Mastication effort estimated by electromyography for cooked rice of differing water content
Mastication effort estimated by electromyography for cooked rice of differing water content
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DOI：
10.1271/bbb.69.1669
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发表时间：
2005-09-01
影响因子：
1.6
通讯作者：
Sasaki, T
中科院分区：
文献类型：
--
作者：
Kohyama, K;Yamaguchi, M;Sasaki, T
这项研究的目的是量化煮熟的米饭的咀嚼程度。我们分析了正常受试者吃一勺用不同量的水（水与米重量的 1.5、2.0、3.0 和 4.0 倍）烹制而成的米饭时的咀嚼模式。提供相同重量、相同体积和相同固体含量的大米样品，并测量咀嚼肌的肌电图（EMG）。通过两口法对四种米饭样品的质地进行了仪器分析。通过肌电图评估的咀嚼次数、咀嚼时间和每次咀嚼的下颌闭合肌肉活动在用最少的水煮熟的大米样品中较高，在仪器测试中表现出较高的硬度值。用4.0倍水煮的米饭的张口时间最长，这与仪器测试中的粘性值有关。对于含水量最少的稻米，张口肌肉活动与之前的闭口肌肉活动的比率较低，这对应于仪器测试中的面积比（平衡度）。含有更多水分的软米减少了吞咽之前的总咀嚼努力，因为它需要更短的咀嚼时间。质地较软、密度较高的大米，摄入的重量并不困难，一定程度上减少了咀嚼的难度。
The objective of this study was to quantify the mastication effort for cooked rice. We analyzed mastication patterns while normal subjects ate a spoonful of cooked rice that had been prepared by cooking with different amounts of water (1.5, 2.0, 3.0, and 4.0 times the water to rice weight). The rice samples were served with the same weight, same volume and same solid content, and electromyography (EMG) of the masticatory muscles was measured. The texture of the four cooked rice samples was instrumentally analyzed by the two-bite method. The number of chews, masticatory time, and jaw-closing muscle activities per chew evaluated by EMG were higher in the rice sample cooked with least water, which exhibited a high firmness value in the instrumental test. Rice cooked with 4.0 times the amount of water exhibited the longest jaw-opening duration, which was related to the adhesiveness value in the instrumental test. The ratio of jaw-opening muscle activity to the preceding jaw-closing muscle activity was lower for the rice containing least water, this corresponding to the area ratio (balance degree) in the instrumental test. Softer rice containing more water reduced the total mastication effort until swallowing because it required a shorter mastication time. It was not difficult for the softer rice with high density to be ingested in greater weight, decreasing the mastication effort for a certain amount.