Adaptations in Mitochondrial Function Induced by Exercise: A Therapeutic Route for Treatment-Resistant Depression

Area of Science:

• Neuroscience
• Exercise Physiology
• Biochemistry

Background:

• Mitochondrial dysfunction is implicated in major depressive disorder (MDD) and treatment-resistant depression (TRD), contributing to neuroinflammation and reduced neuroplasticity.
• Physical exercise is known to positively influence mitochondrial adaptations and mental health outcomes.

Purpose of the Study:

• To review the effects of physical exercise on mitochondrial function in the context of treatment-resistant depression.
• To highlight the potential of using mitochondrial biomarkers for personalized exercise prescriptions in depressed patients, especially those with treatment resistance.

Main Methods:

• Review of emerging evidence on physical exercise interventions and their impact on mitochondrial function.
• Analysis of key signaling pathways (BDNF, AMPK, PGC-1α, CaMK) involved in exercise-induced mitochondrial adaptations.
• Examination of different exercise modalities, including aerobic, resistance, and high-intensity interval training.

Main Results:

• Physical exercise enhances mitochondrial function, biogenesis, and neuroplasticity while reducing oxidative stress and neuroinflammation.
• Specific signaling pathways mediate the beneficial effects of exercise on brain health.
• Both aerobic and resistance training, including high-intensity interval training, can induce positive mitochondrial adaptations, though optimal intensity requires further investigation.

Conclusions:

• Exercise is an effective treatment for MDD, particularly TRD, through mechanisms involving mitochondrial adaptation.
• Further research is needed to determine optimal exercise parameters (dose, intensity) and identify patient subgroups most likely to benefit from exercise interventions.