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J Altern Complement Med. 2014 Sep;20(9):727-31. doi: 10.1089/acm.2014.0029. Epub 2014 Jul 23.

Effect of olfactory stimulation by fresh rose flowers on autonomic nervous activity.

Author information

1
1 Center for Environment, Health, and Field Sciences, Chiba University , Chiba, Japan .

Abstract

OBJECTIVE:

To clarify the effect of olfactory stimulation by fresh rose flowers, which exude a strong fragrance, on heart rate variability.

SETTINGS:

A chamber with an artificial climate maintained at 25°C with 50% relative humidity and 230 lux illumination at the Center for Environment, Health, and Field Sciences, Chiba University, Japan.

PARTICIPANTS:

Nineteen female university and graduate students (mean age, 21.6±1.5 years; age range, 19.0-26.0 years).

INTERVENTIONS:

Fresh rose flowers as an olfactory stimulant, with air as a control.

OUTCOME MEASURES:

Heart rate variability and subjective evaluations. The power levels of the high-frequency (HF) (0.15-0.40 Hz) and low-frequency (LF) (0.04-0.15 Hz) components of heart rate variability were calculated by the maximum-entropy method. The HF power was considered to reflect parasympathetic nervous activity. The LF/HF power ratio was determined to reflect the sympathetic nervous activity. A modified semantic differential method was used to perform subjective evaluations.

RESULTS:

Fresh rose flowers induced (1) a significant increase in parasympathetic nervous activities and (2) an increase in "comfortable" and "natural" feelings.

CONCLUSION:

The findings indicated that olfactory stimulation by fresh rose flowers induced physiological and psychological relaxation.

PMID:
25055057
DOI:
10.1089/acm.2014.0029
[Indexed for MEDLINE]

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