Engineering to enhance human mobility, play, and exploration
Congratulations, Claire, on finishing your undergraduate capstone and for providing a fantastic culminating presentation!
For her senior capstone, Claire was challenged with creating a web-based application clinicians could use to compute and translate muscle synergies into the clinic. Her mentors and fellow collaborators were Ben Shuman, Nick Baicoianu, and Dr. Kat Steele. In June, Claire will head to Boston, MA to begin her position at Delsys.
On May 18th, Claire Mitchell, Karley Benoff, and Makoto Eyre presented their research at the Mary Gates Undergraduate Research Symposium. These three students worked on year-long projects and showcased their hard work during a campus-wide poster session.
Claire’s research focused on creating a website and server framework for clinicians and researchers across the country to use for calculating muscle synergies for motor control analysis. Muscle synergies are an incredibly complex and computationally expensive analysis of electromyography data but provide quantification of motor control and assist in therapy prescription for movement disorders.
Karley and Mako’s research focused on designing and testing a 3D-printed elbow-driven orthosis for individuals with limited hand function. They drew inspiration from upper-extremity prosthetic devices and evaluated a voluntary close and voluntary open mechanism to assist an individual’s dominant limb.
Great work Karley, Mako, and Claire!
Journal article in Sensors:
In collaboration with University of Texas – Austin, we evaluated a new flexible, gold-based epidermal electrode for sensing muscle activity.
Background: Commercially available electrodes can only provide quality surface electromyography (sEMG) measurements for a limited duration due to user discomfort and signal degradation, but in many applications, collecting sEMG data for a full day or longer is desirable to enhance clinical care. Few studies for long-term sEMG have assessed signal quality of electrodes using clinically relevant tests. The goal of this research was to evaluate flexible, gold-based epidermal sensor system (ESS) electrodes for long-term sEMG recordings.
Methods: We collected sEMG and impedance data from eight subjects from ESS and standard clinical electrodes on upper extremity muscles during maximum voluntary isometric contraction tests, dynamic range of motion tests, the Jebsen Taylor Hand Function Test, and the Box & Block Test. Four additional subjects were recruited to test the stability of ESS signals over four days.
Results: Signals from the ESS and traditional electrodes were strongly correlated across tasks. Measures of signal quality, such as signal-to-noise ratio and signal-to-motion ratio, were also similar for both electrodes.
Conclusions: Over the four-day trial, no significant decrease in signal quality was observed in the ESS electrodes, suggesting that thin, flexible electrodes may provide a robust tool that does not inhibit movement or irritate the skin for long-term measurements of muscle activity in rehabilitation and other applications.
We are honored to have a 2018 Husky 100 member in our lab! The Husky 100 recognizes 100 UW undergraduate and graduate students from Bothell, Seattle, and Tacoma in all areas of study who are making the most of their time at the UW. Read an excerpt of Karley’s application packet below to learn more about her involvement with HuskyADAPT, her research with orthotic design, outreach, and her studies. Congratulations, Karley!
Expanding Your Horizons (EYH website) is a non-profit organization dedicated to providing gateway opportunities for female middle and high school students to become more involved in STEM activities and careers. Two of our Steele Lab teams participated. Michael Rosenberg and Momona Yamagami created a remote control car you can control using muscle activity, and engaged in hands-on learning with the young women. Members of the University of Washington’s HuskyADAPT (Accessible Design & Play Technology) team, including lab members Brianna Goodwin, Brandon Nguyen, and Karley Benoff, led a workshop yesterday on accessible design and adaptation of toys for children with varying abilities.
A total of 12 toys were adapted to incorporate a new switch mechanism to facilitate play, and 26 high school women learned about toy adaptation, soldering, and circuitry. Thank you to our HuskyADAPT team and our lab members for their dedication to outreach events!
