Project Overview

The degradation of the sense of touch (e.g. due to aging) on the bottom of our feet can compromise balance, leading to an increased risk for falls. Our project aims to build a shoe insole that uses passive, sub-sensory mechanical vibrations to enhance somatosensation in the feet. Such a system could thereby theoretically improve sensory information critical to maintenance of upright balance.

As background, it has previously been shown that actively generated vibrating insoles can improve balance in the elderly. The underlying phenomenon is termed 'stochastic resonance', in which sub-sensory noise acts to reduce sensory thresholds needed to detect plantar sensation. Although clinical studies suggest this is theoretically viable assistive technology, current insole designs are active and thus reliant on batteries and actuators. Active devices are not easily fit into a shoe and require periodic recharging. The complexity, cost, and maintenance of this implementation may limit the widespread use of the technology.

It is well recognized that we dissipate energy in each heel strike. Thus, we propose that it is theoretically possible that a vibrating insole could potentially be powered by passively harvesting energy during walking. Thus, this project involves designing a shoe insole with a completely passive vibration mechanism. The system should be low-cost, simple, and shown to generate sub-sensory, stochastic noise in the insole.

Team Picture

Contact Information

Team Members

• Brett Struthers - Team Leader
• Anna Tessling - Communicator
• Joseph Ashley - BSAC
• Kari Borowski - BWIG
• Brooke Aschbacher - BPAG

Advisor and Client

• Dr. Aaron Suminski - Advisor
• Prof. Darryl Thelen - Client
• Samuel Acuna - Alternate Contact

Related Projects

• Spring 2017: Vibrating Insoles
• Fall 2016: Passive vibrating insoles to improve balance during walking