Soft robotic shorts enhance walking ease and independence

Soft robotic shorts enhance walking ease and independence
by Robert Schreiber
Munich, Germany (SPX) Nov 18, 2024

Researchers at the Technical University of Munich (TUM) have created robotic shorts designed to support individuals in walking more comfortably and with reduced energy expenditure. The innovation primarily aims to promote mobility and prolong the independence of older adults and those who may be frail. "You can walk slowly with the shorts but you can also jog," said TUM Professor Lorenzo Masia. "It's the same idea as an electric bike, but for walking."

The research team found that the robotic shorts, named WalkON, reduce energy use during movement. Tests show that a young person walking 500 meters uphill with the shorts expends 18% less energy compared to unaided walking. For an older adult walking 400 meters on flat ground, the reduction in energy expenditure exceeds 10%, a benefit akin to shedding six to ten kilograms of body weight.

Doctoral student Enrica Tricomi explained that the shorts use thin artificial tendons, attached from the thighs to a waist belt, which assist the hip flexors during the transition from standing to walking. A measuring device monitors hip movement and sends a signal to motors, timing the support precisely at the swing phase of walking. "The system recognizes movement speed, adapts to leg weight, and provides tailored support," Tricomi said. WalkON is designed to be easy to use, requiring no pre-settings and being ready for use within minutes.

Ensuring safety and control, especially for the elderly
Participants in a study rated their sense of control over WalkON highly, with average scores well over 6 on a seven-point scale. "Safety is crucial for older people," said Masia, noting that the system is targeted at those who are frail but not yet in need of a rollator.

Prof. Masia, now Deputy Director at the Munich Institute of Robotics and Machine Intelligence (MIRMI), highlighted that older adults and individuals with conditions such as weak hearts or lung diseases stand to benefit significantly. Walking can enhance metabolism, potentially improving health conditions and quality of life by boosting mobility and independence.

A future of modular exoskeletons
Unlike conventional rigid-frame exoskeletons sold in stores, WalkON is a soft garment similar in size to a small backpack. Tricomi, who has been refining the system for four years, believes future versions will be modular. "In a few years, you will be able to buy shorts, attach a motor, and connect two cables, making the system ready for use," she said. Prof. Masia envisions this setup enabling users to take on more ambitious outdoor activities, such as hiking in the mountains.

Research Report:Soft robotic shorts improve outdoor walking efficiency in older adults