Why It Matters

Cold plunges have become popular in wellness circles, often promoted as a way to sharpen focus, increase mental resilience, and improve executive function. While a “jolt” of alertness can certainly be experienced from a frigid plunge, the evidence for actual & sustained cognitive benefits is more muted than many claims suggest.

What the Research Shows

Most research on acute cold exposure shows the opposite of a cognitive boost.

A 2021 systematic review found that 15 of 18 studies reported impaired cognitive performance during a single cold exposure, particularly in attention, processing speed, memory, and executive function. Importantly, these impairments occurred even before significant drops in core body temperature, suggesting that the stress of cold itself interferes with cognitive processing.

However, the picture may differ with repeated short exposures rather than prolonged acute stress. For example, a small 2025 study found that participants who completed 10-minute cold water immersion at 10°C three times per week for four weeks showed improvements on the Trail Making Test, a task related to processing speed and executive function. Sleep disturbances also improved. Still, this study had only 13 young, healthy participants. In contrast, a review study from 2017 showed no added cognitive benefits from repeated cold exposures. We need robust replication with much larger numbers before we can draw better conclusions.

My Take

Cold plunges can certainly make you feel more alert (sympathetic nervous system activation —> catecholamine surge), but whether that translates into measurable improvements in attention, executive function, or other cognitive domains remains unproven. The subjective experience of alertness and objective cognitive enhancement are distinct and different outcomes, and the evidence currently supports only the former. Cold plunges should not be viewed as a reliable cognitive enhancer at this point.

It is known that repeated cold plunge exposure can lead to autonomic “rebalancing” — away from sympathetic (flight or flight) activation and toward greater parasympathetic tone (the ‘rest and restore’ system). However, the evidence (so far) does not clearly support that this shift enhances prefrontal-mediated executive functions over time.

For improving attention and executive function—especially in adults with ADHD—there is far stronger evidence for interventions like sleep optimization, regular exercise, and evidence-based ADHD treatment.

Sources

Falla M, Micarelli A, Hüfner K, Strapazzon G. The Effect of Cold Exposure on Cognitive Performance in Healthy Adults: A Systematic Review. International Journal of Environmental Research and Public Health. 2021;18(18):9725. doi:10.3390/ijerph18189725.

Knill-Jones J, Shadwell G, Hurst HT, et al. Influence of Acute and Chronic Therapeutic Cooling on Cognitive Performance and Well-Being. Physiology & Behavior. 2025;289:114728. doi:10.1016/j.physbeh.2024.114728.

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