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Electromyographic insertional activity mechanically provoked in the biceps brachii
Archives of Physical Medicine and Rehabilitation
|December 1, 1977
Summary
Needle insertion creates electrical activity in muscles. This study quantifies this insertional activity in normal subjects, finding sharp spike activity persists for approximately 48 milliseconds after needle removal.
Area of Science:
- Neurology
- Biomedical Engineering
Background:
- Electromyography (EMG) studies muscle and nerve electrical activity.
- Prolonged insertional activity (IA) is observed in certain neuromuscular disorders.
- Quantitative data on IA in healthy individuals is lacking.
Purpose of the Study:
- To quantitatively evaluate insertional activity in normal subjects.
- To establish a baseline for IA in healthy muscle.
- To understand the duration of electrical signals post-needle insertion.
Main Methods:
- Development and utilization of a mechanical electrode inserter.
- Recording and analysis of insertional activity in 20 healthy volunteers.
- Focus on sharp spike activity during EMG.
Main Results:
- Sharp spike activity, a component of IA, was measured.
- This activity persisted for an average of 48 +/- 18 milliseconds after electrode movement ceased.
- Data collected from the biceps brachii muscle.
Conclusions:
- Provides quantitative data on normal insertional activity.
- Establishes a normative value for sharp spike duration in healthy muscle.
- Offers a baseline for comparison in clinical electromyography.