Hydrate – How to determine what that means for YOU

The events of this week have challenged us to the core, but runners are strong.  Americans all over are coming together in support of those affected by all of the tragedies of this week.  Runners are more determined than ever to take back their streets, alleys, trails, and woods to keep moving forward for themselves and for those who can no longer.  I’ll be honest that I struggled with how best to “coach” this week, both knowing that there is information to share but not wanting to say the wrong thing.  In the end, I know that I personally have decided to run and keep running; race and keep racing as a show of strength and solidarity.  So with a heavy heart and tear stained cheeks, but also full of hope and amazement of our wonderful running family I send you this information.  We still run, a lot, and we need to fuel our bodies and keep them strong.  We are running together and we are strong.  I cannot wait to celebrate you and our collective strength on May 4.

What should I drink for 13.1 miles

Your body really likes balance.  It wants and needs water but it also needs the other stuff that comes out when you sweat, which are electrolytes (mostly salt NaCl).  The question of how much to drink and what exactly to drink has been going round and round in the running community for several years.  Since I cannot do this topic justice I’ve asked Professor Steven Devor at Ohio State Exercise Physiology to help.  Below is a great discussion from Professor Devor about hydrating the proper way, which is to be very specific to EACH one of YOU.  Hydration is not a one size fits all thing and he gives a really easy way to figure out how much you need to put in to keep up with what is going out when you run.  Thanks so much to Dr. Devor for this awesome message about hydration.

Water_stop

Can you Drink Too Much?  In Short – Yes

If you want to be successful and complete longer training sessions and races you must avoid or delay dehydration caused by fluid losses from the body.  Fluids are primarily lost through sweating, breathing and using the toilet.  Years ago the advice was “drink, drink, drink,” and we assumed there was no downside to consuming as much fluid as possible. Unfortunately, consuming large amounts of water without electrolytes can lead to a condition called hyponatremia. Hyponatremia, also known as low sodium concentration or water intoxication, occurs due to prolonged sweating coupled with the dilution of extracellular sodium caused by consuming large amounts of fluid with low or no sodium.

Balance is Key

Sodium, chloride and potassium are electrolytes, and these electrolytes remain dissolved in the body fluids as electrically charged particles called ions.  Electrolytes help to modulate fluid exchanges between the different body fluid compartments and promote the exchange of nutrients and waste products between cells and the external fluid environment.  There is actually an electrical gradient across cell membranes. The difference in the electrical balance between the interior and exterior of cells facilitates nerve-impulse transmission, stimulation and action of skeletal muscles during running and other activities, and proper gland functioning.  If you consume too much water and not enough electrolytes, your body pulls electrolytes from its cells in order to create the right balance for absorption. If you consume too many electrolytes and not enough fluid, your body pulls fluids from within to create the right balance for absorption.  The bottom line is your body likes balance. Keeping your body in electrolyte and water balance, or very close to balanced, is part of the challenge as an endurance athlete.

Individualized Hydration

The easiest way to measure your sweat rate is to weigh yourself without clothes on before you do a one hour exercise session. After the hour session, return home, strip down, wipe of any excess sweat from your skin, and weigh yourself again. Assuming you did not use the toilet or consume any fluids during exercise, your weight loss is your sweat rate. For each kilogram of lost weight, you lost one liter of fluid.  To convert it to pounds, for each pound lost, you lost 15.4 oz. of fluid.  If you drink any fluids or used the rest room between the two weight samples, you will need to include both of these estimated weights in your calculations. Add fluid consumed to the amount of weight lost. Subtract estimated bodily void weight from the total weight lost.  I would be sure to record the heat and humidity conditions in your sweat test. Repeat the test in cool and hot conditions. If you are a triathlete, repeat the test for swimming, running and cycling because sweat rates will vary for each sport and vary with environmental conditions.

Through the years I have been able to come up with the following guidelines based on weight and different environmental temperatures.  They are only guidelines, so it would still still be best to do the individual tests  in a lab. None the less, I believe these are good averages.

Weight 100 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 3.0  60°F: 3.2  70°F: 3.3  80°F: 3.6  90°F: 4.1  100°F: 4.7

Weight 120 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 3.6  60°F: 3.8  70°F: 4.0  80°F: 4.3  90°F: 4.9  100°F: 5.6

Weight 140 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 4.2  60°F: 4.4  70°F: 4.6  80°F: 5.0  90°F: 5.7  100°F: 6.5

Weight 160 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 4.8  60°F: 5.0  70°F: 5.3  80°F: 5.8  90°F: 6.5  100°F: 7.4

Weight 180 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 5.4  60°F: 5.7  70°F: 5.9  80°F: 6.5  90°F: 7.3  100°F: 8.4

Weight 200 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 6.0  60°F: 6.3  70°F: 6.6  80°F: 7.2  90°F: 8.1  100°F: 9.3

Weight 220 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 6.6  60°F: 6.9  70°F: 7.3  80°F: 7.9  90°F: 8.9  100°F: 10.2

Weight 240 pounds
Fluid Ounces Per Mile Depending On The Temperature: 50°F: 7.2  60°F: 7.6  70°F: 7.9  80°F: 8.6  90°F: 9.7  100°F: 11.2W

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Posted on April 19, 2013, in Uncategorized. Bookmark the permalink. Comments Off on Hydrate – How to determine what that means for YOU.

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