BoMI for Muscle Control

Body-Machine Interface for Recovering Muscle Control

People with spinal cord injury (SCI), stroke and other neurodegenerative disorders can follow two pathways for regaining independence and quality of life. One is through clinical interventions, including therapeutic exercises. The other is provided by assistive technologies, such as wheelchairs or robotic systems. In this study, we combine these two paths within a single framework by developing a new generation of body-machine interfaces (BoMI) supporting both assistive and rehabilitative goals. In particular, we focus on the recovery of muscle control by including a combination of motion and muscle activity signals in the operation of the BoMI.

Study Overview

• Status: Recruiting
• Conditions: Stroke; Spinal Cord Injury Cervical
• Intervention / Treatment: Device: Motion and Emg Control

Detailed Description

When suffering from conditions affecting the central nervous system, such as spinal cord injury (SCI), stroke or neurodegenerative disorders, two pathways are available for regaining independence and quality of life. One way is through clinical interventions, including therapeutic exercises, often in combination with pharmacological agents. The other is provided by assistive technologies, such as wheelchairs or robotic systems. These two approaches have conflicting characteristics. While rehabilitation exercises challenge patients to use the most affected parts of their musculoskeletal apparatus, assistive technologies are typically designed to bypass the disability. This has led to divergent research domains. In both fields there are three major gaps that we plan to address in the investigator's research:

1. High cost of technology and the limited amount of available hospital-based rehabilitation;
2. Lack of adaptability of currently available assistive technologies, such as head switches and sip-and puff devices, that require users to overcome a hard learning barrier;
3. Inadequate criteria for assessment of effectiveness of therapy, with common techniques still relying on subjective approaches that are inadequate considering the current state of biomedical science and technology.

We will address all of these issues by developing a new generation of body-machine interfaces (BoMI) supporting both assistive and rehabilitative goals. BMIs will translate movement signals and muscle activities of the user into control signals for assistive devices and computer systems. State-of-the-art systems for surface electromyography (EMG) and movement recording (IMU) will be integrated through machine learning techniques to facilitate sensorimotor learning while providing the means to promote or reduce the use of targeted muscles. New comprehensive assessment techniques will be developed by integrating standard measure of function - as the manual muscle test - with EMG analysis and non-invasive magnetic brain stimulation (TMS) (Magstim 200 Bistim, Whitland, UK). The development will be organized in three specific aims.

AIM 1: To develop a BMI integrating muscle activities and motion signals for operating external devices and performing rehabilitation exercises. EMG signals derived from multiple muscles in the upper body (e.g. deltoid, pectoralis, trapezius, triceps, etc.) will be integrated with motion signals to generate control signals for external devices (e.g. the coordinates of a cursor on a computer monitor or the speed and direction commands to a powered wheelchair). Both linear (PCA) and nonlinear maps (auto encoder networks) will be explored, although current preliminary evidence suggests that non-linear auto encoders (AE) are likely to better facilitate user learning1.

AIM 2: To enable targeting and modulating recruitment of specific muscles and muscle synergies during the practice of games and functional tasks. To enhance or reduce the role of a muscle or synergy, the output of the BoMI will be modulated in proportion to the deviation of the measured muscle activity from the desired level. The effectiveness of the approach will be tested at different times following training, both by tracking of motions and EMG activities during the performance of selected activities of daily living (ADL) and trough the assessment of muscle responses evoked by non-invasive brain stimulation.

AIM 3: To promote the adoption of the BoMI by facilitating access to its functions by patients and therapists and by performing an observational study on uptake in the DayRehabTM environment. The Shirley Ryan Ability Lab has established a unique environment in which spinal cord injured and stroke outpatients engage in daily rehabilitation exercises in close physical proximity with researchers. We will seize this opportunity to introduce the BoMI in the context of clinical therapy thus allowing a direct assessment of acceptance by therapists and clients.

• Study Type: Interventional
• Enrollment (Anticipated): 60
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Ferdinando Mussa-Ivaldi, PhD; Phone Number: 312 238 1230; Email: sandro@northwestern.edu
• Study Contact Backup: Name: Dalia De Santis, PhD; Phone Number: 312 238 1650; Email: ddesantis@sralab.org

Study Locations

• United States
  • Illinois
    • Chicago, Illinois, United States, 60611
      • Recruiting
      • Shirley Ryan Ability Lab
      • Contact: Ferdinando Mussa-Ivaldi, PhD; Phone Number: 312-238-1230; Email: sandro@northwestern.edu

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years to 65 years (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

1. Uninjured individuals

   Inclusion criteria:

   • Ages 18 and up.
   • Ability to follow simple commands, and to respond to questions.

   Exclusion criteria for SCI participants:

   • Does not meet the inclusion criteria.

2. Individuals with SCI

   Inclusion criteria:

   • Age 16-65
   • Injuries at the C3-6 level, complete (ASIA A), or incomplete (ASIA B and C).
   • Able to follow simple commands
   • Able to speak or respond to questions

   Exclusion criteria:

   • Presence of tremors, spasm and other significant involuntary movements
   • Cognitive impairment
   • Deficit of visuo-spatial orientation
   • Concurrent pressure sores or urinary tract infection
   • Other uncontrolled infection, concurrent cardiovascular disease
   • Sitting tolerance less than one hour
   • Severe hearing or visual deficiency
   • Miss more than six appointments without notification
   • Unable to comply with any of the procedures in the protocol
   • Unable to provide informed consent
3. Stroke survivors:

Inclusion criteria:

