Newcastle University scientists study wrinkly hands

First published in News The Northern Echo: Photograph of the Author by , Health & Education Editor

WRINKLY fingers caused by soaking them in water for a long time have been shown to improve our grip on wet objects.

Scientists at Newcastle University studied people taking objects out of water with wrinkled fingers and again without wrinkled fingers to explain why the effect occurs.

Dr Tom Smulders, whose paper is published in Biology Letters, said: "We have shown that wrinkled fingers give a better grip in wet conditions - it could be working like treads on your car tyres which allow more of the tyre to be in contact with the road and gives you a better grip.

"Going back in time this wrinkling of our fingers in wet conditions could have helped with gathering food from wet vegetation or streams.

"And as we see the effect in our toes too, this may have been an advantage as it may have meant our ancestors were able to get a better footing in the rain."

When our hands or feet are in water for a long time, we get wrinkles. Once it was believed that this was the result of water passing into the outer layer of the skin making it swell up, but now it's known that the formation of these wrinkles is an active process.

The distinctive wrinkling is caused by blood vessels constricting below the skin controlled by the autonomic nervous system which controls bodily processes such as breathing, heart rate and perspiration.

In the study, people picked up marbles of different sizes with normal hands or with wrinkled fingers after having soaked their hands in warm water for 30 minutes. They were faster with the wet marbles if their fingers were wrinkled. However, wrinkled fingers make no difference for moving dry objects.

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