"Earlier this year, I went for the kind of morning run where the sun beats down on your back the entire way. Every step was an effort, and even the air felt thick to breathe. By the time I got to the bottom of my road, five miles later, I was seeing black spots in front of my eyes and fighting a sudden urge to vomit. Luckily, I made it home without throwing up, downed a bottle of water and eventually cooled down."
"When it comes to working out in the heat, you'd think I would've learned my lesson. Alas, no. A couple weeks later, I cycled two miles to my bouldering gym. After a warm-up, I began to climb. Almost immediately I felt dizzy, with a numb sensation down my right arm. Worse, my mouth and face felt numb and I was having trouble remembering words."
"What Do We Mean by "Heat Tolerance"? Heat tolerance doesn't just apply to your ability to sweat it out on the subway in July, or how long you can last in a sauna. In performance science, a growing number of experts already believe that your ability to deal with heat - both external heat and the heat generated by the body during exercise - might be the key to unlocking the next level of your fitness abilities."
Episodes of dizziness, visual disturbance, nausea, numbness, and cognitive impairment can result from heat exposure and dehydration during exercise. Exercise generates internal heat that must be dissipated through sweating, circulation, and cooling mechanisms to avoid overload. Heat tolerance covers the capacity to manage both environmental heat and heat produced by the body, and directly influences performance and safety. Hydration, planned breaks, cooling strategies, graded acclimatization, and cautious pacing help maintain training quality and reduce the risk of heat-related illness as temperatures increase globally.
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