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Updated: Mar 15, 2026

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A High-Frequency Wearable IMU-Based System for Countermovement Jump Assessment.

Antonio Pousibet-Garrido1,2, Cristina Benavente2,3, Juan A Moreno-Pérez1

  • 1PRIMELab, Department of Electronics and Computer Technology, Centre for Information and Communications Technologies (CITIC-UGR), University of Granada, 18071 Granada, Spain.

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|March 14, 2026
PubMed
Summary

A new wearable inertial measurement unit (IMU) system offers a portable solution for assessing countermovement jumps (CMJ) in sports. This technology provides a viable alternative to costly force platforms for field-based neuromuscular performance monitoring.

Keywords:
Internet of Thingscountermovement jumpflight timeinertial measurement unitjump performance assessmentwireless accelerometer wearable sensors

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Area of Science:

  • Sports Science
  • Biomechanics
  • Wearable Technology

Background:

  • Countermovement jump (CMJ) assessment is crucial for monitoring athletic neuromuscular performance.
  • Traditional force platforms are expensive and lack portability, limiting field-based CMJ evaluations.
  • A need exists for accessible, portable CMJ assessment tools.

Purpose of the Study:

  • To develop and validate a custom wearable inertial measurement unit (IMU) system for assessing the countermovement jump (CMJ).
  • To provide a cost-effective and portable alternative to laboratory-based force platforms for CMJ analysis.
  • To evaluate the system's accuracy and reliability in field settings.

Main Methods:

  • Development of a custom system using a single IMU on the lower back, sampled at 1 kHz with Bluetooth Low Energy (BLE) communication.
  • Implementation of a novel algorithm utilizing the derivative of vertical acceleration to detect jump take-off and landing.
  • Validation against a criterion force platform using 119 CMJ trials from 19 participants.

Main Results:

  • The IMU system achieved a high detection rate of 97.43% for take-off and landing instants using an optimal 0.2 g acceleration threshold.
  • Flight time measurements showed a small systematic underestimation (bias = -0.0117 s) compared to the force platform.
  • Moderate limits of agreement were observed, indicating acceptable variability for practical applications.

Conclusions:

  • The developed wearable IMU system demonstrates suitability for practical, field-based CMJ monitoring in sports.
  • The system offers a portable and potentially more accessible method for assessing neuromuscular performance.
  • Users should consider the observed variability compared to force platforms, especially for critical individual performance decisions.