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Stefan, An easy way to monitor your hydration levels is to weigh yourself prior to a ride (or workout), document your total fluid intake (sports drink or water) and then capture your ending body weight again (minus your socks - the sweat ends up there!). If you are losing more than 2% of your body weight, you are losing too much weight. Here is an example:
Starting Body Weight: 170 Ending Body Weight: 168 Total Fluids Consumed: 32 oz
170-168= 2 pounds lost Add 2 pounds consumed in the form of fluid, but lost in sweat ((16 ounces equals a pound-32/16 equals 2 pounds)
4 pounds net loss. Divide the 4 pounds by the BEGINNING body weight to determine your percentage of loss: 4 pound loss/170 pre workout body weight equals - 2.3% good range
Research has determined that you don't want to lose anything less than 2%, but nothing more either. It is a tight window and needs to be evaluated with every workout so that you can determine your sweat rate given the conditions (heat, humidity, intensity levels, etc.).
If you lose more than 2%, the strength of the muscles are negatively affected (i.e. they become weak); if you lose less than 2%, then you are actually overhydrating (medically known as hyponatremia - water drunk). This is a big subject, beyond the scope of this question, but is worth all the effort you put into it.
Study your weight loss/gain with each workout and you may will be surprised what you find. Please keep me posted. -Robb Beams
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