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Using Temperature for Performance, Brain & Body Health _ Dr. Craig Heller

March 13, 2026

AI Summary

5 min read

Dr. Craig Heller, a Stanford professor of biology and neurosciences, explains that the body's ability to regulate temperature is one of the most powerful levers for improving both physical and mental performance. The conversation centers on a surprising fact: the most effective way to cool the body is not through the neck, torso, or head, but through the palms of the hands, soles of the feet, and upper face—areas of glabrous (hairless) skin. These surfaces contain specialized blood vessels called arteriovenous anastomoses (AVAs) that act as the body's radiators, shunting blood directly from arteries to veins and bypassing capillaries. When used correctly, cooling these surfaces can dramatically increase work output, reduce muscle soreness, and improve recovery, all without the risks associated with other performance-enhancing methods.

The Body's Radiators: Glabrous Skin and AVAs

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What you'll learn

  • 1 (07:50) **Intro to thermoregulation** - Dr. Heller explains how body temperature control can dramatically improve athletic and cognitive performance
  • 2 (08:37) **Cold showers and ice baths basics** - Immediate effects include adrenaline release and vasoconstriction; whole-body immersion differs from showers due to surface area
  • 3 (13:24) **Boundary layer effect** - Still water next to skin creates insulation; movement in cold water increases heat loss
  • 4 (14:39) **Pre-cooling for aerobic work** - Brief cool shower or immersion before long runs or endurance efforts increases heat absorption capacity and delays fatigue
  • 5 (17:19) **Anaerobic/strength training heat limits** - Local muscle temperature rises rapidly during heavy sets; heat shuts down pyruvate kinase and stops further reps
  • 6 (24:03) **Why direct muscle cooling fails** - Skin, fascia, and muscle are good insulators; heat leaves muscles only via blood
  • 7 (25:19) **Neck and head cooling myths** - Cooling the neck or head can trick the brain's thermostat, reduce perceived effort, and actually allow dangerous core temperature rise

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Show Notes

Using Temperature for Performance, Brain & Body Health _ Dr. Craig Heller

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