Control of Jaw-Clenching Forces in Dentate Subjects.

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      ITALY
    • Abstract:
      Aims: To characterize the control of jaw-clenching forces by meansof a simple force-matching exercise. Methods: Seventeen healthysubjects, provided with visual feedback of the exerted force, carriedout a unilateral force-matching exercise requiring developing andmaintaining for 7 seconds a jaw-clenching force at 10%, 30%, 50%,and 70% of the maximum voluntary contraction. The task was repeatedthree times in each of two sessions. Motor performance wasassessed, for both left and right sides, by different indices quantifyingmean distance (MD), offset error (OE), and standard deviation(SD). Their dependence on force intensity, side, and time wasassessed by ANOVA. Results: All error indices increased with theintensity of contraction in absolute terms. After normalization withrespect to force level, the average performance in the second sessionwas characterized by MD of 8.1% ± 2.6, OE 4.8% ± 2.9, and SD12.7% ± 6.7 (mean ± standard deviation). Assessment of performanceexhibited good reliability for all indices (intraclass correlationcoefficient ranging from 74% to 88%). The motor performanceimproved with repetition (P < .01), varied considerably between subjects,was not correlated with gender or age (P > .05) but was highlycorrelated between left and right side (P < .01). Conclusion: Theadopted approach is adequate to provide for an objective assessmentof individual force control, although the presence of a learningphase must be taken into account. [ABSTRACT FROM AUTHOR]
    • Abstract:
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