Date of Award

Spring 1988

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Biomedical Engineering

First Advisor

Jeutter, Dean C.

Second Advisor

Ackmann, James J.

Third Advisor

Hoge, Henry W.


The electromyhograms from the human masseter muscles of a randomly sampled population were obtained. For each of the 19 volunteers, four data records were taken during four different mechanical activities: a 20 mm bite separation sequence, a 2 mm bite separation sequence, a clenching sequence, and a chewing sequence. A low noise, low power, wide bandwidth, variable gain EMG preamplifier/signal conditioner was designed and constructed to sense and amplify the signals. The amplified signals were sampled at 2 KHz via a PDP 11/23 computer system and stored as 4.096 second time records on diskettes. The data was transferred to a VAX 11/780 computer and analyzed with custom designed FORTRAN routines. The quantities estimated for each record of each subject were the RMS signal strength, the maximum signal strength, the power spectral density, the mean power frequency, and the spectral deviation. Equivalence tests were run on the spectra for each activity type and equivalent spectra were pooled. It was found that the spectra for clenching and chewing activities of the dysfunctional persons in the test group were measurably different from the average statistics of the group.



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