Researchers at Cardiff University’s Common Cold Centre paid 90 students to sit for 20 minutes with their bare feet in buckets of cold water. A few days later the study found that 13 of the students reported cold symptoms, such as a runny nose or sore throat, compared to five in a control group of 90 students who kept their feet dry in socks and shoes.
“When you dip your feet into cold water, you cause a pronounced constriction to the blood vessels in the nose,” said the centre’s director Professor Ron Eccles.“This is one of the factors we believe that actually can aid the virus by lowering the defenses within the nose and triggering the symptomatic infection,” he told the BBC.
Previous studies inoculated patients with the cold virus and then chilled them, but failed to find any link between temperature and catching a cold. Eccles said his research differed by taking healthy people from the general population and then chilling them.
“We believe that when common colds are circulating in the community, for every person who’s actually got a cold there are two or three who are infected but haven’t developed symptoms.
“And it’s when you chill these people that you can convert a sub-clinical infection or symptom-free infection into a common cold with symptoms.”
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