Daily jaw muscle activity in freely moving rats measured with radio-telemetry
Daily jaw muscle activity in freely moving rats measured with radio-telemetry
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DOI：
10.1111/j.1600-0722.2007.00424.x
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发表时间：
2007-02-01
影响因子：
1.9
通讯作者：
Tanne, Kazuo
中科院分区：
文献类型：
--
作者：
Kawai, Nobuhiko;Tanaka, Eiji;Tanne, Kazuo
已经针对特定任务研究了大鼠的下颌肌肉活动。然而，日常下颌肌肉的使用情况仍不清楚。本研究的目的是通过使用无线电遥测技术检查大鼠 (n = 12) 的日常下颌肌肉活动及其随时间的变化。植入遥测装置以连续记录咬肌和二腹肌活动。通过计算每块肌肉活跃的总时间（工作时间）、爆发次数和平均爆发长度来表征每日肌肉使用情况。所有参数均针对超过当天峰值活动的不同水平（5-90%）的活动进行估计。每日肌肉使用量持续 4 周保持恒定。在低活动水平下，二腹肌的工作时间和爆发次数显着高于咬肌（P < 0.01），而在高活动水平下则相反（P < 0.05）。咬肌和二腹肌的爆发次数之间没有观察到显着的肌肉间相关性，但是两种肌肉的个体间差异都发生了变化，具体取决于激活水平。这些发现表明，咬肌和二腹肌根据活动水平表现出不同的活动模式。
The jaw muscle activity of rats has been investigated for specific tasks. However, the daily jaw muscle use remains unclear. The purpose of the present study was to examine daily jaw muscle activity, and its variability over time, in the rat (n = 12) by the use of radio-telemetry. A telemetric device was implanted for the continuous recording of masseter muscle and digastric muscle activity. Daily muscle use was characterized by calculating the total time that each muscle was active ( duty time), the number of bursts, and the average length of bursts. All parameters were estimated for activities exceeding various levels (5-90%) of the day's peak activity. Daily muscle use remained constant for 4 wk. At the low-activity level, the duty time and burst number of the digastric muscle were significantly (P < 0.01) higher than those of the masseter muscle, whereas the opposite was true at the high-activity level (P < 0.05). No significant intermuscular correlation was observed between the number of bursts of the masseter and digastric muscles, but the interindividual variation of both muscles changed, depending on the level of activation. These findings suggest that the masseter muscle and the digastric muscle show a differential active pattern, depending on the activity level.