
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| Keywords: | Wearable Accelerometer Power Jump Methodology |
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