Aerobic exercise has clearly been shown to help young adults with major depression, and a new study from Rutgers University researchers suggests it may be possible to predict who would benefit from  exercise as a behavioral therapy.

“Our study needs to be replicated, but the precision medicine approach of predicting who may or may not benefit from exercise as an antidepressant is provocative,” said senior author Dr. Brandon L. Alderman, an associate professor in Rutgers’ Department of Kinesiology and Health.

“We also need to know whether exercise has a similar antidepressant effect in younger adolescents and in adults with more treatment-resistant forms of depression who have not responded well to traditional treatments, including antidepressants and cognitive behavioral therapy.”

Unique to this precision medicine study, published in the journal Psychological Medicine, is an assessment of cognitive control and reward-related brain activity, two facets of brain function that are impaired in people with depression.

Like previous studies, this one showed that aerobic exercise helps young adults with major depression. Moreover, reward-related brain activity predicted successful treatment response among young adults with major depression who completed eight weeks of aerobic exercise.

Cognitive control means processes that allow adjustments in behavior to help achieve goals and resist distractions. Reward processing (or reward-related brain activity) reflects the response to rewarding stimuli or outcomes and the ability to process and then modulate your response to positive and negative outcomes, such as loss.

Deficits in reward processing have been linked to multiple psychiatric conditions, including major depression, and may reflect anhedonia – the loss of interest in or inability to experience pleasure in cases of depression.

Many people with major depression, a complex disease, do not respond favorably to evidence-based treatments.

Depression symptoms include feelings of hopelessness, irritability, fatigue, difficulty concentrating and thoughts of suicide, according to the National Institute of Mental Health.

People suffering from depression often look for treatment via trial and error; moving in and out of various treatments, including antidepressants and cognitive behavioral therapies, according to Alderman.

The Rutgers-led team studied 66 young adults with major depression, focusing on aerobic exercise and its impact on depressive symptoms.

Three times a week for eight weeks, some participants did moderate-intensity aerobic exercise and others did light-intensity stretching. Depression symptoms were reduced by 55 percent in the aerobic exercise group versus 31 percent in the light-intensity stretching group.

While aerobic exercise did not influence reward processing or cognitive control, people with better reward processing when the study began were more likely to successfully respond to exercise treatment.

Source: Rutgers University