App and Bluetooth-controlled undergarment treats back pain

21 August 2017

Credit: Joe Howell | University of Vanderbilt

Vanderbilt University engineers have found an effective, electromechanical alternative to the often impractical (or just plain ungainly) wearable products that treat back pain.

A high majority of adults (including this study’s principle investigator himself, assistant professor Karl Zeilik) experience back pain, leading to an estimated $30 billion medical expenses in the US.

TV infomercials offer a world of potential solutions for back pain, but most of them have at least one of three problems: they’re unproven, unworkable or just plain unattractive. A team of Vanderbilt University engineers is changing this issue with a design that combines the science of biomechanics and advances in wearable tech to create a smart, mechanised undergarment.

Well over half of all adults will experience low back pain in their lifetimes, and the condition is estimated to cost $30 billion in medical expenses and more than $100 billion in lost productivity in the US annually.

Due to research lead Karl Zelik’s back pain, he had difficulty lifting his toddler son; he said such a problem had him thinking about wearable tech solutions: “I’m sick of Tony Stark and Bruce Wayne being the only ones with performance-boosting supersuits. We, the masses, want our own. The difference is that I’m not fighting crime. I’m fighting the odds that I’ll strain my back this week trying to lift my two-year-old.”

Evidence that the wearable tech works

The team’s testing suggests that the smart clothing offloads stress on the low back.

The device consists of two fabric sections, made of nylon canvas, Lycra, polyester and other materials, for the chest and legs. The sections are connected by sturdy straps across the middle back, with natural rubber pieces at the lower back and glutes.

The device is designed so that users engage it only when they need it. A simple double tap to the shirt engages the straps. When the task is done, another double tap releases the straps so the user can sit down, and the device feels and behaves similarly to normal clothes. The device also can be controlled by an app that the team created: users tap their phones to engage the smart clothing wirelessly via Bluetooth.

Eight subjects tested the device by leaning forward and lifting 25-pound and 55-pound weights while holding their position at 30, 60 and 90 degrees. Using motion capture, force plates and electromyography, Zelik’s team demonstrated that the device reduced activity in the lower back extensor muscles by an average of 15 to 45 percent for each task.

Credit: Joe Howell | University of Vanderbilt

“The next idea: can we use sensors embedded in the clothing to monitor stress on the low back, and if it gets too high, can we automatically engage this smart clothing?” Zelik said.

Back specialist sees potential

Dr. Aaron Yang, who specialises in nonsurgical treatment of the back and neck at Vanderbilt University Medical Center, is a co-investigator. He stresses the focus of this new technology is not for treating those with existing back pain; rather, it focuses on prevention by reducing stress and fatigue on the low back muscles.

Said Yang, “People are often trying to capitalise on a huge societal problem with devices that are unproven or unviable. This smart clothing concept is different. I see a lot of health care workers or other professionals with jobs that require standing or leaning for long periods. Smart clothing may help offload some of those forces and reduce muscle fatigue.”

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