Immediate Antidepressant Effects of Exercise Linked to Fat-Derived Hormone

A recent study published in *Molecular Psychiatry* reveals that a single thirty-minute session of physical activity can produce immediate antidepressant effects in both humans and mice. The research identifies a specific biological pathway involving adiponectin, a hormone released by fat cells, which enhances brain plasticity and improves mood. This finding suggests that short-term exercise could serve as an accessible intervention for alleviating depressive symptoms, particularly significant given the global burden of major depressive disorder.

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The study involved forty university students, half of whom exhibited symptoms of anxiety or depression. Participants completed a thirty-minute treadmill running session, after which psychological assessments indicated a reduction in mood disturbance and an increase in vigor and self-esteem.

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In parallel, a mouse model simulating depression through chronic unpredictable stress underwent the same treadmill protocol. Behavioral tests showed that exercised mice exhibited significantly reduced depression-like behaviors within two hours, with effects lasting up to twenty-four hours. The anterior cingulate cortex, a region crucial for emotion regulation, displayed increased neuronal activity, primarily in glutamatergic neurons, during exercise.

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The researchers explored the role of adiponectin in mood regulation. Following exercise, levels of adiponectin in the medial prefrontal cortex rose, correlating with reduced depression-like behavior. The study established that glutamatergic neurons in the anterior cingulate cortex possess receptors for adiponectin, specifically AdipoR1. When these receptors were genetically removed, the antidepressant effects of exercise were negated, confirming the hormone's role in mood enhancement.

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Further investigation revealed that adiponectin signaling prompted the translocation of the protein APPL1 into the cell nucleus, influencing epigenetic regulation and promoting the formation of new dendritic spines—indicators of neural plasticity. This process is crucial for the brain's structural rewiring, linking the molecular changes directly to mood improvement.

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The findings underscore the potential of a single bout of moderate-intensity exercise as a low-cost intervention for immediate mood enhancement. Sonata Suk-yu Yau, a principal investigator in the study, emphasized the importance of non-pharmacological measures to mitigate the rising prevalence of adolescent depression.

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However, the study has limitations, including a small sample size and a focus on male mice, raising questions about the generalizability of the results. Future research aims to explore the optimal intensity and duration of exercise for mood improvement, as well as the influence of gender and age on responses to exercise.

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Yau stated, “Physical exercise is one of the most accessible and low-cost interventions for immediately reducing depressive symptoms, and it may also be effective in preventing the development of depression.” The research team aims to develop population-based guidelines for exercise prescriptions to enhance mood and prevent depression.

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• “Depression is one of the most devastating disorders, contributing significantly to disability worldwide.” — Sonata Suk-yu Yau, Associate Professor, Hong Kong Polytechnic University

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• “Free daily newsletter “This study provides clinical evidence for the effectiveness of a single session of exercise in alleviating depressive symptoms.” — Sonata Suk-yu Yau

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• “Our long-term goal is to provide robust scientific evidence for both the acute and sustained beneficial effects of physical exercise in alleviating depressive mood among the general population with mood disturbances, as well as patients with depression,” — Sonata Suk-yu Yau

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This study highlights the promising role of exercise in mental health, paving the way for further exploration of its benefits in combating depression.

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