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Page: << Prev | 1 | 2 Potential study participants were first screened to see if they had an adequate sense of smell. Fifty-six people were then admitted into the study. During three half-day sessions, half the group was handed an envelope that explained the scent they were about to smell and what to expect. The other participants were simply told they'd be smelling a variety of fruit and floral odors.
Then the researchers taped cotton balls laced with either lemon oil, lavender oil or distilled water below the volunteers' noses for the duration of the tests. The participants were monitored for blood pressure and heart rate, and the researchers took regular blood samples from each volunteer. The samples were analyzed for changes in different biochemical markers, including Interleukin-6 and Interleukin10, as well as the stress hormones cortisol and norepinephrine.
The researchers then tested the volunteers' ability to heal by using a standard test in which tape is applied and removed repeatedly on a specific site on the skin. The scientists also tested the volunteers' reaction to pain by placing their feet in 32-degree water. Finally, the participants filled out three standard psychological tests to assess mood and stress during each session.
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While lemon oil showed a clear mood enhancement, lavender oil did not, the researchers said. Neither smell had any positive impact on any of the
biochemical markers for stress, pain control or wound healing.
More information
The National Cancer Institute has more on aromatherapy and essential oils.
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