Skip to content

Fitness & Exercise

Heat Can Beat the Best Athlete

If exercising in hot weather leaves you confused, weak, and headachy, you're suffering heat stroke and need immediate help. And then there's the smog. ...
Font Size
A
A
A

WebMD Feature

In Phoenix, locals call it a "cold snap" when the thermometer drops below 105 degrees. After spending time at a construction site, Arizona builder Albert Ayala found his head swimming and noticed he had stopped sweating. "I felt terrible," he recalls. He went home and a couple of hours later, experienced fierce muscle cramps. "I thought I knew heat," he says, "but it got me."

"It can happen to anyone," says Andrea M. McCauley, director of communication for the American Red Cross in the Phoenix area. Although becoming acclimated gradually to heat helps (in Phoenix, they say if you can get through one summer, you won't notice the heat as much), acclimation is not the whole answer.

How Hot Is Hot?

"When should you worry about exercising in the heat?" asks William O. Roberts, MD, a sports medicine specialist with MinnHealth in White Bear Lake, Minn., (not in a desert, notice -- this can happen anywhere). "That's a moving target. A lot depends on the humidity. With no acclimation, 70 degrees with high humidity can be dangerous. Your sweat can't evaporate."

Heat, Roberts repeats, is not something you can instinctively gauge. "People often don't realize how hot and humid it is until they are already in trouble."

If the body cannot carry the heat given off by exercising muscles to the surface of the body fast enough -- and once it's there, if the surrounding air is not cooler or evaporating sweat does not cool the body-- one's innards literally stew, destroying and shutting down organ systems. It's not a matter of discipline or will, it's a matter of heat exchange -- physics and physiology, not physical endurance.

1 | 2 | 3

Healthy Living Tools

Ditch Those Inches

Set goals, tally calorie intake, track workouts and more, all via WebMD’s free Food & Fitness Planner.

Get Started

Today on WebMD

pilates instructor
15 moves that get results.
woman stretching before exercise
How and when to do it.
 
couple working out
Moves you can do at home.
woman exercising
Strengthen your core with these moves.
 
man exercising
Article
7 most effective exercises
Interactive
 
Man looking at watch before workout
Slideshow
Overweight man sitting on park bench
Video
 

Pollen counts, treatment tips, and more.

It's nothing to sneeze at.

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

pilates instructor
Slideshow
jogger running among flowering plants
Video
 
woman walking
Article
Taylor Lautner
Article