The Heart Rate Monitor monitors a person's heart beat. The sensor monitors the flow of
blood through the ear lobe. As the heart forces blood through the blood vessels in the
ear lobe, the amount of blood in the ear changes with time. The sensor shines a light through the ear lobe and measures the light that is transmitted. You can also attach the
clip to a fingertip or the web of skin between your thumb and index finger.
Suggested Experiments
- Compare the heart rate of different individuals.
- Compare the heart rate of athletes and sedentary people.
- Check a person's heart rate before and after a short period of vigorous activity(such
as doing jumping jacks). Note that the monitor should not be used during exercise.
- Monitor the recovery rate; that is, how fast a person's heart rate returns to normal
after exercise.
- Check for baroreceptor reflex; that is, changes in heart rate for a person when
reclined, sitting, and standing caused by the need for the heart to pump blood to
different levels.
- Check a person's heart rate before and after caffeine consumption.
- Check a person's heart rate before and after eating.
- Check your own heart rate at different times of the day.
- Monitor a person's heart rate as they start holding their breath. Apparently in some
people, the heart rate will slow down briefly as the body attempts to conserve
oxygen.
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