Antagonist Activation Measurement at the Ankle Using High-density and Bipolar Surface EMG in Chronic Hemiparesis

Stroke Clinical Trial

— CC2017  

Official title:

Antagonist Activation Measurement at the Ankle Using High-density and Bipolar Surface EMG in Chronic Hemiparesis

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT06099132
• Other study ID #: CC2017
• Status: Completed
• Start date: January 1, 2017
• Est. completion date: December 31, 2017

Study information

• Verified date: October 2023
• Source: Henri Mondor University Hospital
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

In chronic hemiparesis, abnormal antagonist muscle activation in the paretic lower limb contributes to impair ambulation capacities. A biased estimate of antagonist muscle activation when using surface bipolar EMG compared with high-density (HD) EMG has been previously reported in healthy subjects. The present study compares muscles cocontraction at the paretic ankle estimated with a pair of and multi-channel surface EMG.

Description:

In chronic hemiparesis, gait velocity deficit is associated with a disturbed voluntary movement caused especially by inappropriate antagonist muscle activation. The present study investigates muscles cocontraction at the paretic ankle estimated with a pair of and multi-channel surface EMG (HD-EMG) in patients after stroke. HD-EMGs were collected from gastrocnemius medialis (GM), tibialis anterior (TA) and soleus (SO) during isometric contractions. From these EMGs the study asked whether bipolar and HD-EMGs provided comparable estimates of antagonist activation. Two active contraction levels (submaximal vs. maximal) and knee positions (flexed vs. extended) were assessed for each muscle. Notwithstanding the evidence of localized antagonist activation in the GM muscle of healthy subjects, hypothesizing equally localized antagonist activation in the paretic limb may not follow from the current literature. In virtue of evidence supporting the enlargement of motor unit territories in paretic and hyperactive muscles, it may be that stroke survivors have lost their ability to regionally and appropriately activate their muscle. In this case, bipolar and HD-EMG would be expected to provide comparable antagonist activation coefficients.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 12
• Est. completion date: December 31, 2017
• Est. primary completion date: December 31, 2017
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• hemiparesis due to a non-evolutive central nervous system lesion
• time since lesion = 6 months
• ability to walk 10 meters barefoot without any assistance
• cognitive abilities to understand the verbal instructions for the test according to the investigator's judgment
• absence of botulinum toxin injections within the last 3 months prior to enrolment

Exclusion Criteria:

• botulinum toxin injections within the last 3 months prior to enrolment

Related Conditions & MeSH terms

• Muscle Hypertonia
• Muscle Spasticity
• Paresis
• Spasticity, Muscle
• Stroke

Intervention

Diagnostic Test:
• Electromyographic measurements
HD and bipolar EMG were assessed from gastrocnemius medialis (GM), soleus (SO) and tibialis anterior (TA) at seated position, ankle at 0°, during isometric submaximal effort and maximal effort, knee flexed (90°) and knee extended (0°)

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
Henri Mondor University Hospital

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Coefficient of ANtagonist activation	The Coefficient of ANtagonist activation of 3 muscles was calculated by the ratio between the root mean square amplitude during antagonist effort and maximal agonist effort for the same muscle.	5 seconds