Biomechanical and Physiological Evaluation of Multi-Joint Assistance With Soft Exosuits
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- 28 January 2016
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Neural Systems and Rehabilitation Engineering
- Vol. 25 (2), 119-130
- https://doi.org/10.1109/tnsre.2016.2523250
Abstract
To understand the effects of soft exosuits on human loaded walking, we developed a reconfigurable multi-joint actuation platform that can provide synchronized forces to the ankle and hip joints. Two different assistive strategies were evaluated on eight subjects walking on a treadmill at a speed of 1.25 m/s with a 23.8 kg backpack: 1) hip extension assistance and 2) multi-joint assistance (hip extension, ankle plantarflexion and hip flexion). Results show that the exosuit introduces minimum changes to kinematics and reduces biological joint moments. A reduction trend in muscular activity was observed for both conditions. On average, the exosuit reduced the metabolic cost of walking by ${\hbox{0.21}} \pm {\hbox{0.04}}~$ and ${\hbox{0.67}} \pm {\hbox{0.09}}~{\hbox{W/kg}}$ for hip extension assistance and multi-joint assistance respectively, which is equivalent to an average metabolic reduction of 4.6% and 14.6%, demonstrating that soft exosuits can effectively improve human walking efficiency during load carriage without affecting natural walking gait. Moreover, it indicates that actuating multiple joints with soft exosuits provides a significant benefit to muscular activity and metabolic cost compared to actuating single joint.
Keywords
Funding Information
- Defense Advanced Research Projects Agency (W911QX-12-C-0084)
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