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Neck Motor Unit Activities Induced by Inputs from Periodontal Mechanoreceptors in Rats

¹ Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Science and
² Section of Cognitive Neurobiology, Department of Maxillofacial Biology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; and
³ Department of Physiology, Nagasaki University School of Dentistry, Nagasaki 852-8588, Japan;

View larger version (21K): [in this window] [in a new window]   Figure 1. A typical reflex response from the splenius muscle. Tonic discharges are observed under steady, moderate-intensity, unilateral pressure stimulation of the periodontal mechanoreceptors. Motor unit activity under (A) ipsi- and (B) contralateral periodontal stimulation. The threshold was 435.7 mN for the ipsi- and 410.4 mN for the contralateral side (indicated by horizontal arrows). Peak instant spike frequencies were 28 Hz and 36 Hz for the ipsi- and contralateral sides, respectively.

View larger version (12K): [in this window] [in a new window]   Figure 2. Differences between threshold values for ipsi- and contralateral sides (± SEM). Data from 16 motor units combined, ipsilateral n = 39 trials, contralateral n = 43 trials. Threshold value was determined during the ramp-phase of stimulation when the first spike was obtained. **p < 0.001 in the Mann-Whitney U test.

View larger version (17K): [in this window] [in a new window]   Figure 3. Mean spike frequencies for 3 different levels of stimulation, ipsi- and contralateral sides (± SEM). One hundred thirty-two responses were recorded from 16 motor units. Ipsilateral side — weak n = 15, moderate n = 27, strong n = 20; contralateral side — weak n = 27, moderate n = 23, strong n = 20. *Statistical significance, ANOVA post hoc test (Fisher PLSD, 5% significance level).

Journal of Dental Research, Vol. 81, No. 1, 39-42 (2002)
DOI: 10.1177/154405910208100109


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