# Hour-long cold-water immersions before practice left eight young men trailing five controls, who improved a precision computer task by 84 percent, while a five-predictor model combining physiological and perceptual measures accounted for most of the performance variation

> Cold exposure is often framed as a test of grit, yet a small laboratory study suggests it can interfere with learning when the cold arrives just before practice. In a group of only 13 young men, the five participants who stayed warm...

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Published: 2026-08-25T23:25:02+00:00
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Cold exposure is often framed as a test of grit, yet a small laboratory study suggests it can interfere with learning when the cold arrives just before practice. In a group of only 13 young men, the five participants who stayed warm improved a computer based precision task by 84 percent across the final three days, while the eight men who spent an hour in cold water before each session failed to show the same learning jump.

The work, published in [Temperature](https://doi.org/10.1080/23328940.2025.2580859), focused on a narrow question: what happens when repeated cold stress comes immediately before a task that depends on timing, attention and hand control. **Frank E. Marino** and **Michael Chang** tracked both performance and body responses, then linked the weaker results in the cold group to breathing changes, stress hormones and how uncomfortable the participants felt.

The [PubMed record](https://pubmed.ncbi.nlm.nih.gov/41788910/) shows a clear pattern inside this tiny sample, but the scope stays limited. All 13 participants were male, their average age was about 20 and the task involved a joystick controlled game of falling blocks rather than the many kinds of learning people do at work, in school, or in sports.

## How the six day test worked

Researchers trained every participant on the same **visuomotor task** once a day for six straight days. Each trial lasted 19 minutes and asked the men to control falling blocks with a joystick, a setup that required quick visual processing and fine motor adjustment rather than brute force. The first three days let the team establish a shared baseline before the group split into different conditions.

Repeated practice matters in studies like this because learning rarely appears in a single leap. A person usually gets better by trimming small errors, anticipating the pace of the task and syncing hand movements with incoming visual information. By spreading the training over six days, the researchers could look for a trend in improvement instead of asking whether one short cold exposure caused a one day slump that disappeared by the next session.

After that baseline phase, five men entered the **control group** and eight entered the **cold stress group**. On days four through six, the cold stress group completed a 60 minute head out **cold-water immersion** immediately before the task. Core body temperature in that group fell by about 0.5 degrees Celsius, while the control group stayed stable.

Alongside task scores, the team tracked heart rate, oxygen use, breathing patterns, epinephrine, **norepinephrine**, cortisol and two subjective ratings: **thermal comfort** and temporal judgment, which reflects how accurately a person senses the passage of time. A Charles Sturt University [research summary](https://researchoutput.csu.edu.au/en/publications/physiological-and-perceptual-changes-underly-the-decline-in-cogni/) lists the same design details and publication record, including the paper's early online date of November 6, 2025, before its 2026 journal issue appearance.

## What changed after the cold exposures

Performance separated most sharply during the final three sessions. The control group kept learning and ended that stretch with an 84 percent improvement, while the cold exposed group showed an attenuated response instead of the same upward curve. The paper's abstract does not report a matching percentage gain for the cold group, so the safest reading is simply that their learning was significantly weaker.

Body signals moved in the same direction. Men in the cold condition showed higher ventilation, faster respiratory frequency, stronger inspiratory drive and changes in stress related chemicals that did not appear in the men who remained warm. Subjective ratings shifted as well, which suggests the experience of feeling cold and unsettled stayed part of the learning environment rather than fading into the background.

Temporal judgment adds an especially interesting clue. When people lose a steady sense of timing, a task that depends on rhythmic correction can become harder even if muscles still have enough strength to move the joystick. The study does not claim that distorted time sense was the only reason scores lagged, yet it does place that perception measure beside breathing and stress chemistry in the group of predictors that traveled with poorer performance.

Past research gives that result a useful frame without proving the same mechanism in every setting. A review on [stress and learning](https://pubmed.ncbi.nlm.nih.gov/15054128/) noted that stress can sometimes help certain forms of learning and hinder others, depending on timing and task demands. Marino and Chang's study fits the side of that literature where a stressful state arrives close enough to practice to disrupt the steady gains people often build through repetition.

## Why breathing and stress signals mattered

The strongest numbers in the paper connect weaker task scores with the body's response to cold. Within the cold stress group, performance fell as **respiratory frequency** rose, with a reported correlation of r = -0.56. Regression analysis then showed that inspiratory drive, norepinephrine, respiratory frequency, thermal comfort and temporal judgment together explained much of the variation in scores, with an R*2* of 0.87.

One practical way to read that result is that the participants were learning under a body wide alarm state. Faster breathing can pull attention toward discomfort and away from careful control. A stronger catecholamine response may sharpen arousal for a short period, yet that same surge can make fine adjustments less stable when a task depends on timing and precise movement from moment to moment.

Broader cognitive science also points in that direction. A well known review of [executive functions](https://pubmed.ncbi.nlm.nih.gov/23020641/) described how stress can impair the mental control systems that support focus, inhibition and flexible adjustment. Marino and Chang did not test every one of those systems directly, but their results match the idea that cold can interfere with the control layer sitting above the hands and eyes.

## What the study can and cannot say

Readers should keep the sample size in plain view. Thirteen participants is a very small study and the key comparison rests on eight cold exposed men against five controls. A sample that small can still produce statistically significant findings, especially when the measured effect is strong, but it leaves less protection against random variation and makes population wide claims far too ambitious.

The participant pool also narrows the article's reach. The study involved young adult men, one laboratory task and repeated exposures that happened immediately before practice. It does not establish what would happen in women, older adults, trained athletes, people with health conditions, or workers performing complex real world jobs. It also does not tell us whether milder cold, shorter exposure, or a longer recovery gap would change the outcome.

Laboratory precision tasks still have value because they let researchers isolate one kind of learning under controlled conditions. The tradeoff is that a falling block game cannot stand in for every skill that people may practice after a cold plunge. Ball sports, keyboard work, marksmanship, surgery and music performance each draw on different mixes of attention, memory, force control and fatigue resistance. Future studies would need larger groups and several task types before anyone could map where the risk is highest.

Even with those limits, the paper adds a concrete warning for anyone who pairs cold exposure with skill practice. Repeated immersion may leave some people feeling alert, yet the **acute cold stress** in this experiment lined up with weaker learning on a precision task. The clearest takeaway stays modest: in eight cold exposed young men, compared with five warm controls, pre task cold stress coincided with poorer improvement and with physiological strain that explained much of the drop.