QOTD: Today is the first official day of summer! With that in mind, I would like to share so information I was email from my local running store. I was recently reminded of it as I was a bit discouraged from my speed work session over the weekend.
ATTQOTD: Below is some information on the topic to consider.
How Long Does It Take to Get Used to the Heat - to "acclimate"?
Exercise Physiology: Basis of Human Movement in Health and Disease
By Stanley P. Brown, Wayne C. Miller, Jane M. Eason
So, How Much Water Do You Need?
Try this Hydration Calculator:
http://beverageinstitute.org/us/hydration-calculator/
What About Salt?
Recently, Americans have been urged to pay more attention to their sodium intake. Decades ago, all foods seemed heavily salted. Then, a link between sodium intake and high blood pressure was discovered. Suddenly, "sodium - free" or "low sodium" products began flooding the consumer market. Certainly, to a degree, this is justified.
However, sodium is a required element for normal body functions. It is lost in sweat and urine and is replaced in the diet. The body has a remarkable ability to maintain sodium and water balance throughout a variety of conditions.
Longer runs and race challenge this survival mechanism.
In hot, humid conditions a large amount of sweat is lost, which can disturb sodium and water balance. Adequate hydration and sodium intake -- either via sports drinks or food -- becomes vitally important during long races.
Hyponatremia -- what is it?
Hyponatremia means a low concentration of sodium in the blood.
It is estimated that approximately 30% of the finishers of the Hawaii Ironman are both hyponatremic and dehydrated. The longer the training run or race, the greater the risk of hyponatremia.
It cannot be stressed enough that you have got to know what your needs are prior to race day. Rehearse your hydration, feeding, and salt strategy during your training sessions. There are so many variations between individuals that there is no single right answer.
Know what your body's' needs are:
- Drink frequently to attempt to stay hydrated.
- During a long, hot race, aim for a total sodium intake of approximately 1 gram per hour, as recommended by Doug Hiller, M.D. from experience with the Hawaii Ironman. Please note that this may not be appropriate for everyone.
- During training, heat acclimatization, and for several days leading up to a big race make sure that you increase salt intake by 10 - 25 grams per day.
- Sodium is also important for recovery.
- Avoid aspirin, ibuprofen, or other anti-inflammatories, and acetaminophen during exercise, but especially during a race.
- Check with your doctor if you have any health problems.