| 研究実績の概要 |
In the present study, we examine the effects of preference of flavor on during ingestion behavior by monitoring the electorocardiogram (ECG) and the surface electromyogram (EMG).We investigated chewing behavior during ingestion of the two types of gum, favorable flavor gum and unfavorable flavor gum in adult male human subjects (age; 25-35 years old). ECG was monitored autonomic nerve activity from heart rate variability (HRV) analyzing R-R intervals, and surface EMG was monitored for masticatory muscle movements.
Specifically we focused on the autonomic nervous activity during post-chewing stage and correlated it to individual chewing patterns. Four types of autonomic nervous activity were observed; 1; sympathetic nervous activity was getting dominant. 2; parasympathetic nervous activity was getting dominant. 3; both sympathetic and parasympathetic nervous activities were shown as almost the same degree. 4; hard to analyze because of the behavior was shown randomly. In group 1, masticatory muscles activity tend to increase, however some subjects and some parameters in the chewing patterns was decreased. In group 2, masticatory muscles activity tend to decrease. In group 3, both increasing and decreasing muscle activities were observed. In group 4, we could not find the definitive alterations of autonomic nervous activity and mastication activity.
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