Chronaxie
Chronaxie
Chronaxie (pronounced: kroh-nak-see) is a term used in neurophysiology to describe the minimum time that an electric current double the strength of the rheobase is required to stimulate a muscle or nerve cell.
Etymology
The term 'Chronaxie' is derived from the Greek words 'Chronos' meaning time, and 'Axia' meaning value. It was first used in the field of neurophysiology by Louis Lapicque in the early 20th century.
Definition
Chronaxie is a measure of the excitability of a nerve or muscle cell. It is defined as the minimum time required for a cell to respond to an electrical stimulus that is twice the strength of the rheobase. The rheobase is the minimum current amplitude of infinite duration that will excite a cell.
Importance
Chronaxie values are important in the field of electrotherapy and biomedical engineering. They are used to determine the optimal parameters for electrical stimulation of nerves and muscles. Lower chronaxie values indicate a higher excitability of the cell.
Related Terms
- Rheobase: The minimum current amplitude of infinite duration that will excite a cell.
- Strength-duration curve: A graph that plots the strength of an electrical stimulus against the duration required to stimulate a cell.
- Electrotherapy: The use of electrical energy as a medical treatment.
- Biomedical engineering: The application of engineering principles and design concepts to medicine and biology for healthcare purposes.
External links
- Medical encyclopedia article on Chronaxie
- Wikipedia's article - Chronaxie
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