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Variation in Daily Masticatory Muscle Activity in the Rabbit
G.E.J. Langenbach*,
T. van Wessel,
P. Brugman and
T.M.G.J. van Eijden
Department of Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA), Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands;
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Figure 1. Method of data collection and analysis. Bottom left: lateral view of the rabbit masticatory system. Indicated are the 2 electrode locations in the masseter. Implantation site (F50-EEEE, 45 x 17 x 10 mm, 14 g) in the neck area, the cordless transmission of data to the receiver, and storage of data on a personal computer with the DataQuest ART acquisition software. Right column: reduction of the daily amount of samples by distribution in 1500 EMG categories (0–1.5 mV).
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Figure 2. Rectified EMG recording of the superficial masseter. (a) Five min of recording, showing different behaviors. Indicated are the positions of the 20-second amplifications shown in b, c, and d. (b) Chewing behavior. (c) Silence period, with some small activity bursts. (d) Some grooming behavior. Scale of the vertical axes (0–100%) is identical in all plots. Broken lines indicate 5 and 50% of the peak activity (100%). Note that the distribution as shown in this Fig. is not typical for the total activity scheme during the entire day.
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Figure 3. The duty times of the masseter of animal #5. (A) The hourly 5% duty time of the superficial masseter during the third (thick line) and fourth (thin line) experimental days. The bar above the curves indicates the day (open) and night (solid) periods. The 5% (B), 20% (C), and 50% duty times (D) for the superficial (open) and deep (solid) masseter regions as recorded during all experimental days. Note that, at all activity levels and for the entire experimental period (7 days), the deep masseter region was more active than the superficial muscle.
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Figure 4. The duty times of the masseters of all experimental animals. The (over all experimental days; n = 7) averaged 5% (A), 20% (B), and 50% duty times (C) for the superficial (open) and deep (solid) masseter regions as recorded for all 6 animals. Standard deviations are shown above the bars. Significant differences between muscle regions are indicated by single (p < 0.05) or double asterisks (p < 0.01).
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Journal of Dental Research, Vol. 83, No. 1,
55-59 (2004)
DOI: 10.1177/154405910408300111
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