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The first studies on exercise and depression were cross-sections, comparing the physical activity and the physical capacity levels of depressed and non- depressed individuals, Researchers have investigated whether certain types of exercise are more effective in alleviating depression than others. Exercise has also been compared to more traditional treatments such as psychological therapy, behavioral modification, and medication; meta-ytic studies suggest that chronic exercise is effective in alleviating symptoms of depression, that exercise is as effective as most traditional treatments, that exercise is effective across genders, and that mode, frequency, and intensity of exercise do not appear to moderate the effect.