5 Ways to Keep Your Cool When the Mercury Spikes
If anything is certain in exercise science, it’s that each year, a study will come out that flies in the face of what athletes hold as gospel. Take, for example, the recent one about water consumption, from England’s University of Exeter. The sporting community has long assumed that drinking large amounts of H2O helps keep body temperature down when outside temperatures soar. Not so, say the British white coats. You can drink water until you’re blue in the face, but unless the water is cold to begin with, it won’t have the slightest effect on body temp. And that can have dangerous repercussions—more people die each year from heat stroke than from all natural disasters combined. So before you strap on a sweatband and brave the next heat wave, make sure you’ve cooled your heels with these five guidelines.
Check Yesterday’s Heat Index
Your risk of heat stroke rises sharply if the previous day was hot, according to a recent study by the U.S. Marine Corps. Researchers found that victims of heat-related illnesses often became dehydrated the day before they were stricken with heat stroke. “Being dehydrated not only prevents you from sweating efficiently, increasing your risk of overheating, but also causes your body to redirect blood from your muscles to your skin to aid cooling,” says David Martin, Ph.D., an exercise physiologist at Georgia State University and marathon development chair for USA Track & Field.
Mind the Water Temperature
If you’ve heard the old tale about drinking room-temperature water to stay cool, disregard it, say researchers at the University of Birmingham, in England. They found that cyclists who consumed 39°F beverages while exercising in hot weather were able to work out longer and harder than those who drank 66°F beverages.
Don’t Overhydrate
Gauge your body’s hourly sweat rate by weighing yourself before and after an hour workout (1 pint of sweat = 1 pound lost), says W. Larry Kenney, Ph.D., a Penn State University physiologist. Aim to replace only as much as you’ve sweat during every hour of exercise.
Find Good Cover
Ditch cotton T-shirts in favor of fabrics that wick away sweat, ventilate the body, and block the sun. “Sunburned pores are less efficient at releasing sweat,” says Martin. So curtail your exercise routine if you’re sunburned, because your skin will not thermoregulate well. Cotton tees have an SPF of 5, but sun-blocking fabrics, such as Under Armour’s Red Line T-shirt ($40, underarmour.com), offer protection of SPF 30, thanks to their microfiber fabric construction.
Precool Your Core
If you’re competing in any endurance events this summer, take a cue from the U.S. Olympic track-and-field team. When temperatures topped 104°F in Athens, the marathoners donned vests containing frozen gel sticks to cool their cores prior to competition. In doing so, they were able to race harder without overheating and won two of the six medals in the competition. We recommend the Arctic Heat Cooling Vest ($180, arcticheatusa.com).