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Summary
This summary is machine-generated.

This study introduces a portable IMU system for measuring whole-body reaction time (RT) during sprint starts. The device offers accurate, real-time RT assessment in sports settings.

Keywords:
athleticsinertial measurement unit (IMU)reaction time

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Area of Science:

  • Biomechanics
  • Sports Science
  • Wearable Technology

Background:

  • Reaction time (RT) is crucial for neuromuscular and cognitive performance.
  • Existing RT measurement methods often lack portability or focus on localized movements, limiting whole-body assessment.
  • There is a need for reliable, portable systems to measure RT in dynamic, whole-body activities like sprint starts.

Purpose of the Study:

  • To develop and validate a portable inertial measurement unit (IMU)-based system for measuring reaction time during sprint starts.
  • To enable real-time, accurate assessment of whole-body movement onset in sports and research environments.

Main Methods:

  • A portable IMU system integrating an accelerometer and microcontroller was developed.
  • The system generates auditory stimuli, acquires acceleration data at 1 kHz, and computes movement onset using a calibrated acceleration threshold.
  • Desktop and smartphone applications were created for system control, feedback, and data storage.

Main Results:

  • The IMU system demonstrated good agreement with high-speed camera measurements (R² = 0.9391).
  • Mean bias was -1.35 ms, with 95% limits of agreement within ±25 ms.
  • The system achieved high temporal resolution and real-time movement onset detection.

Conclusions:

  • The proposed IMU-based system provides a portable, reliable, and accurate method for assessing whole-body reaction time during sprint starts.
  • This technology facilitates straightforward deployment for realistic sports and research applications.
  • The system enhances the ability to evaluate neuromuscular and cognitive performance in dynamic contexts.