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Variation in Daily Masticatory Muscle Activity in the Rabbit

Department of Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA), Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands;

^* corresponding author, g.e.langenbach{at}amc.uva.nl

The daily use of masticatory muscles remains largely unclear, since continuous recordings were limited in space and time. This study’s purpose was to use radio-telemetry to examine daily muscle use and its inter- and intra-individual variations. A telemetric device was implanted into the rabbit masseter, and the transmitted signals were digitally stored for 7 days. Muscle use was analyzed by calculation of the total time each muscle was activated above 5, 20, and 50% of the day’s peak activity. Rabbits (n = 6) spent only 2% of the time chewing. Muscles were activated up to 20% of the total time at levels exceeding 5% of peak activity, and only about 0.5% of the time in forceful behaviors utilizing 50% of maximum contraction. It can be concluded that daily muscle use remained constant during succeeding days, but differed significantly among muscle regions and individuals.

KEY WORDS: masseter • EMG • duty time • telemetry

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