After a stressful day, full of aches and pains, there is nothing better than a nice long soak in the bath. I grew up in a house with just a bath, no shower. So it became an everyday occurrence that I massively enjoyed. Yes, they can be a pain in the arse to run when you’re in a rush but the effort is worth it. Once it’s run, to just recline and relax for 30 minutes or so is sheer bliss. It even became part of my post rugby ritual, shower to remove the mud, then soak in the bath when I got home.
Last night I was enjoying this exact experience at the end of a long, alcohol fuelled weekend, when I found myself looking at my hands and thinking – hands have started to go wrinkly, probably time to get out!! We all know tat if we stay in water for too long then this happens and usually use it as a sign to get out, but why does it happen?
Luckily the good people of Scientific American have interviewed Dermatologist Laurence Meyer (University of Utah) and here is the explanation he offered up:
The epidermis, or outer layer of the skin, is made up of cells called keratinocytes, which form a very strong intracellular skeleton made up of a protein called keratin. These cells divide rapidly at the bottom of epidermis, pushing the higher cells upward. After migrating about halfway from the bottom of this layer to the top, the cells undergo a programmed death. The nucleus involutes, leaving alternating layers of the cell membrane, made of lipids, and the inside, made largely of water-loving keratin. The outer layer of the epidermis, called the stratum corneum, is thus composed of these alternating bands.
When hands are soaked in water, the keratin absorbs it and swells. The inside of the fingers, however, does not swell. As a result, there is relatively too much stratum corneum and it wrinkles, just like a gathered skirt. This bunching up occurs on fingers and toes because the epidermis is much thicker on the hands and feet than elsewhere on the body. (The hair and nails, which contain different types of keratin, also absorb some water. This is why the nails get softer after bathing or doing the dishes.)
Soaking in the tub does hydrate the skin, but only briefly. All the added water quickly evaporates, leaving the skin dryer than before. The oils that hold the water in have usually been stripped out by the bath�especially if soap and hot water are involved. But if oil is added before the skin dries, much of the absorbed water is retained. Thus, applying a bath oil or heavy lotion directly after a bath or shower is a good method of hydrating the skin.
So in essence, this wrinkling is formed by ridges of skin absorbing water, separated by lines of skin tat don’t absorb water and swell. Today I guess I learnt that that wrinkling is nothing to worry about and it explained why it doesn’t happen to areas of skin such as your arms.
DC