Endurance.Net Ridecamp Archives

Thanks, Beverly, for your explanation of why I always seem to need to 
pee a lot early in rides, especially cold ones.  It's kind of a catch 22 
isn't it: more urine being created but also the need for extra hydration 
in cold and altitude.  Darn!
Laney

Beverley H. Kane, MD wrote:
> On 10/2/06 11:06 PM, "Lynne Glazer" <lynne@xxxxxxxxxx> wrote:
>
> > The only thing I can't do is COFFEE.  The
> > diuretic effect is somehow magnified in the cold weather of a dawn
> > start, yikes. 
>
> Ah, you're describing physiological process of "cold diuresis." It's the
> opposite of sweating, where water is evaporated out the skin. In the cold,
> blood is shunted away from the periphery (hands, feet, skin, superficial
> tissues) and into the central regions of the body, including the kidneys.
> When the kidneys get more blood, they produce more urine.
>
> Important to have extra hydration in cold and at altitude.
>
> Beverley
>
>
>
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