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Abstract

The amplitude of the jaw jerk action potential (MSP) is a parameter with possible diagnostic value. Standard values have, however, not yet been established. MSPs were recorded using surface EMG electrodes in the masseter and the anterior temporal muscles of young and elderly healthy males and females. The group means ranged from 0.26 to 2.11 mV in the masseter and from 0.17 to 0.81 mV in the anterior temporalis. The amplitude of MSP was higher in females than in males, decreased in elderly subjects and lower in the temporalis than in the masseter. The jaw jerk action potentials also were recorded in four subjects before and after L-Dopa administration. The amplitude increased by about 90%. It is concluded that the parameter MSP amplitude can be useful in the studies of muscle spindle sensitivity and the influence of various physiological, pathophysiological and pharmacological factors on the nervous regulation and muscle function in the masticatory system.

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References

Widmalm, S.E. : Reflex Activity of the Masseter Muscle in Man. An EMG Study, Acta Odont Scand 34:Suppl 72, 1976.

Munro, R.R. ; and Griffin, C.J. : Electromyography of the jaw jerk recorded from the masseter and anterior temporalis muscles in man, Arch Oral Biol, 16:59-69, 1971.

Sica, R.E.P. ; Aguilera, N. ; and Her-Skovits , E. : Impaired potentiation of H-reflexes in patients with Parkinson's disease, Medicina , 32:588-595, 1972.

Widmalm, S-E. ; Gill, H. ; and Widmalm, S. : Trend analysis of jaw jerk action potential-amplitude data, J Dent Res 58:4, 1979.

Brownlee, K.A. : Statistical Theory and Methodology in Science and Engineering, 2nd edn., John Wiley and Sons, New York, 1965.

Siegel, S. : Nonparametric Statistics for the Behavioral Sciences, McGraw-Hill, New York, pp. 47-52, 1956.

Phillips, Susan J. ; Richens, A. ; and Shand, D.G. : Adrenergic control of tendon jerk reflexes in man, Br J Pharmacol, 47: 595-605, 1973.

Carlson, K.E. : Electromyographic study of aging in skeletal muscle, Am J Phys Med, 43:141-145,1964.

Goodwill, C.J. : The normal jaw reflex: Measurement of the action potential in the masseter muscle, Ann Phys Med, 9:183-188, 1968.

10.

Bratzlavsky, M. ; DE Boever, J. ; and Van Der Eecken, H. : Tooth pulpal reflexes in jaw musculature in man, Arch Oral Biol, 21 :491-493, 1976.

11.

Rushworth, G. : Spasticity and rigidity: An experimental study and review, J Neurol Neurosurg Psychiatry 23:99-117, 1960.

12.

Dietrichson, P. : The fusimotor system in relation to spasticity and Parkinsonian rigidity, Scand J Rehabil Med, 5:174-178, 1973.

13.

Matthews, P.B.C. : Mammalian Muscle Receptors and Their Central Actions, Edward Arnold (Publishers), Ltd., London, 1972.

14.

Rodriquez, A.A. ; and Oester, Y.T. : Fundamentals of electromyography, in: Electrodiagnosis and Electromyography , ed. by S. Licht , Elizabeth Licht, Publisher, New Haven, Connecticut , 3rd edn., pp. 297-351, 1971.

Standard Values of the Amplitude of Jaw Jerk Action Potential and Differences Due to Age,Sex and L-Dopa Treatment

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