Narrator: This is Science Today. To reap the beneficial effects of exercise on mood, you have to continue to exercise. Those were the findings of a University of California, San Diego study of an elderly population of men and women. Donna Kritz-Silverstein, a professor of family and preventive medicine, says their long-range, community-based study differs from previous research.
Kritz-Silverstein: Most of those studies were in individuals who were either clinically depressed or they didn't eliminate people who, for physical limitations, could not be exercising. This was probably one of the few studies that had been done in a community-based sample of individuals who were not clinically depressed and they are physically able to exercise.
Narrator: The study participants' mood was measured by a standardized test called the Beck Depression Inventory.
Kritz-Silverstein: It consists of a series of 21 sets of items and within those sets of items, there are statements that people have to take the statement that best describes them. and then you basically sum their scores based on a formula.
Narrator: For Science Today, I'm Larissa Branin.