Why does swimming make me dehydrated?

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BOB ZIETARSKI

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Why does swimming make me dehydrated?
« on: 19/10/2008 13:21:20 »
BOB ZIETARSKI  asked the Naked Scientists:

Good evening, here i am in Altea, on the beach, people watching (mostly semi-naked!) when i can't understand why i'm de-hydrated after a couple of swims a day. Is this to do with the attractive girls or is the magnetic pull of a larger mass of water on a smaller (me) mass ??

a good programme.
 
regards,

bob zed
camping cap blanche (non prime loan caravan owner)

What do you think?

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Offline RD

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Why does swimming make me dehydrated?
« Reply #1 on: 19/10/2008 14:32:39 »
Quote
Yes, swimmers sweat. Biochemists estimate that active adult swimmers sweat about 1 to 1 1/2 quarts per hour.
Medical texts support this estimate. Further evidence of this rate of sweating comes from the fact that competitive swimmers,
especially distance racers, report losing 2 to 3 pounds in an average meet. Much of this weight loss is sweat.
http://www.stranco-leisure.co.uk/pdf/Chlorination_a_Matter_of_Demand_and_Dosage.pdf

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Offline Don_1

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Why does swimming make me dehydrated?
« Reply #2 on: 20/10/2008 17:05:40 »
Sweating will dehydrate you and when swimming in. After a good hard swim, get out of the water and try to dry yourself, you will notice the sweating then. As for the sea, any small amount of sea water in your mouth will have a drying effect due to the high saline concentration.
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Offline Make it Lady

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Why does swimming make me dehydrated?
« Reply #3 on: 20/10/2008 21:34:16 »
Swimming always makes me wee buckets after I have finished. Does anyone think that this has something to do with it?
Give a man a fire and he is warm for a day, set a man on fire and he is warm for the rest of his life.

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Offline Bored chemist

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Why does swimming make me dehydrated?
« Reply #4 on: 21/10/2008 19:29:31 »
Swimming always makes me wee buckets after I have finished. Does anyone think that this has something to do with it?
Glad to hear that bit.
When the body is cold ( and it often was when I was swiming) the blood vessels near the skin contract to keep the warm blood away from the skin. This saves losing heat to the water. However it also raises the blood pressure in the body. The body senses this and does something about it- it causes the excretion of some water to drop the blood volume.
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