Depression of an Inhibitory Reflex, the Masseteric Silent Period, in Recovering Alcoholics
| Autor: | Judith Ann Hirsch, Richard B. Cowan, Beverly Bishop, James L. York, Cynthia E. Vernon |
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| Rok vydání: | 1995 |
| Předmět: |
Adult
Male Reflex Stretch Medicine (miscellaneous) Electromyography Toxicology Masseter muscle Isometric Contraction Reaction Time medicine Humans Motor Neurons medicine.diagnostic_test Masseter Muscle Neural Inhibition Anatomy Middle Aged Alcoholism Psychiatry and Mental health Electrophysiology Trigeminal motor nucleus medicine.anatomical_structure Anesthesia Reflex Female Silent period Psychomotor disorder Psychology Jaw jerk reflex |
| Zdroj: | Alcoholism: Clinical and Experimental Research. 19:527-532 |
| ISSN: | 1530-0277 0145-6008 |
| DOI: | 10.1111/j.1530-0277.1995.tb01542.x |
| Popis: | Because inhibitory deficits may contribute to motor incoordination of alcoholics, we proposed that the duration of the masseteric silent period (SP), an inhibitory reflex, might be shorter in alcoholics (ALs) than in nonalcoholics (NAs). To test this hypothesis, we measured the SP in a racially mixed group of 12 ALs and 12 NAs matched for age (31-49 years) and sex. All subjects were normotensive, had full dentition, and reported no major medical problems. Sensory and motor conduction velocities of the anterior tibialis, ulnar, and medial nerves were measured for each subject, and were not different in ALs and NAs. Jaw jerk and SP were evoked by tapping the chin manually with a rubber hammer containing a circuit to trigger the oscilloscope display of the masseter EMGs. Averaged mean latencies and durations of the SPs were not significantly different between the right and left masseters. SP latencies were significantly (0.7 msec) shorter in ALs than NAs (p < 0.01). The mean SP duration for ALs (13.9 +/- 1.6 msec) was also significantly shorter than that of the NAs (24.4 +/- 2.4 msec; p < 0.001). Results support the hypothesis that chronic alcoholism may interfere with inhibitory mechanisms in the CNS. |
| Databáze: | OpenAIRE |
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