Heat management and riding and racing the bicycle in high temperatures
Posted 30 May 2012 - 01:41 PM
Posted 30 May 2012 - 02:51 PM
Your point about evaporation is a really good one, and why I personally like ice socks better than ice in plastic - you get evaporative cooling, which absorbs ~15X as much heat per ounce of water as warming it from 32F to 100F. Also, once it melts you don't have to carry the weight if it's in a nylon sock as opposed to a plastic bag. Velonews had pictures from the USPRO championships of people using nylon stockings that way...
Posted 30 May 2012 - 11:31 PM
A couple years ago (2008?) the day they had the Tour de Winghaven was insanely hot and several of the guys were doing this. I was dying just standing there watching...
Posted 30 May 2012 - 11:32 PM
Posted 31 May 2012 - 06:17 AM
Ice bags for crits- shorter time, leave a corner open for drainage pointed down and your rectal temperature will be cooler
Posted 31 May 2012 - 06:38 AM
Posted 31 May 2012 - 11:03 AM
Well said sir. I generally avoid bringing a rectum into the discussion, but this time it seems to work nicely.
"Cooler heads prevail". (Or if you prefer: "Cooler tails prevail")
Posted 31 May 2012 - 11:23 AM
Posted 31 May 2012 - 01:17 PM
i've been told i have my head up my .... most of the time, so applicable
Posted 01 June 2012 - 06:33 AM
Exercising in the heat is essentially the only way to induce heat acclimation/acclimatization, i.e., passive exposure has only a limited effect.
Posted 05 June 2012 - 10:10 AM
Posted 19 June 2012 - 06:47 PM
"The reason for wetting your clothing is that water is 25 times more conductive than air, and as the water evaporates from your clothing/skin, the captured heat is removed with the water. (cooling towers efficiently cool large buildings using these principles). As an illustration of the effectiveness of evaporative cooling, consider the results from the following simple test done with canteens covered with water soaked fabric covering versus canteens with dry fabric covers with only 3 hours of temperature exposure:
Starting Water Temperature (both containers): 74 degrees F
Air Temperature: Varied; between 98 and 101 degrees F
Ground Temperature (in direct sunlight): 119 degrees
Water in Plain Canteen after three Hours in Sun: 117 degrees
Water in Canteen with wet cover, hung in sun but in breeze: 75 degrees
Evaporative cooling produced a 42 Fahrenheit degree difference in the interior water temperatures (23.4 degrees Celsius difference)!
Now imagine that the water inside the canteen is your blood and vital organs. You can further increase the rate of evaporation by riding your bicycle because you will create air currents that constantly lower the vapor pressure at the immediate surface area of the water. Wind plus water equals cooling. Pre-wetting your clothing can temporarily save (or extend) body fluids and can increase your stay-time to exhaustion during a heat stress event."
Posted 20 June 2012 - 11:32 AM
St Peters, MO
Cat 3 Road/Cat 3 CX
Posted 20 June 2012 - 11:43 AM
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