SuperPowerful Women with Extra Layer of Muscles

Researchers at ETH Zurich have developed a wearable textile exomuscle that serves as an extra layer of muscles. They aim to use it to increase the upper body strength and endurance of people with restricted mobility.

My arms are simply getting weaker,” says Michael Hagmann, who was diagnosed with a rare form of muscular dystrophy known as Bethlem myopathy back in 2016. To compensate for the lack of muscle strength in his arms, Hagmann adjusts his movements in a way that results in poor posture and strain. Marie Georgarakis, a former doctoral student at ETH Zurich’s Sensory Motor Systems Lab, is familiar with the problem. “Although hospitals have numerous good therapy devices, they are often very expensive and unwieldy. And there are few technical aids that patients can use directly in their everyday lives and draw on for assistance in performing exercises at home. We want to close this gap,” says Georgarakis.

This idea led to the creation of the Myoshirt: a soft, wearable exomuscle for the upper body. It is a kind of vest with cuffs for the upper arms accompanied by a small box containing all the technology that is not used directly on the body. Working via sensors embedded in the fabric, a smart algorithm detects the wearer’s intentional movements and the amount of force required. A motor then shortens a cable in the fabric running parallel to the wearer’s muscles – a sort of artificial tendon – and in this way supports the desired movement. This assistance is always in tune with the user’s movements and can be tailored to their individual preferences. The user is always in control and can override the device at any time.

The researchers have recently tested this prototype for the first time in a study featuring 12 participants: ten people without any physical impairments, one person with muscular dystrophy (Michael Hagmann) and one person with a spinal cord injury. The results were promising: all participants were able to lift their arms and/or objects for much longer thanks to the exomuscle. Endurance increased by about a third in the healthy subjects and by roughly 60% in the participant with muscular dystrophy, while the participant with a spinal cord injury was even able to perform the exercises three times as long. The exomuscle made it less taxing on their muscles, with the overwhelming majority of the participants finding the device intuitive to use.

Source: https://ethz.ch/

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