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Summary
On episode 64 of 40+ Fitness, Coach Allan breaks down a meta-study called “Neuromodulation of Aerobic Exercise” and what it reveals about what aerobic exercise actually does to the brain.
He shares his own history with distance running and an ultra marathon, then walks through the chemical and hormonal effects behind the “runner’s high”: cortisol regulation, endocannabinoid and endorphin release, brain-derived neurotrophic factor, serotonin, and dopamine.
He closes with practical guidance on how hard to train, how fast to progress, and why doing your aerobic work outdoors and around other people matters for long-term brain health.
Links
- https://40plusfitness.com
Key Takeaways
- Aerobic exercise helps regulate cortisol. Cortisol should peak in the morning and settle through the day, but chronic stress keeps it too high or too low for too long. Regular aerobic activity helps bring that cycle back into balance, which matters because dysregulated cortisol is a major reason people struggle to lose belly fat.
- The “runner’s high” is a real chemical reaction, not just a feeling. Aerobic exercise releases endocannabinoids, the same receptors affected by cannabis, which in turn trigger endorphin release. Once you’re conditioned enough that the activity doesn’t feel miserable, this becomes a genuine relaxation effect.
- Training in your comfort zone can put your brain into a flow state. The brain has an alert, high-stress “beta” state and a relaxed, focused “alpha” state. Well-conditioned aerobic work raises brain-derived neurotrophic factor and lets you settle into that alpha, flow state instead of staying stuck in stress mode.
- Aerobic exercise can boost serotonin, which affects emotion and memory. Serotonin converts into melatonin, which supports sleep, and sleep is what allows memories to form properly. That makes aerobic activity relevant to long-term concerns like dementia and Alzheimer’s.
- Aerobic exercise can raise dopamine, which supports working memory and motor control. Dopamine helps with mental flexibility, learning on the fly, and early-stage motor control, all things that tend to decline with age.
- Train at 60 to 80 percent of max heart rate, and use the talk test. If you can carry on a full conversation, you’re not working hard enough; if you’re too gassed to talk at all, you’re going too hard. The sweet spot is somewhere in between.
- Don’t increase your weekly training volume by more than about 10 percent. Progression should be gradual and based on how your body is responding, not forced onto a fixed schedule.
- Environmental enrichment appears to extend longevity and cognitive function. In a rat study, animals raised in a stimulating environment with toys, color, and variety outlived and outperformed cognitively those raised in a bare cage, even though both groups had exercise equipment. Getting your aerobic work outdoors, with vitamin D and varied surroundings, may carry the same benefit.
- The book “Spark” by John J. Ratey covers this same territory. Allan points listeners to it as a deeper dive into what aerobic exercise does for the brain and the value of environmental enrichment.
“If you can carry on a conversation with someone, you’re not working hard enough, if you’re kind of gassed and can’t talk at all, you’re probably going too hard.”
Coach Allan Misner