Effect of body posture on chewing behaviours in healthy volunteers
Effect of body posture on chewing behaviours in healthy volunteers
复制标题
身体姿势对健康志愿者咀嚼行为的影响
DOI：
10.1111/joor.12555
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发表时间：
2017
影响因子：
2.9
通讯作者：
Inoue M.
中科院分区：
文献类型：
--
作者：
Iizumi T.;Magara J.;Tsujimura T.;Inoue M.
咀嚼是进食过程中必不可少的，也是进食行为的重要组成部分。与食物团相关的许多因素，例如食物团的质地和大小，已知会影响咀嚼。本研究的目的是确定身体姿势对（i）首次吞咽前咀嚼持续时间和（ii）咀嚼相关EMG活动模式的影响。我们要求10名健康成年人咀嚼8克米饭与硫酸钡，而我们记录咬肌，舌骨上和舌骨下肌肉活动，同时收集视频荧光图像。参与者以直立或斜躺的姿势咀嚼。咀嚼持续时间定义为从咀嚼开始到第一次吞咽的时间，不同位置之间没有差异。然而，咀嚼持续时间的变异性较大，在直立与斜倚位置，和咀嚼持续时间在斜倚位置分布在15秒左右。咬肌活动以时间依赖性方式逐渐减少，并且在咀嚼的早期与晚期阶段显著较大。舌骨上的活动是显着较大的早期与中期阶段的咀嚼在直立位置。最后，咀嚼肌每秒活动量与咀嚼持续时间的变化呈负相关，即在仰卧位咀嚼持续时间的增加越大，咀嚼肌每秒活动量的减少越多。这些结果表明，咀嚼行为的位置依赖性变化，如咀嚼持续时间和EMG活动所描述的，可能会因参与者而异。
Mastication is essential to the eating process and forms an important part of feeding behaviour. Many factors related to the food bolus, such as bolus texture and size, are known to influence mastication. The aim of this study was to determine the effects of body posture on (i) chewing duration prior to the first swallow and (ii) patterns of mastication‐related EMG activity. We asked 10 healthy adults to chew 8 g of steamed rice with barium sulphate while we recorded masseter, suprahyoid and infrahyoid muscle activity and simultaneously collected videofluorographic images. Participants chewed in either an upright or reclining position. Chewing duration, which was defined as the time from the start of mastication to the first swallow, was not different between the positions. However, the variability of chewing duration was larger in the upright versus reclining position, and the chewing duration in the reclining position was distributed around 15 s. Masseter activity gradually decreased in a time‐dependent manner and was significantly larger at the early versus late stage of mastication. Suprahyoid activity was significantly larger at the early versus middle stage of mastication in the upright position only. Finally, masseter activity per second was negatively correlated with changes in chewing duration, that is, the larger the increase in chewing duration in the reclining position, the more the decrease in masseter activity per second. These results suggest that position‐dependent changes in chewing behaviours, as described by chewing duration and EMG activity, may vary among participants.