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Re-evaluation of EMG-torque relation in chronic stroke using linear electrode array EMG recordings.
Minal Bhadane1,2, Jie Liu3, W Zev Rymer3
1Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center - Houston, Houston, TX, USA.
Scientific Reports
|June 29, 2016
Summary
This study re-evaluated electromyography-torque relations in stroke survivors, finding peripheral adaptive changes play a key role. Electrode placement significantly impacts results, highlighting its importance in research and clinical practice.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Controversial reports exist regarding electromyography (EMG)-torque relationships between impaired and non-impaired limbs in individuals with chronic stroke.
- Understanding these relationships is crucial for effective rehabilitation strategies.
Purpose of the Study:
- To re-evaluate the EMG-torque relation in chronic stroke survivors using linear electrode array EMG recordings.
- To investigate the influence of electrode placement and peripheral adaptive changes on EMG-torque relationships.
Main Methods:
- Ten subjects with chronic stroke performed isometric elbow flexion tasks.
- Surface EMG of biceps brachii muscles was recorded using a 20-channel linear array on both impaired and non-impaired sides.
- M-wave recordings were also performed, and the slope of EMG-torque relations was analyzed, minimizing effects of electrode placement and innervation zone asymmetry.
Main Results:
- The distribution of the EMG-torque slope followed a quasi-symmetrical "M" shape, with the lowest value at the innervation zone.
- The slope was greater on the impaired side in 4 out of 10 subjects.
- A moderate to high correlation was found between the slope ratio and the M-wave ratio between the two sides.
Conclusions:
- EMG-torque relations in chronic stroke are influenced by multiple factors, including peripheral adaptive changes.
- Precise electrode placement is critical for accurate EMG-torque assessments.
- Peripheral adaptive changes appear to play a primary role in modulating EMG-torque relationships post-stroke.
