The latest research undoubtedly shows there is a fine line between adequate
& over-hydration, especially for elite athletes. Strangely, critical
de-hydration is rare. It took Prof. Tim Noakes 20 years to convince the
running fraternity of these facts. Over-hydration dilutes the blood
electrolytes causing nausea & dizziness. The defining moment which led to
the research was in the 1979 up Comrades Marathon (90km) when Johnny
Halberstadt had a substantial lead on Piet Vorster about 10km from the end.
The electrolyte content of his custom drinks had been too low. He was forced
to stop, drank 2 family size Cokes & recovered sufficiently after 20mins to
charge after Piet Vorster but was just unable to catch him.
Back of the pack runners easily get over-hydrated because they tend to drink
at every water station (1.6km apart in the Comrades). The recommendation is
every 2nd or 3rd station. It happened to me in the 2000 up run at 55km. I
started vomiting & was rather dizzy. Unable to eat or drink anything without
vomiting, I was forced to walk (I'm not the retiring type) & eventually
recovered after an hour or so & continued slowly to the end.
Alan C
-----Original Message-----
From: David Mann
Sent: Tuesday, July 07, 2015 8:14 AM
To: Pentax-Discuss Mail List
Subject: Re: Some pictures from my recent trip to France
On Jul 7, 2015, at 7:13 am, Mark Roberts <[email protected]> wrote:
She was drinking regularly but simply not absorbing it (she threw up a
lot of fluids during a post-race massage – I'll spare you the details
she usually thoughtfully supplies). Since then she's used special
electrolyte pills for any endurance events. Some people simply need
more salts in order to absorb water. This varies a lot from person to
person.
I just remembered an interview with Bevan Docherty (double olympic medallist
triathlete) who had problems when he stepped up to Ironman racing. He had
some tests done which found that he could only absorb a certain amount of
fluid per hour and any more would cause digestive problems.
Nearly all endurance events here have drink sponsors so you get a choice of
electrolyte or water. Our local marathon is small enough that they let you
send your own bottles to the aid stations, which is an option I’ll take if I
do it again.
Cheers,
Dave
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