Does a cold plunge really raise dopamine by 250 percent?

In one 2000 study, blood dopamine rose 250 percent in 10 young men who sat in 14 °C water up to the neck for a full hour. No published study has measured dopamine after a typical 1- to 5-minute plunge.

Is the dopamine rise in the brain?

Not as far as anyone has measured. The study took blood samples, and dopamine in the blood comes largely from the sympathetic nerves, the same nerves that release noradrenaline. No study has measured brain dopamine during cold-water immersion in people.

How long does the dopamine boost last?

The 2000 study took its last blood sample one hour after the men left the water, so it cannot say how long any rise lasted beyond that. Claims of a lasting, hours-long boost go beyond what the paper reports.

Why do I feel good after a cold plunge, then?

Small studies do find people feel more alert and less nervous or negative after a single dip. Noradrenaline, which rises reliably in cold water, is one candidate explanation. The feeling is real, but it has not been tied to dopamine.

Can cold plunges help depression?

The evidence does not show that. A 2026 meta-analysis of 13 studies said cold-water exposure should not be regarded as a standalone treatment for psychiatric disorders. Anyone with depression should talk to a clinician about treatment.

Does a Cold Plunge Boost Dopamine? What the 250% Study Measured

The cold plunge dopamine claim rests mainly on one study. In Šrámek et al. (2000), 10 young men sat in 14 °C water up to the neck for one hour, and dopamine in their blood rose about 250 percent. That is a real finding, but it came from an hour-long immersion, it measured blood rather than the brain, and an earlier study from the same lab found no significant dopamine rise under the same conditions. Nobody has measured dopamine after a 2-minute plunge. People often do feel more alert and less tense after a cold dip, but that has not been traced to dopamine.

This page summarizes research for general information. It is not medical advice. Sudden immersion in cold water triggers a gasp, fast breathing and a jump in heart rate and blood pressure; check with a clinician first if you have heart, blood-pressure or circulation problems, or are pregnant. Cold plunging is not a treatment for depression or any other mental health condition.

Where the 250% figure comes from

The number spread widely after the Huberman Lab cold-exposure episode, which described it as a key reason people keep plunging. The source is a Prague study published in the European Journal of Applied Physiology. It set out to separate the effects of water pressure from the effects of cold, not to study mood or motivation.

Detail	What the study did
Participants	10 young men, average age 22.2
Exposure	1 hour sitting in water up to the neck, at 32, 20 and 14 °C, a week apart
Blood samples	Before, at 30 minutes, at the end of the hour, and after 60 minutes of recovery
Dopamine at 14 °C	Rose from 0.16 to 0.73 pmol/ml; reported in the abstract as a 250% increase
Noradrenaline at 14 °C	Rose 530%
Body temperature at 14 °C	Rectal temperature fell from 37.3 to 35.6 °C

Source: Šrámek et al., 2000.

The authors’ own reading was physiological. They attributed the cold responses mainly to a more active sympathetic nervous system, the fight-or-flight branch, rather than to anything specific to dopamine. Metabolic rate rose about 350 percent and the men were cold enough to shiver. Adrenaline did not change, and cortisol tended to fall.

Three reasons to read it carefully

The dose was an hour, not a few minutes. Home plunges usually last 1 to 5 minutes. The podcast itself acknowledged that few studies have looked at whether shorter, colder exposures produce similar dopamine changes. We found none that measured it.

Blood dopamine is not brain dopamine. The study measured plasma, the liquid part of blood. A 2008 analysis in Clinical Chemistry tested where that dopamine comes from and concluded that “Plasma DA is derived substantially from sympathetic noradrenergic nerves.” In other words, the rise most likely reflects the same nerve activity that drove noradrenaline up 530 percent. It says little about reward or motivation circuits in the brain, which no human cold-water study has measured directly.

The finding has not replicated cleanly. The same research group ran 1 hour at 14 °C in an earlier 1996 study of young athletes. Noradrenaline rose four-fold, but “Plasma adrenaline and dopamine concentrations were not increased significantly.” Six weeks of repeated immersions, three times a week, did not change the response either.

Does it last for hours?

A common claim is that the dopamine rise lasts for hours after you get out. The 2000 paper cannot show that. Its final blood draw came 60 minutes after the immersion ended, and the text reports the rise during cold water immersion. Any claim beyond that hour is an extrapolation.

What happens with repeated, brief cold

The best long-term data on short exposures come from a 12-week Finnish study (Leppäluoto et al., 2008). Ten women swam in ice-cold water (0 to 2 °C) for 20 seconds, and ten others used a −110 °C cryotherapy chamber for 2 minutes, three times a week. Noradrenaline rose two- to three-fold after every session for all 12 weeks. Adrenaline did not change, and cortisol was lower in later weeks than in the first, which the authors said was probably due to habituation. Dopamine was not reported.

So short, very cold exposures reliably trigger a noradrenaline response. Whether dopamine follows, and by how much, is unknown.

What mood studies actually show

People do report feeling better after cold water, and that is the more useful evidence.

One 5-minute dip: in Yankouskaya et al. (2023), 33 adults new to cold water sat in a 20 °C bath for 5 minutes. Afterwards they rated themselves as more alert, active and attentive, and reported less distress and nervousness. Brain scans showed changes in how large networks interacted. Dopamine was not measured.
One 15-minute immersion: in a 2023 study of 16 adults, 15 minutes at 10 °C left positive affect unchanged, but negative feelings and cortisol were lower three hours later. Beta-endorphins, measured in 8 of them, did not change.
Pooled evidence: a 2026 meta-analysis of 13 studies with 4,105 participants found estimates that generally favored cold water for mood, stress and wellbeing, but with wide uncertainty and mostly high risk of bias. It concluded that “The available evidence does not establish that CWE improves mood, depressive symptoms, perceived stress, wellbeing, or related outcomes.” An earlier 2025 meta-analysis of 11 studies found benefits for sleep quality and quality of life but none for mood.

The short-term lift is consistent across small studies. Lasting mood benefits are not established. For how dopamine works in motivation more broadly, see the dopamine and motivation guide.

What this means in practice

Use the feeling, not the number: if a short plunge leaves you more alert, that is a reasonable reason to do it. A 250 percent dopamine boost is not.
Longer and colder is not better for mood: the 250 percent result needed an hour at 14 °C, which is far beyond what is safe or practical at home.
Start mild: the cold plunge protocol covers temperatures and session length, and sauna vs cold plunge compares the two for mood and stress.
Not a treatment: the 2026 review warned against treating cold water as a standalone therapy for psychiatric disorders.

Safety

The first minute in cold water is the most dangerous part. The initial cold shock brings a gasp, rapid breathing and a racing heart; in the Yankouskaya study the authors describe this surge peaking within 30 seconds and settling over 3 to 5 minutes in most people. A review of cold-water immersion (Tipton et al., 2017) examines it as a precursor to drowning, cardiac arrest and hypothermia, and notes that for some claimed benefits the data are still weak. Enter slowly, never plunge alone in open water, and get out if you feel dizzy, numb or confused. For the wider picture, see the cold and heat exposure guide.