This science project was done by Donna, who is a student at Texas School for the Blind and Visually Impaired (TSBVI).
Does smell affect heartrate and cause stress?
Note: why does heartrate speed up when we are stressed?
Tea tree oil
Odor facts: Younger people are more sensitive to odors than older folks. Women are more sensitive to odors than men. Non-smokers are more sensitve to smell than smokers. People with an empty stomache are more sensitive to odors than people who just ate. People are more sensitive to odors in the morning than in the evening.
Odors can affect behavior; Mood, level of alertness, levels of anxiety, level of stress.
Positive or pleasant odors can have beneficial health effects; positive, happy mood, easier to learn and work, easier to sleep, more resistant to pain, fewer headaches or stomach aches.
Unpleasant or Negative odors can have a negative health impact; nausea, headaches, depression, increased anxiety, Elevated blood pressure, decrease in physical energy, compromise immune system, physical discomfort, increase in anger and stress, and muscular, control problems fatigue and confusion.
If someone smells a pleasant smell I belive that their heartrate would heartrate and blood preasure would calm or slow down. If someone were to smell an unpleasant smell I blelive that their heartrate and blood preasure would increase.
As I researched this topic, it became more complicated because not all people consider the same smells pleasant or unpleasant. For instance, one of my volunteers found tea tree oil to be a pleasant smell, even though I had chosen it as an example of an unpleasant smell.