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Updated: Jun 1, 2026

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

Published on: January 20, 2019

ZeroG: overground gait and balance training system.

Joseph Hidler¹, David Brennan, Iian Black

¹Aretech, LLC, 21730 Red Rum Drive, Suite 112, Ashburn, VA 20147, USA. hidler@aretechllc.com

Journal of Rehabilitation Research and Development

|June 16, 2011

Summary

A novel ZeroG system aids patients with severe gait impairments by providing safe, controlled body-weight support during gait and balance training. This technology enables crucial practice for functional independence.

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Area of Science:

Rehabilitation Engineering
Biomechanics
Assistive Technology

Background:

Patients with severe gait impairments require specialized support for effective rehabilitation.
Existing systems may not offer sufficient dynamic unloading or precise control.
Overground body-weight support systems are crucial for gait and balance training.

Purpose of the Study:

To introduce and evaluate the performance of the ZeroG overground body-weight support system.
To assess the accuracy of the unloading system and trolley tracking capabilities.
To determine the system's suitability for gait and balance rehabilitation.

Main Methods:

Development of the ZeroG system featuring a custom-series elastic actuator for unloading.
Mounting the unloading system on a driven trolley for overhead rail movement.

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Performance evaluation through benchtop testing and human-subject trials.

Main Results:

The ZeroG unloading system demonstrated an average root-mean-square error of 2.2% and a peak error of 7.2%.
The trolley tracking system maintained position with errors less than 3 degrees.
The system provided up to 300 lb static and 150 lb dynamic support.

Conclusions:

The ZeroG system effectively provides controlled unloading and accurate tracking for gait rehabilitation.
The system's performance supports its use in enabling patients to practice critical functional activities.
ZeroG training has the potential to enhance functional independence for individuals with severe gait impairments.