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Energy metabolic events on skeletal muscle fatigue have been reported using31P magnetic resonance spectroscopy (31P-MRS). In this study the degree of rat masticatory movements during feeding was determined by the signal intensity of a force transducer. The biting force of anesthetized rat caused by electrical stimulation was measured with a original biting force meter, and also the changes of levels of phosphocreatine (PCr), inorganic phosphate (Pi) and intracellular pH (pHi) in the masseter muscle during masticatory movements were observed using in vivo31P MRS.The results obtained were as follows:1. There was a linear relationship between the biting force and the signal intensity in a biting force range of 0 to 90g. The highest frequencies of occurrence in masticatory force and cycle during feeding were 40g and 5Hz respectively, and the maximum masticatory time was 32min.2. 31P-MRS measurements were carried under the conditions of the electrical stimulation for 32min and the various masticatory forces-cycles. PCr/Pi ratios during the stimulation increased significantly under the conditions of 40g -7Hz, 90g -3, 5, 7Hzs, and pHi value during the stimulation changed significantly under the condition of 90g -7Hz. Both of them recovered after the stimulation.These findings may suggest that the energy metabolism in the rat masseter muscle contraction is performed mainly under aerobic circumstance, and relate to masticatory force and cycle.

Energy Metabolism of the Rat Masseter Muscle on Masticatory Movements.