It’s not an uncommon sight to see athletes and sports persons gulp down water and energy drinks to re-hydrate themselves and keep their performance levels intact, but a new research has debunked the long-standing unquestioned tenet that water loss hinders a competitor’s performance.
According to a research by scientists at Brock University by Stephen Cheung, a renowned kinesiologist, and published in Scandinavian Journal of Medicine and Science in Sports, loss of fluids doesn’t lead to impairment in an athlete’s performance.
The research involved 11 trained racing cyclists who wore IV drips while riding stationary bikes under competition-like conditions. Some cyclists had IV drips containing a saline solution to replenish fluids lost through sweat, but others had IV drips that were shams, providing no rehydration at all.
The cyclists were not told which type of IV drip they were wearing, and the researchers found there was virtually no difference in their performances. Cheung, himself a long-distance cyclist, is the Canada Research Chair in environmental ergonomics. His research team took an unprecedented approach in gauging the impacts of hydration on human resilience.
“We’re the first study to separate the conscious awareness of hydration status to truly test that by itself,” said Cheung. “This includes all the studies used to develop current hydration guidelines.”
“All existing studies manipulate hydration by giving or not giving water, so that manipulates both the physical state of hydration and also the perception of drinking and thirst. In other words, ‘I’m thirsty or upset that I don’t get to drink, so I’m not going to ride as hard.’
“What we’ve found was really novel. Even at up to three per cent body mass dehydration, no impairment was seen in exercise in the heat.”
Cheung said current guidelines repeatedly emphasize that athletes need to keep hydration within two per cent of body mass, or pay the price in terms of performance and health effects.
“We’ve just proven that it’s not so. This also supports why elite marathoners, even in the heat, rarely drink if at all.”
