Control of elevator muscle activity during simulated chewing with varying food resistance in humans.
Control of elevator muscle activity during simulated chewing with varying food resistance in humans.
复制标题
在模拟人类不同食物阻力的咀嚼过程中控制电梯肌肉活动。
DOI：
10.1152/jn.1992.68.3.933
复制
发表时间：
1992
影响因子：
2.5
通讯作者：
F. Bosman
中科院分区：
文献类型：
--
作者：
F. Ottenhoff;A. Bilt;H. Glas;F. Bosman
1.在咀嚼期间，下颌骨的基本开合运动需要观察到的肌肉活动的一小部分，并且需要更多的额外肌肉活动（AMA）来克服食物的阻力。在咀嚼周期中，其中的反作用力是预期的，AMA主要是由外周诱导产生的潜伏期约为23毫秒。它进行了调查是否开环或闭环机制参与控制的AMA在这些周期。2.受试者在节拍器的控制下以自然的咀嚼频率进行有节奏的开合运动。食物阻力模拟的外力，作用在下巴在一个向下的方向，在关闭运动的一部分。具有力的循环序列意外地与具有不同力的循环序列交替。力从19 N变为0 N，反之亦然，从25 N变为6 N，反之亦然。下颌运动和表面肌电图的咬肌，颞肌，舌骨上肌两侧记录在周期之前和之后的过渡从一个力的条件到另一个。3.第二个和后续周期的运动轨迹和AMA与新的力似乎是相似的。因此，适应变化的情况发生在两个开放-关闭周期。4.在19-0 N和25-6 N试验中，在0和6 N的第一个循环中，AMA大部分消失。在该循环中的力开始不同于前一循环的时刻之后约23 ms，该循环中的AMA开始不同于前一循环中的AMA。5.在反向实验中使用19或25 N的第一个循环中，在该循环中的力开始不同于前一个循环的时刻之后，AMA增加120-136 ms。6.在每个开合循环的闭合阶段，没有观察到舌骨上肌的肌肉活动;因此没有发生与电梯肌肉的共同收缩。7.得出的结论是，AMA是在一个闭环机制的控制下，潜伏期约为23毫秒。然而，反射输出有一个最大值，这取决于在以前的周期中获得的食物阻力的信息。（400字处截断摘要）
1. During chewing, a small part of the observed muscle activity is needed for the basic open-close movements of the mandible, and much additional muscle activity (AMA) is needed to overcome the resistance of the food. In chewing cycles in which a counteracting force is expected, the AMA is mainly generated by peripheral induction with a latency of approximately 23 ms. It was investigated whether an open-loop or closed-loop mechanism is involved in the control of the AMA in these cycles. 2. Subjects made rhythmic open-close movements at their natural chewing frequency controlled by a metronome. Food resistance was simulated by an external force, acting on the jaw in a downward direction during part of the closing movement. Sequences of cycles with a force were unexpectedly alternated with sequences of cycles with a different force. The force changed from 19 to 0 N and vice versa, and from 25 to 6 N and vice versa. Jaw movement and surface electromyogram of the masseter, temporalis, and suprahyoid muscles on both sides were recorded during cycles before and after the transition from one force condition to another. 3. The movement trajectory and AMA of the second and following cycles with a new force appeared to be similar. Thus adaptation to the changed circumstances occurred within two open-close cycles. 4. In the first cycle with 0 or 6 N in the 19----0 N and 25----6 N experiments respectively, a large part of the AMA had disappeared. The AMA in this cycle started to differ from the AMA in the previous cycle approximately 23 ms after the moment the force in this cycle started to differ from the previous cycle. 5. In the first cycle with 19 or 25 N in the reverse experiments, the AMA increased 120-136 ms after the moment the force in this cycle started to differ from the previous cycle. 6. During the closing phase of each open-close cycle, no muscle activity of the suprahyoid muscles was observed; thus co-contraction with the elevator muscles did not occur. 7. It was concluded that the AMA is under control of a closed-loop mechanism with a latency of approximately 23 ms. However, the reflex output has a maximum, depending on information about the food resistance gained in previous cycles.(ABSTRACT TRUNCATED AT 400 WORDS)