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A new American Journal (July 2018) revealed that dehydration can affect cognitive function, with only a few hours of intense activity in the summer heat without drinking enough fluid to affect concentration.
Conducted by the Georgia Institute of Technology, the new meta-analysis examined 33 studies with 413 subjects in total and focused on the effects of acute dehydration on cognition, which everyone may experience during the course of the study. stress, heat and / or not drinking
The team found that functions, including attention, coordination and problem solving complex, suffered the most.
The results also showed that the majority of participants were committing more and more repetitive and unhelpful mistakes. a button
Activities such as responding quickly to the prompt also decreased, but not so much.
"The simplest reaction time tasks were" Even though dehydration has worsened, even though dehydration has worsened, tasks requiring attention have been greatly affected, "explains Mindy Millard. Stafford, Senior Investigator of the Study
"Maintain Focus in a Long Meeting."
"Higher order functions like doing maths or applying logic have also decreased. Researchers warned that dehydration could even increase the risk of an accident, for example, in situations that combine heavy perspiration and dangerous machinery.
As to when dehydration can occur produce and provoke these mental failures, the researchers say that there is no exact rule.
However, according to the studies included in the review observed a loss of body mass From 1% to 6% due to dehydration, it appears that more severe impairments start at 2% – a number also found in other related studies.
"There is already a lot of quantitative literature that if you lose 2% in the water, it affects physical abilities like muscle endurance or sports tasks, and your ability to regulate the temperature of your body. body, "said Millard-Stafford, adding," If you weigh 200 pounds (90.7 kg) and you are playing sports for a few hours, you drop four pounds (1.81 kg), and that's it. " is 2% body weight. "
" If you drop 4% or 5%, you're going to feel really bad, "she said. "Water is the most important nutrient."
However, she warned that you may have too much water. "Some people too aggressive, for fear of dehydration, drink so much water that they dilute their blood and their brain swells", which can, in extreme cases, lead to death.
She also added that although too much salt is bad for sedentary people or those who have hypertension, those who sweat a lot need salt to conserve water that they drink.
The results can be found published online in the journal Medicine and Science in Sports and Exercises . – AFP Relaxnews
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