Prescribing Movement as Clinical Treatment
A team of psychiatric researchers is arguing that physical exercise should move from informal lifestyle advice to a formal clinical treatment. A new Viewpoint published in the journal Brain Health argues that exercise should be prescribed with the same precision as medication, specifying dosage, frequency, and intensity to target cognitive and emotional outcomes.
Harnessing the Muscle-Brain Axis
The shift is rooted in the muscle-brain axis. When muscles contract, they release signaling proteins known as myokines. These proteins interact with neurotrophic, metabolic, and inflammatory pathways that directly influence brain function. According to the Brain Health authors—Carl Zhou and Nicholas Fabiano of the University of Ottawa and Stanley Wong of the University of Toronto—this mechanism supports using exercise as a targeted intervention for mood, cognition, and behavioral health.
Across diverse populations, randomized and meta-analytic evidence indicates that physical activity interventions can reduce depressive symptoms, anxiety, psychological distress, and suicide-related outcomes.
Optimizing Dosage for Mental Health
Data suggests patients do not need to meet the standard public health guidelines—150 to 300 minutes of moderate activity weekly—to see mental health benefits. Dose-response analyses indicate that psychological improvements, including the reduction of depressive symptoms, appear at roughly 75 minutes per week.
“The starting point does not have to be impressive. It has to be possible,” said Dr. Fabiano. “Small, repeated successes build self-efficacy and habit, and that is what creates the conditions for sustained activity.”
For populations with severe mental illness, such as those with schizophrenia, the potential impact is significant. Research suggests that aerobic exercise can improve cognition, and potentially improve working memory and attention, areas where traditional pharmaceuticals often fall short. Dr. Wong noted that while current cognition findings are based on a limited set of trials, the potential to address psychiatric symptoms and physical health simultaneously makes this a priority for future research.
Overcoming Structural Barriers
The authors warn that prescribing exercise without addressing structural barriers could exacerbate health inequities. They advocate for clinical coordination with community programs, subsidized transportation, and access to public recreation facilities.
The setting of activity is a recurring theme. A meta-analysis of 74 studies, involving 4.2 million participants, found that while leisure-time physical activity is associated with a 24% lower risk of dementia, benefits are not universal. Occupational physical activity—such as heavy lifting or repetitive tasks—can sometimes correlate with higher stress and increased dementia risk, highlighting that the nature of the activity matters as much as the exertion.
The Path Toward Personalized Care
Clinicians are encouraged to create a formal plan that names the type of activity, frequency, intensity, and duration. This plan should be graded, starting with small, manageable goals to build habits, while including safety considerations based on the patient’s individual health history.
Safety remains paramount. Patients with frailty, recent falls, or unstable respiratory or cardiac symptoms require medical assessment and potential supervision before beginning an exercise program. While the correlation between exercise and improved cognitive outcomes is well-documented, researchers still face limitations in distinguishing between simple association and direct causation. Genetics also influences how different individuals respond to identical exercise programs, an area that remains under active investigation.