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Objectives :The purpose of this study is to show the differences of mental stress measured with heart rate variability (HRV) and to evaluate the effects of Aromatherapy under mental stress , according to the depression index.Methods :The volunteers were allocated into 2 groups by BDI scores. Each group is divided into 2 subgroups again. After instrumentation and 10-minutes rest period, mental stress by op eration was provided for 15-minutes. HRV was recorded before and after the mental stress. Then the control g roups rested for 15-minutes. The experimental groups were treated with Aromatherapy. And then HRV was recorde d.Results :1. There were no significant differences in the mean HRT and SD NN between each group.2. LF, HF, and LF norm showed different changes in each group.3. LF/HF ratio showed significant changes. Conclusions :These results suggest that psychic factor makes an important ru le under the mental stress and the effect of Aromatherapy, and Aromatherapy is effective to recover mental s tress.Key Words :Key words : Depression, Mental Stress, Heart Rate Variability(H RV), Aromatherapy.Received : Received : August 14, 2012; Revised : August 31, 201 2; Accepted : September 04, 2012Correspondence : Geun-Woo Kim, Dept. Dongguk University Bundang Oriental Hospital, 87-2 Sunae-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea.Tel : +82-31-710-3737, Fax : +82-31-710-3780, E-mail : kgwoo8 6@hanmail.net✝This is a master`s dissertation of the Department of Oriental N europsychiatry Medicine of the Graduate School of Dongguk University on August 2012.

According to Depression Index, Difference of Response to Mental Stress and Effect to Aromatherapy