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Masticatory biomechanics and masseter fiber-type plasticity
M J Ravosa1, J Ning, D B Costley
1Department of Pathology and Anatomical Sciences, University of Missouri School of Medicine, Columbia, MO 65212, USA. ravosam@missouri.edu
Journal of Musculoskeletal & Neuronal Interactions
|March 2, 2010
Summary
Dietary changes in young rabbits significantly alter jaw muscle fiber types. Tougher diets lead to larger muscle fibers and more Type II fibers, impacting feeding mechanics.
Area of Science:
- Developmental biology
- Muscle physiology
- Craniofacial biology
Background:
- Jaw muscle plasticity is understudied compared to skeletal elements.
- Understanding muscle's role in craniofacial development is crucial.
Purpose of the Study:
- Investigate masseter muscle fiber-type abundance and cross-sectional area in rabbits.
- Examine the impact of diet-induced masticatory stress on jaw muscle plasticity.
Main Methods:
- Rabbits were raised on different diets from weaning to adulthood.
- Masseter muscles were dissected and analyzed for fiber types (immunohistochemistry).
- Muscle data were correlated with mandibular proportions and biomineralization.
Main Results:
- Tougher diets resulted in fewer Type I fibers and more Type II fibers.
- Muscle fibers showed larger cross-sectional areas in rabbits on tougher diets.
- Dietary shifts induced significant variations in muscle fiber composition.
Conclusions:
- Early postweaning diet influences jaw muscle fiber types and size.
- These muscle adaptations are comparable to skeletal responses to diet.
- Dietary-induced changes enhance jaw adductor force production and contraction speed.
