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Duty Time of Rabbit Jaw Muscles Varies with the Number of Activity Bursts

T. Grünheid1,*, G.E.J. Langenbach2, A. Zentner1, and T.M.G.J. Van Eijden2

1 Department of Orthodontics and
2 Department of Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Louwesweg 1, 1066 EA Amsterdam, The Netherlands


Figure 1
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  		Figure 1. Example of an EMG recording and details for quantification of individual bursts. (A) Segment of a processed and rectified EMG recorded from the posterior deep masseter of animal #4 during normal daily oral behavior. (B) Expanded view at the location of the arrow shown in (A). The broken lines indicate activity levels, expressed as percentages of the maximum activity (peak-EMG) of this muscle for that day. EMG activity was based on the number and lengths of bursts with amplitudes exceeding 2%, 5%, 10%, 20%, 50%, and 90% of the peak-EMG. We grouped bursts to determine the duty times at these activity levels. Note that the depicted period is not representative of the EMG recording for the entire day.

 

Figure 2
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  		Figure 2. Correlated EMG activity of the examined jaw muscles. The scatter plots illustrate the relationships among the variables burst number, mean burst length, and duty time at the activity level exceeding 5% of the peak-EMG. Panels consist of data obtained during continuous EMG recording for 24 hrs, with each datapoint representing 1 hr. Data from all animals are presented in the same graph to facilitate comparison. r = Partial correlation of the variables displayed in the panel, adjusted for the remaining variable (averaged over all samples; number of samples is shown below muscle name).

 




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