Mechanical properties of masticatory muscle in bite opening-treated guinea pigs.
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Isometric tension responses to various levels of Ca<SUP>2+</SUP> activations at a muscle length Lo (just taut) and transient tension responses to rapid length stretches (less than 0.6% of Lo within 2 ms) at maximal Ca<SUP>2+</SUP> activation levels were measured in the glycerinated masseter, the temporalis and the digastric muscles (2.5-4.0 mm long, 100-200μm in diameter) from control and bite opening-treated of 1, 2 and 8 weeks old guinea pigs. Steady isometric tension of control preparations increased in a sigmoid fashion as Ca<SUP>2+</SUP> varied from about pCa 6.60 to 5.82 in each of the three different muscles. However, following bite opening treatment the Ca<SUP>2+</SUP>-tension relationship was increased with Ca<SUP>2+</SUP>-sensitivity in the masseter and decreased with Ca<SUP>2+</SUP> -sensitivity in the temporalis, but not in the digastric muscle. The maximum tension increased in the masseter, but decreased temporarily and then increased gradually toward the control levels both in the temporalis and the digastric of the bite opening treated groups. The duration of the transient tension response in the masseter was lengthened significantly after 1 week of bite opening, then it was shortened after a longer period of bite opening. In contrast, the duration of the transient tension response in the temporalis and the digastric muscles was shortened by the bite opening. These results suggest that the Ca<SUP>2+</SUP>-sensitivity and the cross-bridge kinetics in the masticatory muscles would be changed by bite opening treatment.
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