What Counts as Vigorous Activity

What if thousands of steps of gentle walking aren’t giving you the brain protection you think they are?

In this solo episode, I break down one of the most important exercise studies published in Nature Communications and what it means for your brain, longevity, and Alzheimer’s risk.

Tracking over 73,000 people for eight years using wearables, the findings are shocking: one minute of vigorous exercise is worth up to 10 minutes of moderate activity — not the outdated 2-to-1 rule. For diabetes prevention, it’s nearly 10-to-1. For cardiovascular mortality, it’s 8-to-1. And here’s what no one is saying: every outcome measured — heart disease, diabetes, metabolic dysfunction — is an independent risk factor for Alzheimer’s and dementia.

I explain why vigorous exercise is so powerful for your brain: shear stress that strengthens blood vessels, lactate that triggers BDNF, muscle fiber recruitment that protects against falls and cognitive decline, and glucose regulation that defends against insulin resistance — a driver of neurodegeneration.

Think vigorous exercise is out of reach? Good news: the study defines it as brisk stairs, carrying groceries, or playing actively with your kids. No gym required — just effort. Just 3–4 minutes of vigorous bursts per day can reduce all-cause mortality by 40% and cardiovascular events by nearly 50%.

For women over 40, this is critical. Two-thirds of Alzheimer’s cases are women, and perimenopause is a vulnerability window for the brain. Vigorous exercise can partially compensate for declining estrogen by improving glucose regulation, reducing inflammation, and protecting the brain in ways gentle movement cannot.

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Reduce your risk of Alzheimer's with my science-backed protocol for women 30+: https://go.neuroathletics.com.au/brain-code-yt

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I'm Louisa Nicola — clinical neurophysiologist — Alzheimer's prevention specialist — founder of Neuro Athletics.

My mission is to translate cutting-edge neuroscience into actionable strategies for cognitive longevity, peak performance, and brain disease prevention.

If you're committed to optimizing your brain — reducing Alzheimer's risk — and staying mentally sharp for life, you're in the right place.

Stay sharp. Stay informed. Join thousands who subscribe to the Neuro Athletics Newsletter → https://bit.ly/3ewI5P0

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Topics discussed:
00:00:00 Introduction: The Exercise Intensity Revolution 00:01:02 The Study That Changes Everything 00:04:50 The Flawed Foundation: Why Guidelines Were Wrong 00:06:50 The Real Numbers: 4 to 10 Times More Powerful 00:08:53 The Brain Connection No One Is Talking About 00:15:32 Mechanism 1: Shear Stress and Cerebral Blood Flow 00:17:38 Mechanism 2: Lactate and BDNF Production 00:19:25 Mechanism 3: Type 2 Muscle Fibers and Myokines 00:24:30 Mechanism 4: Glucose Regulation and Mitochondrial Health 00:28:18 VILPA: The 3-Minute Daily Game Changer 00:32:16 Women and Menopause: The Critical Window 00:35:19 Practical Protocols: What to Do Starting Today

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