Health and movement · 1 min read
People who ended showers with cold water missed fewer days of work
By self-report, there were 29% fewer days absent. No difference was observed on days participants felt ill.
The study, in plain language
More than 3,000 employed adults ages 18 to 65 were randomized to four groups: shower as usual or end with 30, 60, or 90 seconds of cold water. The assigned phase lasted one month, after which they could continue on their own for two more. Everything was measured with online surveys.
When the three cold-water groups were combined, the analysis estimated 29% fewer days of work absence than in the comparison group. There was no clear difference in days participants felt ill, and the three durations did not differ from each other. Participants reported everything themselves, knew which group they were in, and about 20% were lost to follow-up. The trial did not measure immune defenses or show that there were fewer infections.
The key idea
Fewer self-reported days absent did not mean fewer sick days: no clear difference appeared there.
Something to think about
When you hear that a habit improves health, what exactly was measured: symptom days or days off work? They tell different stories.
The original study
The Effect of Cold Showering on Health and Work: A Randomized Controlled Trial
Source under CC BY 4.0. English adaptation and explanation by PaperFlow, with AI assistance. The text has been reorganized for a general audience; it is not the complete paper and does not imply endorsement by its authors.
One study alone does not represent a field's consensus. Educational content does not replace professional advice. Report a possible error.