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Electrical Stimulation to Modulate Human Ankle Impedance: Effects of Intervention on Balance Control in Quiet and Perturbed Stances

Kozasa K, Pham DHH, Hirai H, Hori K, Niwa H, Fujihara R, Matsui K, Nishikawa A, Krebs HI (2020)

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Publication Type: Conference contribution

Publication year: 2020

Publisher: IEEE Computer Society

Book Volume: 2020-November

Pages Range: 258-263

Conference Proceedings Title: Proceedings of the IEEE RAS and EMBS International Conference on Biomedical Robotics and Biomechatronics

Event location: New York City, NY

ISBN: 9781728159072

DOI: 10.1109/BioRob49111.2020.9224274

Abstract

The ankle is the critical joint between the leg and foot that helps control physical interactions for propulsion, shock absorption, and balance of the body. This paper describes the effect of modulation of ankle impedance via functional electrical stimulation (FES) on balance control in humans while they are in quiet and perturbed stances. Subjects were instructed to stand on a computer-controlled treadmill while their kinematics and foot pressure were measured by an optical motion capture system and a force plate, respectively. The computer-controlled treadmill produced sinusoidal movement, which provided a mechanical perturbation to the subjects. While in quiet and perturbed stances, transcutaneous electrical stimulation with interferential current activated the agonist and antagonist muscles of the tibialis anterior and soleus muscles, which resulted in the co-contraction of the antagonistic ankle muscles. The experimental results show that simultaneous stimulation of the ankle antagonist muscle group using the interferential electrical stimulation (1) increases the root mean square (RMS) of the center of pressure (CoP) while in the quiet stance, and (2) decreases the RMS of the CoP and increases knee movement while in the perturbed stance. These findings highlight the different effects of FES-induced ankle impedance while in quiet and perturbed stances, suggesting that a simple modulation of ankle impedance via FES may not stabilize the postural sway in the quiet stance but rather may disturb it.

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How to cite

APA:

Kozasa, K., Pham, D.H.H., Hirai, H., Hori, K., Niwa, H., Fujihara, R.,... Krebs, H.I. (2020). Electrical Stimulation to Modulate Human Ankle Impedance: Effects of Intervention on Balance Control in Quiet and Perturbed Stances. In Proceedings of the IEEE RAS and EMBS International Conference on Biomedical Robotics and Biomechatronics (pp. 258-263). New York City, NY, US: IEEE Computer Society.

MLA:

Kozasa, Kohei, et al. "Electrical Stimulation to Modulate Human Ankle Impedance: Effects of Intervention on Balance Control in Quiet and Perturbed Stances." Proceedings of the 8th IEEE RAS/EMBS International Conference for Biomedical Robotics and Biomechatronics, BioRob 2020, New York City, NY IEEE Computer Society, 2020. 258-263.

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