Robotics saves energy during normal walking


The idea of using an exoskeleton to enhance a human body has been around for a while but for many reasons they are impractical so how about exosuits? 

A study in Science/Robotics has performed an experiment using a new type of multi-joint soft exosuit investigating if this new model saves energy during normal walking. Assistance was applied to the ankle and hip joints by the motor and tether mechanism. Seven participants walked on a treadmill at 1.5 meters per second under one unpowered and four powered conditions, where the peak moment applied at the ankle joint was varied from about 10 to 38% of biological ankle moment (equivalent to an applied force of 18.7 to 75.0% of body weight).

Overall this type of exosuit showed to make walking more efficient in terms of energy expended during walking as well as a reduced load for the hip and ankle muscles. The comfort and ease of the suit were easy and the only noticeable difference to the user was when stopped abruptly.
“The feeling is most noticeable when you turn it off after using it. Think of the sensation as sluggish and heavy legs”.

This is encouraging news as currently people with movement or neurological disorders have to rely on clunky or passive/dynamic orthoses (similar to the image above) which can be exhausting to use or require the user to alter the way they walk to maximise their effects. This suit however saved 23% of energy.

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