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Evaluation of a fall detector based on accelerometers: a pilot study.

U Lindemann1, A Hock, M Stuber

  • 1Robert-Bosch-Krankenhaus, Department of Geriatric Rehabilitation, Stuttgart, Germany. ulrich.lindemann@rbk.de

Medical & Biological Engineering & Computing
|January 18, 2006
PubMed
Summary

This study presents a novel head-mounted fall detector using accelerometers. The system accurately distinguishes daily activities from falls, offering improved sensitivity and specificity over existing devices for timely medical support.

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Area of Science:

  • Biomedical Engineering
  • Gerontology
  • Public Health

Background:

  • Falls and related injuries are a significant public health concern, necessitating effective detection methods.
  • Current home alarm systems often have limitations, particularly those worn at the hip.
  • Immediate fall detection is crucial for prompt medical intervention.

Purpose of the Study:

  • To develop and evaluate a head-level fall detection system using accelerometers.
  • To create an algorithm capable of differentiating between daily activities and simulated falls.
  • To assess the sensitivity and specificity of the novel fall detection system.

Main Methods:

  • Accelerometers were integrated into a behind-the-ear hearing aid housing.
  • An algorithm was developed to analyze acceleration and velocity patterns.

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  • Sensitivity was tested with intentional falls in a young volunteer; specificity was assessed during daily activities.
  • A healthy elderly individual wore the device for real-world data collection.

    • Main Results:

    • Three key thresholds were identified for fall recognition: sum-vector acceleration (xy-plane) > 2 g, sum-vector velocity > 0.7 m/s, and sum-vector acceleration (all components) > 6 g.
    • The algorithm successfully discriminated between daily living activities and intentional falls.
    • The developed system demonstrated high sensitivity and specificity, outperforming existing hip or wrist-worn detectors at a similar development stage.

    Conclusions:

    • A head-mounted accelerometer-based fall detector with a robust algorithm can reliably detect falls.
    • This technology offers a promising advancement over current fall detection systems, particularly for the elderly.
    • Improved fall detection can lead to faster medical response and potentially reduce fall-related injuries.