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A Controlled Daytime Challenge of Motor Performance and Vigilance in Sleep Bruxers

M. Major

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

P.H. Rompre

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

F. Guitard

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

L. Tenbokum

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

K. O'Connor

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

T. Nielsen

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

G.J. Lavigne

Facultes de medecine dentaire et de medecine, Departement de sante buccale, Universite de Montreal, C.P. 6128, succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3J7, Centre de recherche Fernand-Seguin, Montreal, Canada

Many etiological factors have been suggested for sleep bruxism. Among these, elevated mental and physical alertness has been proposed to characterize sleep bruxers. The present study tests the hypothesis that, during the daytime, sleep bruxers are more vigilant and more prone to react to a motor command than are control subjects. Seven sleep bruxers, diagnosed polysomnographically according to validated research criteria, were matched for age and gender to seven control subjects. A simple reaction time task was selected to assess daytime vigilance and motor responsiveness. The following physiological measures were recorded: reaction time, error rate, electroencephalography, electrocardiography, electromyography, and video detection of body movements. Analysis of these variables showed no differences between groups. During the test, bruxers and controls showed a parallel decrease in EEG vigilance and heart rate over time. Frequency of orofacial and body movements was the same in both groups, and no clenching activity was observed during the experimental test. Subjects' visual analog scale ratings revealed that both controls and bruxers were more competitive after the test than before, and bruxers were slightly more anxious than controls before and after the test. Together, the results indicate that sleep bruxers are neither more vigilant nor more prone to react to a motor command during the daytime than are control subjects.

Key Words: sleep bruxism • reaction time • vigilance, • EEG • orofacial EMG • heart rate

Journal of Dental Research, Vol. 78, No. 11, 1754-1762 (1999)
DOI: 10.1177/00220345990780111301
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G.J. Lavigne, T. Kato, A. Kolta, and B.J. Sessle
NEUROBIOLOGICAL MECHANISMS INVOLVED IN SLEEP BRUXISM
Critical Reviews in Oral Biology & Medicine, January 1, 2003; 14(1): 30 - 46.
[Abstract] [Full Text] [PDF]