I’m interested in really breaking this down this year prior the season. I’m pretty clear on how much water I lose based on weighing before and after hot-weather workouts, but I’d like to understand better what else I’m losing. I live in Atlanta - anyone know of a good source for scientifically measuring this?
Lulu
PM me for info.
I’m interested in the same. I’m in the SF Bay Area though. Any references?
Very hard to get the actual numbers. Only accurate test is done in Barrington, IL (Gatorade lab) and not open to public. They only do pro athletes. Also it is very expensive.
How does the Gatorage method vary from my local University’s physiology lab protocol (assuming we match heat and humidity to my required race environment). What do they have that we can’t replicate?
Swimfan, you’re losing your edge…come on man…you should be talking about how Gatorade needs an aspartame version to keep all of us from getting too fat on our 6 hour rides/calorie buffets…
Dev
I’m interested in the same. I’m in the SF Bay Area though. Any references?
Only locally in Atlanta.
What is the testing source for the Atlanta area?
It is a university lab. They were recruiting people 18-40. I emailed them to see if they are still looking for new subjects. I have done the first part, but not the main experiments, which are multi-hour lab tests on a trainer. Here is more detail from my preliminary experiment report.
Thank you for allowing us to perform preliminary sweat collection from you. **Your sweat sodium is 86.5mmol/L which equals 1988 mg of sodium lost per liter of sweat. **You can determine your average sweat rate if you weigh yourself (without clothing) before and after a workout in the heat (without eating, drinking, or going to the bathroom between weights). One kilogram of weight loss (which is 2.2 lbs) equals approximately 1 liter of sweat loss. By knowing how much sweat (in liters) you typically lose per hour, you can calculate from the number we have given you about how many milligrams of sodium you lose per hour. A typical sweat rate equals 1 to 1.5 L per hour but this can vary widely so it is important to measure it for you. Your physical activity level and your sweat sodium concentration make you a perfect candidate for our study and we would like to invite you to consider enrolling in our study. Your participation as a subject will involve only two visits in total and you will receive a VO2max test (aerobic fitness) and a DEXA scan (body composition). You will also receive information about your fluid and electrolyte responses during prolonged exercise in the heat.
It is a university lab. They were recruiting people 18-40. I emailed them to see if they are still looking for new subjects. I have done the first part, but not the main experiments, which are multi-hour lab tests on a trainer. Here is more detail from my preliminary experiment report.
Thank you for allowing us to perform preliminary sweat collection from you. **Your sweat sodium is 86.5mmol/L which equals 1988 mg of sodium lost per liter of sweat. **You can determine your average sweat rate if you weigh yourself (without clothing) before and after a workout in the heat (without eating, drinking, or going to the bathroom between weights). One kilogram of weight loss (which is 2.2 lbs) equals approximately 1 liter of sweat loss. By knowing how much sweat (in liters) you typically lose per hour, you can calculate from the number we have given you about how many milligrams of sodium you lose per hour. A typical sweat rate equals 1 to 1.5 L per hour but this can vary widely so it is important to measure it for you. Your physical activity level and your sweat sodium concentration make you a perfect candidate for our study and we would like to invite you to consider enrolling in our study. Your participation as a subject will involve only two visits in total and you will receive a VO2max test (aerobic fitness) and a DEXA scan (body composition). You will also receive information about your fluid and electrolyte responses during prolonged exercise in the heat.
So for you preliminary results are 2 - 3 grams of sodium loss per hour?
<One kilogram of weight loss (which is 2.2 lbs) equals approximately 1 liter of sweat loss>>
Can you 'splain that? What’s the rest if it’s not sweat or pee? ( I assume your test subject didn’t crap behind a tree or throw up…)
<One kilogram of weight loss (which is 2.2 lbs) equals approximately 1 liter of sweat loss>>
Can you 'splain that? What’s the rest if it’s not sweat or pee? ( I assume your test subject didn’t crap behind a tree or throw up…)
1 Liter of H20 = 1kg, approx
d’uhhh… thanks
<One kilogram of weight loss (which is 2.2 lbs) equals approximately 1 liter of sweat loss>>
Can you 'splain that? What’s the rest if it’s not sweat or pee? ( I assume your test subject didn’t crap behind a tree or throw up…)
1 Liter of H20 = 1kg, approx1 litre (yes correct spelling!!) of H20 equals EXACTLY 1 kilogram.
Ah, the metric system is so logical…so long as the H20 is pure…
Swimfan, you’re losing your edge…come on man…you should be talking about how Gatorade needs an aspartame version to keep all of us from getting too fat on our 6 hour rides/calorie buffets…
Dev
I just can’t it’s just stupid, people paying $$$$$$ to “custom” nutritions and packing them on like a mule while the stuff you need is on the course.
Thats the only one I know that measures not water or sodium loss, they measure the electrolites. For the method, ask the man personally
Bob Murray, PhD, Gatorade Sports Science Institute, 617 West Main Street, Barrington, IL 60021. E-mail: bob.murray@gatorade.com