Dehydration can lower cognitive abilities: Study

first_imgWashington, Jul 21 (PTI) Just two hours of vigorous work in the summer sun without drinking fluids could be enough to blunt concentration, say scientists who found that cognitive functions often deteriorate as the body gets dehydrated. Researchers at the Georgia Institute of Technology in the US analysed data from multiple research papers on dehydration and cognitive ability. The data pointed to functions like attention, coordination and complex problem solving suffering the most, and activities like reacting quickly when prompted not diminishing much. “The simplest reaction time tasks were least impacted, even as dehydration got worse, but tasks that require attention were quite impacted,” said Mindy Millard-Stafford, a professor at Georgia Tech. As the bodies of test subjects in various studies lost water, the majority of participants increasingly made errors during attention-related tasks that were mostly repetitive and unexciting, such as punching a button in varying patterns for quite a few minutes. There are situations in life that challenge attentiveness in a similar manner, and when it lapses, snafus can happen. “Maintaining focus in a long meeting, driving a car, a monotonous job in a hot factory that requires you to stay alert are some of them,” said Millard-Stafford, a principal investigator of the study published in the journal Medicine & Science in Sports & Exercise. “Higher-order functions like doing math or applying logic also dropped off,” said Millard-Stafford. The researchers have been concerned that dehydration could raise the risk of an accident, particularly in scenarios that combine heavy sweating and dangerous machinery or military hardware.advertisement There’s no hard and fast rule about when exactly such lapses can pop up, but the researchers examined studies with one to six per cent loss of body mass due to dehydration and found more severe impairments started at two per cent. That level has been a significant benchmark in related studies.”There’s already a lot of quantitative documentation that if you lose 2 percent in water it affects physical abilities like muscle endurance or sports tasks and your ability to regulate your body temperature,” said Millard-Stafford. “We wanted to see if that was similar for cognitive function,” she said.The researchers looked at 6,591 relevant studies for their comparison, then narrowed them down to 33 papers with scientific criteria and data comparable enough to do metadata analysis. They focused on acute dehydration, which anyone could experience during exertion, heat and/or not drinking as opposed to chronic dehydration, which can be caused by a disease or disorder.”If you weigh 200 pounds and you go work out for a few of hours, you drop four pounds, and that’s 2 per cent body mass,” Millard-Stafford said. “With an hour of moderately intense activity, with a temperature in the mid-80s, and moderate humidity, it’s not uncommon to lose a little over 2 pounds of water,” she said.”If you do 12-hour fluid restriction, nothing by mouth, for medical tests, you’ll go down about 1.5 per cent. Twenty-four hours fluid restriction takes most people about 3 per cent down,” she said. Older people can dry out more easily because they often lose their sensation of thirst and also, their kidneys are less able to concentrate urine, which makes them retain less fluid. People with high body fat content also have lower relative water reserves than lean folks. PTI MHN MRJMRJlast_img read more

Justin Langer in awe of Virat Kohli, MS Dhoni after India win Adelaide ODI

first_imgBrief Scores: India (299/4; Kohli 104, Dhoni 55 not out) beat Australia (298/9; Marsh 131, Maxwell 48, Bhuvneshwar 4 for 45) by 6 wickets. Full ScorecardAustralia coach Justin Langer has showered praise on Virat Kohli and compared him with Sachin Tendulkar after the India skipper led from the front to help his side win the second ODI by 5 wickets. Langer also said Virat Kohli’s balance while playing 360 degree shots in all formats of the game is “unbelievable”. Virat Kohli scored 104 while MS Dhoni remained unbeaten on 55 as India chased down 299 in the second ODI of a three-match series at the Adelaide Oval on Tuesday. The series is now locked at 1-1, with the third and final ODI to be played in Melbourne on Friday.”I would like to have them both in my team. Sachin was an incredible cricketer. I used to watch him and it was like he was meditating. He was so calm and that’s why his record is peerless,” Langer said after Australia’s six-wicket loss in the second ODI here.”Virat is doing the same thing. He is so calm and so competitive, and technically his balance is unbelievable. For him to play 360-degree shots in all formats of the game, his balance is unbelievable.”Langer said it is a blessing in disguise for the young Australian cricketers to play against class players like Kohli and Dhoni.”He (Kohli) is a great competitor and his concentration is extra ordinary and for someone to make so many runs as he has it is incredible like all the great players,” he said.advertisement”Sachin and Virat, and MS Dhoni, who averages 50-plus in 340 games, they are all-time great players and our guys are in the best seats at the moment, playing some of the best all-time great ODI players and they will be better from the experience,” Langer added.AMAZING EXPERIENCEDhoni slammed an unbeaten 55 off 54 balls after Kohli laid the foundation for India’s series-levelling victory in the second ODI with a fluent 104.Langer said the inexperience of his side showed as first Kohli marshalled the middle overs and then Dhoni turned back time to finish the chase with four balls to spare.”We were playing against three all-time great one-day international players [also referring to Rohit Sharma at the SCG]. We saw it in the first one, and class always comes to the top, and we have seen that with India so we must respect that,” he said.”The way Virat and MS batted today, you hate losing but when you see that – it’s amazing. That’s why they are such great players so we will gain great experience from it.”In big tournaments like the World Cup, I like to see our guys under pressure like they were tonight so it will be much better for the experience. And it’s still one-all in the series, and it means it’s alive and well. The MCG game is going to be huge, and we can’t wait for that,” he added.Shaun Marsh’s seventh ODI hundred helped Australia set up a tall score of 289 for 9, but India overcame easily riding on the experience of Kohli and Dhoni.’BRILLIANT MARSH’Langer was full of praise for Marsh, who has been Australia’s best ODI batsman in recent times.”I thought Shaun Marsh’s innings was absolutely brilliant. We had some good 50-run partnerships but we talked about getting big hundreds, Shaun did that.”We probably lost those two wickets just at the end with Shaun and Glenn Maxwell getting out just at the end. It might have cots us 15 or so runs which obviously in the context of this game it would have been handy,” said Langer.”He’s turning into a great one-day international player, four hundreds in eight games. You’d like to see him get hundreds and win. It would have been a perfect day for him,” he signed off.Also Read | MS Dhoni not getting younger, leave the man alone: Sunil GavaskarAlso Read | MS Dhoni has done this for years: Dinesh Karthik on match-winning stand in AdelaideAlso Read | It was an MS Dhoni classic, hats off to him: Virat Kohli after Adelaide winAlso Read | MS Dhoni overtakes Virat Kohli for highest average in successful run chaseslast_img read more