Connect with others who understand.

sign up log in
About mySMAteam

Connect with others who understand.

sign up log in
About mySMAteam
SMA
NEWS

Wearable Cyborg Limb Shows Promise as Walking Treatment for SMA

Posted on December 30, 2021
Article written by
Emily Wagner, M.S.
(Tsukuba University/Cyberdyne)

  • A recent study found that a wearable cyborg limb can be used to help people with neuromuscular disorders such as spinal muscular atrophy (SMA) regain mobility.
  • The study found that the Hybrid Assistive Limb (HAL) improved walking distance for participants, compared to those who used an assistive hoist.
  • The device proved safe to use and came with a few manageable side effects, such as back pain and mild skin irritation from wearing the device.

A newly developed wearable cyborg leg can help people with neuromuscular disorders, such as spinal muscular atrophy (SMA), walk again, a recent study has found. Researchers from several hospitals across Japan conducted a clinical trial to study the safety and efficacy of the Hybrid Assistive Limb in people with neuromuscular disorders undergoing physical therapy.

Developed by Japan’s Tsukuba University and robotics company Cyberdyne, the HAL connects to the wearer’s central nervous system (CNS) through electrodes placed on the skin. This allows for bio-electric signals for movement to be sent from the brain to the device, which helps the wearer move.

“Using these signals, HAL allows the wearer to perform the desired movements with their voluntary commands,” according to Brooks Rehabilitation. “The physical therapist can see these signals and adjust settings on the robot suit to amplify weak signals and focus on desired signals. Active use of these neural pathways for voluntary movement with feedback to the brain leads to an improved ability for the wearer to walk on their own.”

(A) Study participant walks with a hoist only. (B) Study participant walks with a hoist and HAL. (Tsukuba University/Cyberdyne)

Movement and Neuromuscular Disorders

Neuromuscular disorders are conditions in which there is damage to the nerve cells involved in movement. They are usually caused by rare changes in DNA that make it difficult for nerve cells to send signals for movement. In spinal muscular atrophy, the survival motor neuron (SMN) genes are mutated, so they cannot make enough healthy SMN proteins.

Assistive devices are available to help those with SMA, such as canes, walkers, and wheelchairs. However, for those who have more serious mobility issues, these devices may not be enough. Rehabilitation programs for individuals with neuromuscular disorders are useful in many cases but cannot restore muscle function.

According to the researchers, the HAL device is a safer, more effective alternative to traditional assistive devices used in rehabilitation programs. “In SMA, exercise training and active exercise therapy have been considered harmful because overexertion may worsen the disease,” Dr. Takashi Nakajima, director of Niigata National Hospital, told mySMAteam. “In contrast, gait exercise therapy with the newly developed HAL lower limb is safe and effective in improving gait function in patients with SMA and other neuromuscular disorders.”

Share your thoughts with others. Click here to add a comment.

HAL Improves Walking Distance and Speed Compared to Hoist

The study included a total of 24 participants with SMA, muscular dystrophy, and other neuromuscular disorders. The participants were divided into groups A and B, which determined what treatment they would receive first. Those in group A performed walking tests using only an assistive hoist — used as a control. Those in group B performed walking tests using the HAL. After nine sessions, the groups switched treatments so that they could be compared.

The two-minute walking test (2MWT) is a standard mobility test used to measure how far a person can walk in two minutes. Overall, the HAL significantly improved participants’ 2MWT score by almost 10.1 percent, helping them walk farther than with an assistive hoist alone. Researchers also saw significant improvements in speed and rate of walking — known as cadence — for the 10 minute walking test (10MWT).

The authors noted that it takes around five minutes to put the HAL on, and it was found to be safe for all users. Some participants reported side effects using the HAL, including back pain and skin irritation from the device and electrodes. These side effects were all manageable for the participants.

Taking the Next Steps With HAL

The authors told mySMAteam that they are interested in studying whether using the HAL together with other SMA treatments — such as nusinersen — can improve motor function in people with SMA type 2. They would also like to investigate whether the HAL combined with medication can be used to treat people with chronic type 3 SMA to improve and maintain gait.

Researchers in Japan have begun an observational study to answer these questions and better understand how HAL can be used to improve the lives of people with SMA.

All updates must be accompanied by text or a picture.
Emily Wagner, M.S. holds a Master of Science in biomedical sciences with a focus in pharmacology. She is passionate about immunology, cancer biology, and molecular biology. Learn more about her here.

Related articles

Spinal muscular atrophy (SMA) is a genetic, neuromuscular disorder. Because SMA is mostly driven...

Understanding How SMA Gene Therapy Works

Spinal muscular atrophy (SMA) is a genetic, neuromuscular disorder. Because SMA is mostly driven...
Spinal muscular atrophy (SMA) is a neuromuscular disorder that causes muscle weakness throughout...

Respiratory Equipment for SMA: What To Look For

Spinal muscular atrophy (SMA) is a neuromuscular disorder that causes muscle weakness throughout...
Until very recently, treatments for spinal muscular atrophy (SMA) could only manage symptoms....

Treatments for Spinal Muscular Atrophy (SMA)

Until very recently, treatments for spinal muscular atrophy (SMA) could only manage symptoms....
Physical therapy can help manage symptoms of SMA like contractures or scoliosis.There are...

Physical Therapy for SMA: How To Get the Most Out of PT

Physical therapy can help manage symptoms of SMA like contractures or scoliosis.There are...
About one-third of people with spinal muscular atrophy (SMA) are adults.Adults with SMA may have...

Treatment Options for Adults with SMA

About one-third of people with spinal muscular atrophy (SMA) are adults.Adults with SMA may have...
Costs for spinal muscular atrophy (SMA) medications are high, but financial assistance programs...

Tips for Staying on Spinal Muscular Atrophy (SMA) Therapies

Costs for spinal muscular atrophy (SMA) medications are high, but financial assistance programs...

Recent articles

The SMA community officially recognizes August as Spinal Muscular Atrophy Awareness Month. This...

SMA Awareness Month Is Here!

The SMA community officially recognizes August as Spinal Muscular Atrophy Awareness Month. This...
The Centers for Disease Control and Prevention (CDC) has approved a second COVID-19 booster shot...

What People With SMA Should Know About Getting a Second COVID-19 Booster Shot

The Centers for Disease Control and Prevention (CDC) has approved a second COVID-19 booster shot...
Historically, spinal muscular atrophy (SMA) has been difficult to diagnose. The doctors I saw as...

Learning Self-Advocacy at a Young Age: My Experiences

Historically, spinal muscular atrophy (SMA) has been difficult to diagnose. The doctors I saw as...
People in online gaming communities have a wide range of personalities, outlooks, and behaviors —...

Gaming With SMA: Beware of Trolls and Hackers

People in online gaming communities have a wide range of personalities, outlooks, and behaviors —...
Becoming a better gamer can enhance your enjoyment and expand your gaming opportunities. Getting...

Gaming With SMA: Leveling Up Your Gaming Skills

Becoming a better gamer can enhance your enjoyment and expand your gaming opportunities. Getting...
When you first get started with online gaming, finding friends can feel virtually impossible...

Gaming With SMA: Finding Friends in Online Gaming

When you first get started with online gaming, finding friends can feel virtually impossible...
SMA News
SMA News

Thank you for subscribing!

Become a member to get even more:

sign up for free

close