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Differences in Chewing Behavior during Mastication of Foods with Different Textures.

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Chewing Japanese staple foods like rice and rice cake activates jaw muscles differently. Rice cake requires more forceful chewing initially compared to rice, impacting muscle activity patterns during mastication.

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Area of Science:

  • Oral physiology
  • Biomechanics of mastication
  • Food science

Background:

  • Chewing is a complex process involving muscle coordination to break down food.
  • The physical properties of food significantly influence masticatory muscle activity and chewing patterns.
  • Understanding how different food textures affect chewing is crucial for oral health and nutrition.

Purpose of the Study:

  • To investigate the influence of Japanese staple foods (rice and rice cake) with varying physical properties on masticatory muscle activity.
  • To compare the electromyographic patterns of the masseter and suprahyoid muscles during the consumption of rice versus rice cake.
  • To elucidate how the masticatory sequence adapts to the initial physical characteristics of different foods.

Main Methods:

  • Six healthy adults participated in the study.
  • Surface electromyography (EMG) was used to record activity in the masseter and suprahyoid muscles.
  • Participants freely chewed standard Japanese rice and rice cake in a natural manner.

Main Results:

  • Significant differences in masticatory duration were observed between rice and rice cake.
  • Masseter muscle activity per chewing cycle was notably higher for rice cake compared to rice.
  • Masseter muscle activity decreased progressively during rice cake chewing, while suprahyoid muscle activity remained constant.

Conclusions:

  • The bolus formation process differs substantially between rice and rice cake, reflected in distinct jaw-closing and jaw-opening muscle activities.
  • Masticatory sequences adapt to variations in food's initial physical properties.
  • This research provides insights into oral physiology, bolus formation, and the impact of food texture on chewing mechanics.