Huberman LabUsing Deliberate Cold Exposure for Health and Performance | Huberman Lab
CHAPTERS
- 0:00 – 7:10
Introduction: Why Cold Is a Powerful Tool
Huberman introduces the episode’s focus on deliberate cold exposure for mental and physical health, performance, and thermoregulation. He previews topics including neural pathways, hormones, and specific protocols, while stressing the potency and potential hazards of temperature as a stimulus and the need for medical clearance and gradual progression.
- •Deliberate cold exposure can improve mental health, physical health, and performance (endurance, strength, cognition).
- •Understanding thermoregulation and cold’s effects on the brain and body is essential to leverage it safely.
- •Protocols will cover showers, immersion, cryo, and outdoor exposure, with explicit guidance on temperature and duration.
- •Temperature is a strong stimulus; people differ in baseline health, so medical consultation and gradual progression are advised.
- 7:10 – 13:40
Caution, Gradual Progression, and a Key Cold-Exposure Study
He reiterates safety and gradualism, emphasizing that more intense is not always more effective. Huberman previews a study where modestly cold water and extended duration greatly increased neurochemicals linked to focus and mood, illustrating how even non-extreme cold can be potent.
- •Strong stimuli like cold carry risks; proceed gradually and under medical guidance.
- •Gradual progression is not a ‘weak’ version of the protocol; it can be just as effective.
- •Study example: ~60°F (15–16°C) water immersion with extended duration produced large neurochemical increases.
- •Minimum effective dose is more important than maximal subjective discomfort.
- 13:40 – 29:10
Exercise vs. Mindfulness for Immediate Cognitive Performance
Huberman reviews a LeGrand et al. study comparing 15 minutes of moderate jogging (zone 2 cardio) to 15 minutes of mindfulness meditation before cognitive testing. Exercise increased subjective energy and significantly improved performance on visual attention and working memory tasks compared with relaxation.
- •Two groups: 15 minutes of moderate jogging vs. 15 minutes of relaxation/concentration (mindfulness-like).
- •Exercise group reported higher energy; meditation group felt calmer but less energetic.
- •Exercise led to faster completion of Trail Making Tests (A and B), reflecting better attention and working memory.
- •Practical sequence: energize with 15 minutes of moderate exercise, do cognitive work, then use mindfulness/NSDR afterwards to enhance plasticity.
- 29:10 – 47:40
Announcements and Sponsor Messages
Huberman briefly promotes upcoming live events and clarifies that the podcast is distinct from his Stanford role but aims to provide free science-based tools. He then delivers sponsor reads for Athletic Greens, ROKA, and Helix Sleep, explaining why he personally uses each product.
- •Live events in Seattle and Portland on ‘The Brain Body Contract’.
- •Podcast is separate from Stanford duties and aims to offer zero-cost science information.
- •Sponsor segments: Athletic Greens (foundational nutrition and probiotics), ROKA (performance eyewear), Helix Sleep (personalized mattresses).
- 47:40 – 57:10
Circadian Temperature Rhythms and When to Use Cold
Huberman explains the daily rhythm of core body temperature and how this interacts with cold exposure. He shows how early-day cold can boost alertness, while late-day cold might disrupt the natural nighttime temperature drop required for sleep.
- •Body temperature is lowest ~2 hours before habitual wake time (temperature minimum).
- •Temperature rises through morning and afternoon, then falls in late afternoon/evening to promote sleep.
- •Cold exposure is superimposed onto this rhythm, influencing alertness and sleepiness.
- •Using cold late in the evening can raise core temperature and potentially impair deep sleep; mornings and early day are generally better for most people.
- 57:10 – 1:11:20
Thermostat in the Brain and Why Cooling the Torso Can Backfire
He introduces the medial preoptic area of the hypothalamus as the brain’s thermostat and explains why cooling large body surfaces can paradoxically cause the body to heat up more. Huberman then introduces glabrous skin (palms, soles, upper face) as the most efficient cooling portals.
- •Medial preoptic area of the hypothalamus integrates temperature signals and regulates core temperature like a thermostat.
- •Cooling large body surfaces (torso, head) can trick the brain into thinking the environment is colder, driving compensatory heating.
- •Glabrous skin (palms, soles, upper half of face) has specialized arteriovenous anastomoses that rapidly dump heat.
- •Cooling these areas is far more efficient for lowering core temperature and preventing dangerous hyperthermia.
- 1:11:20 – 1:19:20
Forms of Cold Exposure and Practical Hierarchy
Huberman outlines different cold modalities—immersion, showers, outdoor exposure, cryotherapy, and ice garments—and ranks their effectiveness. He explains why water is far more effective than air for heat transfer and why most people will rely on immersion or showers, not cryo chambers.
- •Most effective: cold-water immersion up to the neck with hands and feet submerged.
- •Next best: cold showers; then cold outdoor exposure with minimal clothing.
- •Water transfers heat ~4x more efficiently than air; immersion is much more potent than standing in cold air.
