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- Title
Validity of a Magnet-Based Timing System Using the Magnetometer Built into an IMU.
- Authors
Pérez-Chirinos Buxadé, Carla; Fernández-Valdés, Bruno; Morral-Yepes, Mónica; Tuyà Viñas, Sílvia; Padullés Riu, Josep Maria; Moras Feliu, Gerard
- Abstract
Inertial measurement units (IMUs) represent a technology that is booming in sports right now. The aim of this study was to evaluate the validity of a new application on the use of these wearable sensors, specifically to evaluate a magnet-based timing system (M-BTS) for timing short-duration sports actions using the magnetometer built into an IMU in different sporting contexts. Forty-eight athletes (22.7 ± 3.3 years, 72.2 ± 10.3 kg, 176.9 ± 8.5 cm) and eight skiers (17.4 ± 0.8 years, 176.4 ± 4.9 cm, 67.7 ± 2.0 kg) performed a 60-m linear sprint running test and a ski slalom, respectively. The M-BTS consisted of placing several magnets along the course in both contexts. The magnetometer built into the IMU detected the peak-shaped magnetic field when passing near the magnets at a certain speed. The time between peaks was calculated. The system was validated with photocells. The 95% error intervals for the total times were less than 0.077 s for the running test and 0.050 s for the ski slalom. With the M-BTS, future studies could select and cut the signals belonging to the other sensors that are integrated in the IMU, such as the accelerometer and the gyroscope.
- Subjects
TIME management; MAGNETOMETERS; MAGNETIC fields; UNITS of measurement; PHOTOELECTRIC cells; MAGNETS; SPRINTING; MAGNETIC sensors
- Publication
Sensors (14248220), 2021, Vol 21, Issue 17, p5773
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21175773