The most frequently cited study – basically the only study – to suggest real-life health benefits of cold exposure is from the Netherlands by Buijze et al. This study investigated the effect of ending your showers with 30, 60 or 90 seconds (3 groups + control group) of the coldest shower temperature (minimum 10°C based on Dutch ground temperature at the time). They were told to do this for at least 30 days and recommended to do it for 90 days, which most did. During this 90-day period, the researchers monitored the subjects’ health.