• Recent stroke (Sub acute to early chronic, between 3 and 12 months from CVA)
• Age less than 75 (To avoid age-related confounds)
• Inability to operate a manual wheelchair
• Available medical records and radiographic information about lesion locations
• Significant level of hemiparesis (UE Fugl Meyer score between 10 and 30)
• Presence of pathological muscle synergies in the UE (flexor and/or extensor synergy)

Exclusion criteria:

• Aphasia, apraxia, cognitive impairment or affective dysfunction that would influence the ability to perform the experiment
• Inability to provide informed consent
• Severe spasticity, contracture, shoulder subluxation, or UE pain
• Severe current medical problems, including rheumatoid arthritis or other orthopaedic impairments restricting finger or wrist movement

Additional exclusion criteria for participants enrolled in TMS procedures

• Any metal in head with the exception of dental work or any ferromagnetic metal elsewhere in the body. This applies to all metallic hardware such as cochlear implants, or an Internal Pulse Generator or medication pumps, implanted brain electrodes, and peacemaker.
• Personal history of epilepsy (untreated with one or a few past episodes), or treated patients
• Vascular, traumatic, tumoral, infectious, or metabolic lesion of the brain, even without history of seizure, and without anticonvulsant medication
• Administration of drugs that potentially lower seizure threshold [REF], without concomitant administration of anticonvulsant drugs which potentially protect against seizures occurrence
• Change in dosage for neuro-active medications (Baclophen, Lyrica, Celebrex, Cymbalta, Gabapentin, Naprosyn, Diclofenac, Diazepam, Tramadol, etc) within 2 weeks of any study visit.
• Skull fractures, skull deficits or concussion within the last 6 months
• unexplained recurring headaches
• Sleep deprivation, alcoholism
• Claustrophobia precluding MRI
• Pregnancy

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: SCI	Device: Motion and Emg Control; We will consider two methods for integrating motions and EMG signals: Direct methods. Signals extracted from the latent EMG space will directly contribute to the control of the external device. We will integrate EMG and IMU in two ways. In a first scenario, EMG and IMU will be given variable weight in the control. In a second scenario (perturbative method) the distance of ongoing muscle patterns from a desired set of strategies will modulate the mapping from body to cursor motions in the form of assistive (i.e. the cursor moves faster towards the target) or resistive (i.e. the cursor slows down) influences on cursor movement.; Indirect Methods. Signals extracted by EMG will modulate the feedback offered to the learner to penalize deviations from desired muscle patterns. When multiple ways to perform a movement are offered by redundancy, (i.e., by the multiplicity of muscles compared to task demands), the brain chooses solutions that minimize noise and uncertainty.
Experimental: STROKE	Device: Motion and Emg Control; We will consider two methods for integrating motions and EMG signals: Direct methods. Signals extracted from the latent EMG space will directly contribute to the control of the external device. We will integrate EMG and IMU in two ways. In a first scenario, EMG and IMU will be given variable weight in the control. In a second scenario (perturbative method) the distance of ongoing muscle patterns from a desired set of strategies will modulate the mapping from body to cursor motions in the form of assistive (i.e. the cursor moves faster towards the target) or resistive (i.e. the cursor slows down) influences on cursor movement.; Indirect Methods. Signals extracted by EMG will modulate the feedback offered to the learner to penalize deviations from desired muscle patterns. When multiple ways to perform a movement are offered by redundancy, (i.e., by the multiplicity of muscles compared to task demands), the brain chooses solutions that minimize noise and uncertainty.
Experimental: UNIMPAIRED	Device: Motion and Emg Control; We will consider two methods for integrating motions and EMG signals: Direct methods. Signals extracted from the latent EMG space will directly contribute to the control of the external device. We will integrate EMG and IMU in two ways. In a first scenario, EMG and IMU will be given variable weight in the control. In a second scenario (perturbative method) the distance of ongoing muscle patterns from a desired set of strategies will modulate the mapping from body to cursor motions in the form of assistive (i.e. the cursor moves faster towards the target) or resistive (i.e. the cursor slows down) influences on cursor movement.; Indirect Methods. Signals extracted by EMG will modulate the feedback offered to the learner to penalize deviations from desired muscle patterns. When multiple ways to perform a movement are offered by redundancy, (i.e., by the multiplicity of muscles compared to task demands), the brain chooses solutions that minimize noise and uncertainty.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time	Changing time to task completion	during the intervention

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Muscle activity	EMG activity in targeted muscles	baseline, during the procedure, at 1 week follow-up
Cortico spinal connectivity	Motor evoked potentials in selected muscles following TMS stimulation of M1	baseline, immediately after the intervention, at 1 week follow-up

Collaborators and Investigators

• Sponsor: Shirley Ryan AbilityLab
• Collaborators: National Institute on Disability, Independent Living, and Rehabilitation Research
• Investigators: Principal Investigator: Ferdinando Mussa-Ivaldi, PhD, Northwestern University

Study record dates

Study Major Dates

• Study Start (Actual): January 20, 2020
• Primary Completion (Anticipated): August 1, 2024
• Study Completion (Anticipated): August 1, 2024

Study Registration Dates

• First Submitted: August 21, 2020
• First Submitted That Met QC Criteria: November 17, 2020
• First Posted (Actual): November 24, 2020

Study Record Updates

• Last Update Posted (Actual): November 24, 2020
• Last Update Submitted That Met QC Criteria: November 17, 2020
• Last Verified: November 1, 2020

More Information

Terms related to this study

• Keywords: TMS; Motor Learning; Neurorehabilitation; Human Machine Interface; Cortico-spinal; Upper-body movements
• Additional Relevant MeSH Terms: Central Nervous System Diseases; Nervous System Diseases; Wounds and Injuries; Trauma, Nervous System; Spinal Cord Diseases; Spinal Cord Injuries
• Other Study ID Numbers: STU00210086

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No