- 作者：Akinori Tasaka ; Kai Takeuchi ; Hiromitsu Sasaki ; Takayuki Yoshii ; Ryohei Soeda ; Takayuki Ueda ; Kaoru Sakurai
- 关键词：Chewing ; Mental stress ; Salivary stress marker ; Chewing time ; Number of chewing strokes
- 刊名：Journal of Prosthodontic Research
- 出版年：January, 2014
- 年：2014
- 卷：58
- 期：1
- 页码：48-54
- 全文大小：1288 K
Purpose
We investigated the influence of chewing time on salivary stress markers.Methods
Participants performed arithmetic calculations for 30 min as stress loading, followed by chewing for 0, 5, 10, or 15 min. All experiments finished at 25 min after stress loading. With 0-min chewing, saliva was collected before stress loading (BS), immediately after stress loading (R0), and at 5, 10, 15, and 25 min after stress loading (R5, 10, 15 and 25). With 5, 10, or 15 min chewing, saliva was collected at BS and R0, immediately after chewing (Ch5, 10 and 15, respectively), and 25 min after stress loading (Ch5R25, Ch10R25 and Ch15R25, respectively). Salivary alpha-amylase activity and cortisol levels were measured to evaluate stress. Change in stress markers between R0 and Ch5, 10 and 15 or R25, Ch5R25, Ch10R25 and Ch15R25 were calculated.
Results
No significant differences were observed in rate of change in alpha-amylase activity among the chewing conditions. Rate of decrease in cortisol levels was significantly greater at 15-min chewing than at 5-min chewing. Rate of decrease in cortisol levels was significantly greater at 10 and 15-min chewing than at 0-min chewing.
Conclusion
The present results indicate that chewing time affects the reaction of the endocrine system to mental stress, and that continuous chewing for more than 10 min is effective in reducing stress.