Green odor attenuates a cold pressor test-induced cardiovascular response in healthy adults.
BACKGROUND
Green odor, a mixture of equal amounts of 2E-hexenal (leaf aldehyde) and 3Z-hexenol (leaf alcohol) has been demonstrated to have an anti-stress effect in rats. This study investigated whether or not green odor also has an anti-stress effect in humans.


METHODS
Changes in blood pressure, heart rate, and the skin temperature of a fingertip were observed after presenting green odor at a concentration of 0.03% or vehicle via inhalation through the nose for 10 min to eight healthy normotensive adults. We also assessed the pleasantness of green odor and its effect on mood states via assessment with the Profile of Mood States (POMS) questionnaire. Cardiovascular response to green odor and the vehicle were compared among 11 additional healthy adults by use of the cold pressor test.


RESULTS
Of 19 subjects, 15 (79%) reported that the green odor was pleasant. Green odor had no effect on blood pressure, heart rate, skin temperature, or POMS score under non-stressful conditions. In the second experiment, green odor attenuated cold pressor test-induced increases in systolic and diastolic blood pressure and facilitated the recovery of skin temperature.


CONCLUSIONS
These findings suggest that green odor has an anti-stress effect in healthy humans.
Oka
Takakazu
T
Psychosomatic Medicine Division, Department of Neurology, University of Occupational and Environmental Health, Japan, Iseigaoka 1-1, Yahatanishi-ku, Kitakyushu, 807-8555, Japan. toka@med.uoeh-u.ac.jp
Hayashida
Sota
S
Kaneda
Yuko
Y
Takenaga
Masaki
M
Tamagawa
Yoko
Y
Tsuji
Sadatoshi
S
Hatanaka
Akikazu
A