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Old 08-08-13, 04:08 PM
  #18  
Rick@OCRR
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I always have trouble hydrating enough on long rides, so I agree that it is very common for me to feel dizzy when standing up too quickly. This is even more true (for me) at altitude, i.e. above about 6,000 ft.

Not a surprise though; it's been this way for me for as long as I've been cycling (~ 40 years).

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