Details
| Original language | English |
|---|---|
| Qualification | Doctor of Engineering |
| Awarding Institution | |
| Supervised by |
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| Date of Award | 18 Jun 2024 |
| Place of Publication | Hannover |
| Publication status | Published - 12 Jun 2025 |
Abstract
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Hannover, 2025. 147 p.
Research output: Thesis › Doctoral thesis
}
TY - BOOK
T1 - Systems and algorithms for the mobile application of functional sports tests
AU - Webering, Fritz
PY - 2025/6/12
Y1 - 2025/6/12
N2 - This work presents a new concept for an interactive functional sports testing system based on wireless miniature inertial measurement units (IMUs) for use in the field. The design of a prototype of the proposed system is discussed, including algorithms for guiding the subject through functional tests, and for measuring joint angles and jump heights. The implemented active angle reproduction test for assessing the knee joint position sense is evaluated in a validation study with 31 subjects. With an ICC(3,1) of 0.93 to 0.99 when compared to the criterion reference (optical motion capture), the system is found to be accurate enough for practical application. The 95% limits of agreement of the angle difference measurements is -1.92° to +1.68°. A camera-based algorithm for calculating jump heights without required calibration is described and evaluated using simulations and a laboratory study. The simulation shows the accuracy of the algorithm under controlled conditions, with errors below 1 cm under good conditions, and errors of 2-4 cm under more realistic assumptions. The laboratory study shows 95% limits of agreement of -1.3 cm to +2.7 cm under real-world conditions when compared to a motion capture system, and an ICC(3,1) value of 0.801, confirming the good accuracy and reliability shown in simulations.
AB - This work presents a new concept for an interactive functional sports testing system based on wireless miniature inertial measurement units (IMUs) for use in the field. The design of a prototype of the proposed system is discussed, including algorithms for guiding the subject through functional tests, and for measuring joint angles and jump heights. The implemented active angle reproduction test for assessing the knee joint position sense is evaluated in a validation study with 31 subjects. With an ICC(3,1) of 0.93 to 0.99 when compared to the criterion reference (optical motion capture), the system is found to be accurate enough for practical application. The 95% limits of agreement of the angle difference measurements is -1.92° to +1.68°. A camera-based algorithm for calculating jump heights without required calibration is described and evaluated using simulations and a laboratory study. The simulation shows the accuracy of the algorithm under controlled conditions, with errors below 1 cm under good conditions, and errors of 2-4 cm under more realistic assumptions. The laboratory study shows 95% limits of agreement of -1.3 cm to +2.7 cm under real-world conditions when compared to a motion capture system, and an ICC(3,1) value of 0.801, confirming the good accuracy and reliability shown in simulations.
U2 - 10.15488/19103
DO - 10.15488/19103
M3 - Doctoral thesis
CY - Hannover
ER -