Electromyographic responses from the stimulation of the temporalis muscle through facial acupuncture points
Received 12 June 2007; received in revised form 17 August 2007; accepted 28 August 2007.
Abstract
Objective
This study measured the electromyographic (EMG) responses of the temporalis muscle to electrical stimulation at 10 acupuncture points (acupoints) of the face and assessed whether electrical stimulation of these acupoints may improve the rhythmic activity of the muscles that open and close the jaw.
Methods
Fifty healthy adults clenched 2 thin pieces of wood between their teeth and kept a constant bite force for 30 seconds. The left anterior temporalis muscle was chosen for spontaneous EMG stimulation and recording.
Results
The mean EMG responses were positive at 10 points in early reflexes but negative at points Jiache, Chengjiang, and Dicang for late reflexes. No statistically significant difference was observed in the responses between age and stimulation intensity for both areas, but a significant inverse correlation existed between the distance from the acupoint to the recording electrode and the response.
Conclusion
This study showed that the surface electrical current applied to facial skin acupoints may excite or inhibit the anterior temporalis muscle via reflex pathways. The result from this stimulation may be applied to treat temporomandibular joint disorder occlusion of muscular origin.
aProfessor, State Key Laboratory of Oral Diseases, West China of Stomatology College, Sichuan University, Chengdu 610041, People's Republic of China
bResearch Assistant, Faculty of Dentistry, The University of Hong Kong, Hong Kong
cStudent, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada
Corresponding author. State Key Laboratory for Oral Diseases, West China of Stomatology College, Sichuan University, Renmingnanlu 3rd part 14#, Chengdu, People's Republic of China. Tel.: +86 28 61153338; fax: +852 31767247.
ABSTRACT