Effect of Repeated Food Morsel Splitting on Jaw Muscle Control

Publikation: KonferencebidragPosterForskningpeer review

  • Kumar A, Danmark
  • Krister G Svensson, Karolinska Institutet, Huddinge, Sverige
  • Lene Baad-Hansen
  • Flemming Isidor, Danmark
  • Mats Trulsson, Karolinska Institutet, Huddinge, Sverige
  • Peter Svensson
Mastication is a complex motor task often initiated by splitting of the food morsel between the anterior teeth. Training of complex motor tasks has consistently been shown to trigger neuroplastic changes in corticomotor control and optimization of muscle function. It is not known if training and repeated food morsel splitting lead to changes in jaw muscle function. Objective: To investigate if repeated splitting of food morsels in participants with natural dentition changes the force and jaw muscle electromyographic (EMG) activity. Methods: Twenty healthy volunteers (mean age = 26.2 ± 3.9 years) participated in a single one-hour session divided into six series. Each series consisted of ten trials of a standardized behavioral task (total of 60 trials). The behavioral task was to hold and split a food morsel (8 mm, 180 mg placebo tablet) placed on a bite force transducer with the anterior teeth. The hold and split forces along with the EMG activity of left and right masseter (MAL and MAR), left anterior temporalis (TAL) and digastric (DIG) muscles were recorded. Results: The mean hold force (P<0.001) but not the mean split force (P=0.590) was significantly influenced by the number of completed series. The variability of the hold and split forces did not show any effect of series (P>0.119). The mean EMG values were not significantly influenced by series except for variability of EMG for MAL during the hold phase (P=0.021) and DIG during the split phase (P<0.001). Conclusion: There was no evident optimization of jaw motor function in terms of reduction in the variability of bite force values and muscle activity, when this simple task was repeated up to sixty times, in participants with normal intact periodontium.
StatusUdgivet - 2014

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