In the 1904 Olympic Gamesthe organizers wanted to demonstrate that drinking little water improved performance. What they did was design a marathon with just one official hydration point under 32 degrees. The experiment ended with runners collapsing, hallucinations and one of the winners crossing the finish line practically supported. More than a century later, the heat continues to remind us of the same lesson: sweating is not strength, it is survival.
The great myth of summer. Every summer comes back the same image: Soaked runners, tight t-shirts, and the feeling that the more you sweat, the more you’re getting out of your workout. It turns out that physiology says otherwise. Sweating a lot is not a medal or an exact measure of effort.
In the New York Times the physiologist Mindy Millard-Stafford it summarize clearly: “You can’t compare one person’s sweat rate to another’s and say that person worked harder.” The amount of sweat has more to do with genetics, environment and adaptation than with pure performance. The bad news for the summer myth is simple: ending up dripping does not mean training better.
Sweat is survival, not performance. The first thing to understand is what sweat actually does. The sports doctor Michael Fredericson He recalled that “it is the body’s way of keeping the temperature under control.”
It is not extra energy leaving the body or a sign of increased calorie burning. It is a mechanism thermal emergency. When the heat is on or the exercise increases in intensity, the brain activates the sweat glands to cool the machine. What appears to be a power signal is actually a regulation signal.
Not everyone sweats the same. Here is one of the keys that dismantles many comparisons. Two people can do the exact same workout and end up in radically different states. In this regard, Fredericson I insisted on the middle: “Even among serious athletes, no two people sweat the same.”
Humidity, wind, sun, clothing and even salt concentration completely change the equation. You can sweat more in a closed, humid class than in a tough outdoor outing, and that doesn’t mean the effort was greater. It means that the environment is demanding more cooling.
Adaptation also changes the body. The body learns. Those who train constantly in the heat begin to sweat earlier, more distributed and more efficiently. The physiologist W. Larry Kenney explains that with acclimatization the glands produce a more diluted sweat and that it evaporates better.
Put another way, that means that an adapted athlete may appear to be sweating more, but they are actually functioning better. Sweat, therefore, not only does not measure intensity: sometimes measures biological experience.
The point where the body begins to pay. The problem begins when that cooling costs too much. With intense heat you can lose more than one liter of liquid per hour and, in long sessions, between 2% and 6% of body weight.
That 2% is an important threshold, because there both physical performance and cognitive ability. It’s no longer just tiredness; It is worse decision making, less coordination and more cardiovascular risk. Sweat stops being an ally and begins to become a bill.
The metric that really matters. If sweat is not useful for measuring intensity, you have to look at something else: heart rate. The sports cardiologist Sean Swearingen Remember that it is a much more reliable indicator and that, with heat, it triggers sooner. The recommendation is simple but clearly uncomfortable: maintain regular heartbeats, even if this forces you to slow down or reduce distance.
In fact, that’s when the phrase comes that condenses everything. Millard-Stafford He tells it bluntly: “Leave your ego at the door and be prepared to start slower.” That may be the real lesson of the summer: training better often means accepting that there are days when going slower is exactly the right thing to do.
Image | Wikimedia, NARA
In Xataka | Longevity experts are clear: “120 minutes of strength per week is associated with lower mortality”
GIPHY App Key not set. Please check settings