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C. To Reap the Mood-Enhancing Benefits of Exercise, Don't

Narrator: This is Science Today. A study of an elderly population of men and women has found that exercise has no long-lasting effects on mood if it is stopped. Donna Kritz-Silverstein who led the University of California, San Diego study, says they based their findings on a large group of individuals who were studied in the 1980s and again, in the 1990s.

Kritz-Silverstein: Those who exercised at both points in time had the lowest depressed mood scores and those who had not exercised at the earlier visit, but began exercising or exercising at the later visit, they had scores that were comparable to those who had exercised at both visits.

Narrator: But Kritz-Silverstein found that people who had exercised earlier and then stopped were much more comparable to the people who were not exercising during either visit.

Kritz-Silverstein: It shows that exercise does have beneficial effects for mood, even among individual who are not depressed and that it's important to continually maintain this exercise, because once you stop, it doesn't seem like there's any continuous beneficial effect.

Narrator: For Science Today, I'm Larissa Branin.