@misc{10481/108198,
year = {2025},
month = {11},
url = {https://hdl.handle.net/10481/108198},
abstract = {Reaction time (RT) is a key measure of neuromuscular and cognitive performance, but
most existing methods rely on laboratory equipment or focus on localized actions such
as finger taps or foot lifts, limiting their relevance for whole-body movements. In this
work, we present a portable inertial measurement unit (IMU)-based system specifically
designed to measure RT during sprint starts. The device integrates a triaxial accelerometer
(ICM-20948, ±16 g) and an ESP32 microcontroller, which generates an auditory stimulus,
acquires acceleration data at 1 kHz, and computes movement onset in real time. A fixed
acceleration threshold, determined from calibration against a high-speed camera reference, was used to detect the first voluntary movement. Both desktop and smartphone
applications were implemented to control the system, provide feedback, and store test
data. Validation experiments showed good agreement with the high-speed camera used
as a reference (R2 = 0.9391), with a mean bias of –1.35 ms and 95% limits of agreement
within ±25 ms. The proposed system combines high temporal resolution, portability, and
straightforward deployment, enabling reliable assessment of whole-body RT in realistic
sports and research environments.},
organization = {Consejo Superior de Deportes (project “SensorSportLab IV”)},
publisher = {MDPI},
keywords = {Reaction time},
keywords = {Inertial measurement unit (IMU)},
keywords = {Athletics},
title = {Enhanced Reaction Time Measurement System Based on 3D Accelerometer in Athletics},
doi = {10.3390/s25216730},
author = {Pousibet Garrido, Antonio and Moreno Pérez, Juan Antonio and Escobedo Araque, Pablo and Caraballo, Israel and Gutiérrez Manzanedo, José Vicente and González Montesinos, José L. and Carvajal Rodríguez, Miguel Ángel},
}