Huberman LabUsing Temperature for Performance, Brain & Body Health | Dr. Craig Heller
At a glance
WHAT IT’S REALLY ABOUT
Cool Your Hands, Boost Performance: Dr. Heller’s Temperature Revolution Explained
- Dr. Andrew Huberman interviews Stanford physiologist Dr. Craig Heller on how body temperature regulation profoundly impacts physical and cognitive performance, recovery, and safety.
- Heller explains why traditional cooling strategies (cold towels on neck/head, ice vests, ice baths) are often ineffective or counterproductive, and why specialized ‘heat loss portals’ in the palms, soles, and upper face are the real keys.
- Using properly controlled palmar (glabrous skin) cooling, his lab has repeatedly shown dramatic increases in work volume (often 2–3x) and endurance, with minimal delayed onset muscle soreness.
- They also explore implications for sport, military, medical recovery, sleep, hypothermia/hyperthermia treatment, and misconceptions about brown fat, shivering, and energy drinks.
IDEAS WORTH REMEMBERING
5 ideasUse glabrous skin (palms, soles, upper face) as primary heat-loss portals for performance and safety.
Special arterio-venous anastomoses (AVAs) under hairless skin in the palms, soles, and upper face shunt large volumes of blood directly from arteries to veins, enabling rapid heat exchange. Cooling these areas with moderately cool (not ice-cold) surfaces can double endurance in heat and dramatically extend work volume in resistance training, while heating them can rapidly re-warm hypothermic individuals. In contrast, most of the hairy body surface is relatively well insulated and much less efficient for active heat transfer.
Avoid ice-cold water or packs on hands and portals; use cool, not freezing, temperatures to prevent vasoconstriction.
Very cold stimuli (like ice water or frozen bottles held continuously) trigger reflex vasoconstriction in the AVAs, effectively shutting down the very heat-loss pathways you're trying to exploit. Heller’s lab found optimal performance gains with cooling surfaces that feel merely ‘cool,’ not painfully cold; in practice, the most effective heat extraction happens within the first 2–3 minutes before vasoconstriction kicks in. A simple self-check: if your palm feels cold to another person after cooling, you likely overcooled and constricted the vessels.
Pre-cooling before aerobic efforts and intermittent cooling between anaerobic sets can dramatically enhance performance.
Lowering core temperature slightly before endurance efforts (e.g., cool shower, brief portal cooling after warm-up) increases the body’s ‘heat sink’ capacity so you can run or work longer before temperature becomes limiting. For anaerobic work like dips, push-ups, or squats, localized muscle temperature can skyrocket while blood flow cannot increase proportionally, risking ‘cooking’ the muscle and enzyme shutdown (e.g., temperature-sensitive pyruvate kinase). In controlled experiments, 2–3 minutes of palm cooling between sets led to doubling or tripling total work volume over weeks, with significant performance gains retained even when cooling was later removed.
Common cooling practices (cold towels on neck, torso ice vests, brief ice baths) can be misleading or counterproductive.
Cooling the neck, head, or torso strongly stimulates skin temperature receptors that feed into the hypothalamic ‘thermostat,’ making you *feel* cooler while core temperature may continue rising. In field studies, cooling standard ‘artery zones’ (neck, armpits, groin) with cold packs was only half as effective at reducing core temperature as placing the same packs on the glabrous skin portals (palms, soles, upper face. Furthermore, cooling the neck can protect the brain transiently but may also trick athletes into resuming hard efforts while still dangerously hot internally.
Proper cooling can greatly reduce delayed onset muscle soreness (DOMS) despite much higher training loads.
In multiple experiments, subjects who used palmar cooling between heavy sets vastly exceeded their normal training capacities (e.g., Stanford students surpassing 800 push-ups in one session, an NFL tight end tripling his dip volume to ~300 in a month). Despite acute overreaching, those using cooling reported minimal delayed onset muscle soreness compared to non-cooled controls doing lower volume. This suggests that strategically limiting overheating, rather than total load per se, plays a large role in muscle damage and perceived soreness.
WORDS WORTH SAVING
5 quotesYou literally have the capacity to cook your muscles.
— Dr. Craig Heller
Why would you endanger your health with steroids when such an ineffective tool gives you maybe one percent per week, and we’re seeing three hundred percent in a month with cooling?
— Dr. Craig Heller
You can feel great and have a dangerously hyperthermic temperature.
— Dr. Craig Heller
If your car is overheating and you have a hose, you don’t spray the tubes—you spray the radiator. The palms, soles, and face are your radiators.
— Dr. Craig Heller
We didn’t discover these blood vessels; they’re in Gray’s Anatomy. Nobody knew what they were for.
— Dr. Craig Heller
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