The World Health Organization predicts that depression will create the second greatest burden of disease by 2020, requiring cost-effective prevention and intervention strategies. The evidence to support the benefits of exercise in offering protection from depression and as an intervention in the treatment of mental illness is growing. The literature is reviewed with 11 prospective longitudinal studies that include measures of physical activity and depression at two or more time points showing a protective effect from physical activity. Fifteen randomized controlled trials (RCTs) and three meta- analyses provide evidence that exercise can reduce depression and that it can be as effective as cognitive therapy. Four RCTs report exercise as an intervention in alcohol addiction and two RCTs in the use of illicit drugs. While many of the studies reviewed have methodological weaknesses, including lack of concealment in randomization, limited use of intention to treat and blinding, the benefits of exercise far outweigh the risks. There is evidence that exercise protects against depression and is an effective intervention and adjunctive intervention for the treatment of mild to moderate depression. Exercise provides some health and psychological benefits as an adjunct to treatment in complex mental health problems such as alcohol and drug rehabilitation. [1]
[1] MARIE E. DONAGHY
School of Health Sciences, Queen Margaret University, Leith Campus, Edinburgh