- •Cryo chambers and ice vests/underwear exist but are costly, under-studied, or less efficient than full immersion or glabrous cooling.
- 1:19:20 – 1:34:20
Cold Exposure to Build Mental Resilience and Grit
He describes how deliberate cold reliably raises epinephrine and norepinephrine, providing a controllable stressor to train mental toughness. Huberman emphasizes mindset, the difference between deliberate and imposed stress, and introduces the ‘wall-counting’ method as a primary resilience protocol.
- •Cold surges epinephrine/norepinephrine just like other stressors but in a controlled, predictable way.
- •Deliberate exposure differs from passive/forced stress; mindset changes the physiological and psychological response.
- •Two basic approaches: time-based progression or ‘walls’ of internal resistance; Huberman favors wall-counting for long-term adaptability.
- •Training resilience means using the prefrontal cortex to override the impulse to escape when stress neurochemicals are high.
- 1:34:20 – 1:48:30
How Cold Should It Be? And the Role of Movement
Huberman formalizes his temperature rule—uncomfortably cold but safe—and addresses variability across time of day and individuals. He also explains the ‘thermal layer’ effect and why remaining motionless in water is easier than moving vigorously, which breaks that warm boundary layer.
- •Cold should make you want to exit but remain clearly safe; this threshold varies by person and time of day.
- •Adherence and consistency matter more than chasing extreme cold.
- •Staying still in water allows a warm boundary layer to form; moving breaks this layer and makes the stimulus much more intense.
- •For greater resilience stimulus at the same temperature, keep limbs submerged and gently moving.
- 1:48:30 – 2:00:30
Frequency and Weekly Dose: The 11-Minute Guideline
He discusses how often to use cold, introducing the 11-minutes-per-week guideline from human data for metabolic effects. Huberman explains how to adapt this target based on wall-counting, session length, and evolving tolerance, focusing on sustainable consistency.
- •Around 11 total minutes per week of cold immersion (split over 2–4 sessions) is an evidence-based metabolic target.
- •Wall-counting may yield sessions that vary from ~1–6 minutes; weekly totals will often fall near 11–15 minutes.
- •If 11 minutes becomes easy (few walls, low resistance), you can: lower temperature, extend duration, or increase frequency (e.g., daily).
- •Protocols must remain safe, flexible, and consistent, rather than rigidly fixed on specific numbers.
- 2:00:30 – 2:25:40
Dopamine and Eustress: Why Cold Makes You Feel So Good
Huberman dives into the Sramek et al. study on cold-water immersion and catecholamine release, showing large and sustained increases in norepinephrine and dopamine without increased cortisol. He frames deliberate cold as a powerful source of eustress—beneficial stress that can enhance mood, focus, and resilience.
- •14°C (57°F) immersion for 1 hour raised metabolism by ~350%, norepinephrine by ~530%, and dopamine by ~250%.
- •Dopamine increases persisted for at least two hours after exposure.
- •Cortisol did not significantly increase, distinguishing this from harmful distress.
- •These neurochemical changes likely underlie reports of improved mood, energy, and mental clarity after cold.
- 2:25:40 – 2:48:30
Cold Exposure for Metabolism and Fat Remodeling
He reviews human and animal work showing that repeated cold exposure converts white fat into beige/brown fat, increasing thermogenesis and resting metabolism. Huberman explains the cellular mechanisms, the cultural anecdote from Scandinavia about acclimating to seasons, and how regular cold makes people more comfortable in cold environments.
- •White fat mainly stores energy; beige and brown fat burn energy to generate heat and increase metabolism.
- •Norepinephrine released during cold binds to fat cell receptors, increasing UCP1, PPAR-γ, PGC-1α, and mitochondrial density.
- •Repeated cold exposure (e.g., ~11 minutes/week of immersion) increases brown-fat thermogenesis and slightly elevates resting metabolism.
- •Anecdotal Scandinavian practice of exposing oneself to cold in fall to tolerate winter has a real physiological basis.
- 2:48:30 – 3:05:20
Stacking Cold with Fasting and Caffeine for Greater Effects
Huberman explains that fasting naturally elevates norepinephrine, making cold more potent for metabolism and arousal. He then details how caffeine can enhance dopamine receptor availability, and how stacking caffeine, fasting, and cold may amplify mood and performance benefits, while warning against overcomplication.
- •Fasted state elevates baseline norepinephrine; adding cold further boosts stress-related neurochemistry and thermogenesis.
- •A study shows 300 mg caffeine increases striatal D2/D3 dopamine receptor availability, enhancing dopamine signaling.
- •A practical stack: wake fasted, drink coffee, wait ~60–120 minutes, then do cold exposure for amplified dopamine and focus effects.
- •He cautions against becoming overly protocol-obsessed to the point where it crowds out daily life activities.
- 3:05:20 – 3:24:10
Cold, Exercise Recovery, and When It Might Hurt Gains
He turns to physical performance, summarizing a meta-analysis on cold-water immersion after strenuous exercise. Huberman distinguishes between endurance/high-intensity efforts, where cold aids recovery and performance, and hypertrophy/strength-focused lifting, where immediate cold immersion may blunt adaptations.
