Research Based Evidence that Exercise Improves Depression
Tuesday, September 25th, 2007A study of 202 adult men and woman age 40 and older published in Psychosomatic Medicine found that those who went through group-based exercise therapy did as well as those treated with an antidepressant drug. A third group that performed home-based exercise also improved, though to a lesser degree.
Participants who were all diagnosed with major depression were randomly assigned to one of four groups: one that worked out in a supervised, group setting three times per week; one that exercised at home; one that took the antidepressant sertraline (Zoloft); and one that took placebo pills. After 16 weeks, the patients completed standard measures of depression symptoms.
By the end of the study, 47 percent of participants on the antidepressant no longer met the criteria for major depression. The same was true of 45 percent of those in the supervised exercise group. In the home-based exercise group, 40 percent had their symptoms go into remission. That compared with 31 percent of the placebo group.
There are several theories on why exercise might improve depression. For example, physical activity seems to affect key nervous system chemicals — norepinephrine and serotonin — that are targets of antidepressant drugs, as well as brain neurotrophins, which help protect nerve cells from injury and transmit signals in brain regions related to mood. Exercise may also boost people’s feelings of self-efficacy and promote positive thinking.










