Design and Evaluation of a Pneumatic-Actuated Active Balance Board for Sitting Postural Control

Area of Science:

• Rehabilitation Engineering
• Biomechanics
• Neuroscience

Background:

• Chronic low back pain (cLBP) impairs motor control and can lead to opioid dependence.
• Conventional rehabilitation often neglects adaptive motor responses to external challenges.
• Existing methods fail to adequately assess or retrain dynamic postural control.

Purpose of the Study:

• To design and evaluate a pneumatic-actuated active balance board for assessing seated postural control.
• To investigate the system's ability to induce adaptive motor responses using controlled external perturbations.
• To compare the effectiveness of the active board against passive systems in enhancing postural control.

Main Methods:

• Development of a balance board integrating pneumatic artificial muscles (PAMs), electromyography (EMG), and inertial measurement units (IMUs).
• Experimental trials with 15 healthy participants performing balance tasks on passive and active boards.
• Signal processing techniques including RMS, FFT, AR modeling, and Welch t-test for data analysis.

Main Results:

• The active balance board successfully induced adaptive motor responses and higher EMG activation compared to passive boards.
• Frequency-domain analyses revealed significant differences in muscle activation patterns.
• Results support the hypothesis that external perturbations improve postural control retraining.

Conclusions:

• The pneumatic-actuated balance board is a novel approach for assessing and potentially retraining postural control.
• This technology addresses limitations of traditional rehabilitation methods for cLBP.
• Future clinical trials are warranted to evaluate efficacy in cLBP patients.