Dehydration occurs when the body does not have enough water and this can happen rapidly in extreme heat or through exercise. Symptoms of dehydration can include headaches, lethargy and hallucinations. In extreme cases, dehydration may result in death.
Florey researchers Dr Michael Farrell, A/Prof Gary Egan and Prof Derek Denton discovered that a region in the brain called the mid cingulate cortex predicts how much water a person needs, but this region malfunctions in older people.
Dr Farrell said they infused old (age 65 to 74) and young (age 21 to 30) research participants with salty water to make them thirsty and then allowed them to drink as much water as they wanted.
“Although all participants had the same level of thirst, the older people only drank half as much water as the younger subjects,” Dr Farrell said.
“Using PET imaging we found in the older people, the mid cingulate cortex was ‘turned off’ much earlier by drinking small volumes.”
“This discovery helps explain why the elderly can become easily dehydrated,” he said.
The August 2003 European heatwave claimed around 52,000 lives through dehydration and other causes* – many of these were older people. France suffered the worst losses, with 14,802 people dying from the heatwave.
As climate change continues to be a hot global issue, the health implications for the elderly from rising summer temperatures add to this concern.
Dr Farrell recommended that older people ensure they drink enough water during hot weather.
“Adults should drink about eight glasses of water per day to prevent dehydration, and physically active people may need to drink more,” Dr Farrell said.
Second cause of hidden hearing loss identified
20.02.2017 | Michigan Medicine - University of Michigan
Prospect for more effective treatment of nerve pain
20.02.2017 | Universität Zürich
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
20.02.2017 | Materials Sciences
20.02.2017 | Health and Medicine
20.02.2017 | Health and Medicine