Uploaded May 2026 | Updated September 2026, 2 weeks ago

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Lactate crosses the blood-brain barrier. And what it does on the other side is one of the most compelling arguments for high-intensity exercise that Dr. Stephanie has ever come across.

When lactate reaches the brain, it activates a receptor that triggers BDNF — brain-derived neurotrophic factor. BDNF drives learning, memory consolidation, mood regulation, and neural protection. It also stimulates new blood vessel growth in brain tissue and enhances synaptic plasticity.

For women in perimenopause experiencing brain fog, cognitive dullness, or overwhelm — this is not a willpower problem. It may be a signal problem. And sprinting produces that signal disproportionately, even in short doses.

This clip covers:
- How lactate crosses the blood-brain barrier
- What BDNF does for the aging brain (learning, memory, mood, protection)
- Why sprint training produces cognitive benefits beyond VO2 max
- How to pair sprints with cognitively demanding work for maximum effect
- Dr. Stephanie's own protocol when writing her book

Full episode: youtu.be/pfW_xKHNKPQ

#BrainFog #BDNF #Perimenopause #SprintTraining #CognitiveHealth #WomensHealth #BetterWithDrStephanie #MenopauseBrain