- •Cold-water immersion post high-intensity exercise improves muscular power, reduces soreness, and enhances perceived recovery vs. passive rest.
- •Longer, colder immersions can be especially effective after endurance efforts for performance and creatine kinase reduction.
- •Cold immersion within ~4 hours after hypertrophy/strength sessions may reduce muscle and strength gains; best to delay or move to another day.
- •Brief cold showers post-lifting likely have smaller effects but are best delayed if maximizing strength/hypertrophy is the top priority.
- 3:24:10 – 3:36:30
Anti-Inflammatory Effects and Training Frequency
Huberman notes that cold exposure lowers inflammatory markers and can mitigate delayed-onset muscle soreness, enabling higher training frequency over time. He encourages using more frequent cold sessions during particularly intense or high-volume training cycles to manage systemic inflammation.
- •Cold reduces pro-inflammatory cytokines (e.g., IL-6) and increases anti-inflammatory signals (e.g., IL-10).
- •Short, very cold immersion after training is especially potent for lowering creatine kinase and soreness.
- •Because inflammation spikes in the hours and days after hard sessions, cold on non-training days can still be helpful.
- •Strategically increasing cold exposure during hard blocks of training can support better recovery and tolerance of higher workloads.
- 3:36:30 – 3:55:30
Glabrous Skin Cooling for Hyperthermia and Performance
He returns to glabrous skin cooling, describing a brutal hyperthermia study and how palm/sole/upper-face cooling outperformed traditional methods (neck, armpit, groin packs). Huberman explains commercial solutions like CoolMitt and simple DIY options for safely dropping core temperature and increasing endurance and strength volume.
- •In 40°C (104°F) treadmill tests, glabrous skin cooling allowed subjects to work longer and cool down faster than traditional cooling.
- •Cooling must not be so cold that it causes vasoconstriction; moderate coolness is key.
- •Commercial tech (e.g., CoolMitt) precisely controls temperature; DIY options include cold bottles, frozen vegetable packs, cool metal surfaces.
- •Glabrous cooling is powerful for preventing heatstroke, extending endurance, reducing perceived effort, and allowing more total work in strength sessions.
- 3:55:30 – 4:17:00
Palmar Cooling and Doubling Training Volume
Huberman outlines concrete research on palmar cooling between sets for dips, pull-ups, and bench press. The main benefit is increased work volume over a session and reduced soreness, not necessarily higher one-rep max in a single set, making it ideal for breaking through plateaus.
- •Studies show >100% increases in total pull-up volume and large gains in dips/bench volume over weeks with palmar cooling.
- •Gains come from sustaining higher reps across more sets, not huge increases in first-set performance.
- •Cooling between sets (1–2 minutes) keeps muscle temperatures in the optimal range for enzymes like pyruvate kinase.
- •Palmar cooling particularly shines when athletes hit plateaus in volume or endurance.
- 4:17:00 – 4:28:30
Cold Exposure and Testosterone: Hypotheses and Cautions
He addresses online claims about icing the groin to boost testosterone. Huberman notes the lack of direct, controlled human data but outlines two plausible mechanisms (local vasodilation rebound and dopamine–LH–testosterone pathway), while cautioning about tissue safety and overconfidence in unproven methods.
- •Ice-underwear/pack products exist, but no rigorous studies clearly show they increase testosterone.
- •Local cold may trigger rebound vasodilation and increased blood flow, which could promote testicular health.
- •Dopamine increases from cold can, via luteinizing hormone, modestly raise testosterone (and possibly estrogen).
- •Cold exposure likely affects several hormones; no evidence it selectively boosts testosterone without broader endocrine effects.
- 4:28:30 – 4:41:00
Timing Cold for Sleep and Final Protocol Summary
Huberman closes by tying deliberate cold back to circadian temperature rhythms and sleep, warning that late-night cold may disrupt the necessary drop in core temperature for deep sleep. He notes his own timing practices and points listeners to written protocol summaries in his newsletter.
- •Cold often increases core temperature via thermogenesis, which is great earlier in the day for alertness.
- •Doing cold late in the evening can keep core temperature too high for optimal deep sleep.
- •Some individuals, especially when very tired, may still sleep fine after late cold, but it’s generally not advised.
- •He has consolidated cold protocols for resilience, mood, metabolism, and performance in the Huberman Lab Neural Network newsletter.
- 4:41:00
Closing, Support, and Supplement Partnership
He ends with calls to subscribe, sponsor acknowledgments, and a brief explanation of his partnership with Thorne for high-quality supplements. Huberman reiterates that additional science-based tools appear on his social channels and thanks listeners for their interest in science.
- •Encouragement to subscribe on YouTube, Spotify, and Apple, and leave reviews.
- •Patreon option for further support; sponsors are the main way the show is funded.
- •Partnership with Thorne based on ingredient quality and label accuracy; discount link provided.
- •Additional content and protocols shared via Instagram, Twitter, and the Neural Network newsletter.
