HOME >> BIOLOGY >> NEWS
A water tale for all seasons: When it comes to hydration and exercise, the system works

Dehydration has minimal effect in cold, but cuts performance by 8% as temperature rises; the difference between a 2:30 and a 2:42 marathon

Common sense" tips on hydration

BETHESDA, Md. (Sept. 4, 2005) For over 20 years, the U.S. Army Research Institute of Environmental Medicine has studied the effect of temperature and the environment on physical performance. According to Michael Sawka, chief of USARIEM's Thermal and Mountain Medicine Division, "we're filling in the data gaps regarding the interaction of temperature and hydration on physical performance so we can set guidelines to optimize results relevant not just to soldiers or navy divers, but to athletes, firefighters and hunters anyone who's in extreme environments without access to food or water for long periods."

Several recent USARIEM studies in the Journal of Applied Physiology describe experiments in both warm and cold temperatures. One report showed that dehydration reduces physical performance, in this case cycling, 8% in temperate/cool air (68 degrees Fahrenheit), but only 3% in a cold 36 degrees F. Furthermore it found that cold weather itself had an insignificant impact on physical performance, irrespective of hydration level.

A second USARIEM-generated study found that ingesting glycerol, a sweetish syrup, was an effective hyperhydration agent, causing "nearly twice as much fluid" to be retained after four hours of cold-air exposure (CAE) compared with water ingestion alone. "This study also demonstrates that hyperhydration doesn't modify cardiovascular or thermoregulatory responses during resting CAE," the reported added.

How glycerol may hold water 'in reserve' in body for use later

The implications of the second study are particularly interesting for prolonged outdoor exposure when rehydration is not possible. "Because glycerol is freely distributed in body water, hyperhydration with GI (glycerol ingesti
'"/>


2-Sep-2005


Page: 1 2 3 4

Related biology news :

1. New system of wastewater treatment could reduce the size of treatment plants by half
2. Space-borne sensors help Africa tackle water shortage problems
3. Chickens dieting to help Delaware waterways
4. New aerogels could clean contaminated water, purify hydrogen for fuel cells
5. Seawater intrusion is the first cause of contamination of coastal aquifers
6. Study finds contaminated water reaching Floridas offshore keys
7. Alternative farming cleans up water
8. Masquerading in murky waters
9. The origin of perennial water-ice at the South Pole of Mars
10. Loss of hemlocks will affect water dynamics in southern Appalachian forests
11. Biocontrol of invasive water hyacinth contributes to socioeconomic and health improvements in Africa

Post Your Comments:
(Date:11/7/2014)... Dr. Debra Auguste, associate professor, biomedical engineering, in ... College of New York, have identified a molecule ... of the most aggressive forms of breast cancer. ... high mortality rate owing to aggressive proliferation and ... However, Professor Auguste,s team, discovered the overexpression of ...
(Date:11/7/2014)... 2014 Leading Biometric companies aim to ... revolutionizing online transactions.  Companies in focus today are: NXT-ID, Inc. ... BABA ), Google Inc. (NASDAQ: GOOG ), ... EBAY ) and MasterCard Inc. (NYSE: MA) ... a biometric authentication company focused on the growing mobile commerce ...
(Date:11/6/2014)... because of metastasis, yet progress in preventing and ... "It,s been particularly challenging to design drugs that ... in systems biology at Harvard Medical School. ... they,ve already metastasized." , Gujral and colleagues have ... researchers better understand how metastasis begins. Their findings ...
Breaking Biology News(10 mins):Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 2Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 3Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 4Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 5Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 6Migration negation 2Migration negation 3
(Date:11/21/2014)... November 21, 2014 , ...   Mariano Rodríguez es elegid vicepresidente senior ... KLOX está en marcha para comenzar de forma rápida ... heridas de reciente aprobación en Europa   , ... complace al anunciar los siguientes nombramientos: Todd ...
(Date:11/21/2014)... Los Angeles, CA (PRWEB) November 20, 2014 ... “A Short Walk to the Other Side” ... was an “Award-Winning Finalist in the “Fiction: Short Story” ... . , Jeffrey Keen, President and CEO of USA ... entries from mainstream and independent publishers, including Simon & ...
(Date:11/21/2014)... 20, 2014 BlueInGreen, LLC ( ... LLC (Pinnacle), and PCI, Inc., leading suppliers of ... have been selected to provide a new state-of-the-art ... Paul R. Noland Wastewater Treatment. The new ... HyDOZ® gas dissolution technology, Pinnacle Ozone’s industry ...
(Date:11/21/2014)... , Nov. 20, 2014 Polaris Group ... dosed in its Phase 1 trial of ADI-PEG ... the treatment of malignant pleural mesothelioma (MPM) and ... conducting clinical trials on ADI-PEG 20, both as ... the treatment of several other indications, including breast ...
Breaking Biology Technology:KLOX Technologies anuncia sus nombramientos ejecutivos 2KLOX Technologies anuncia sus nombramientos ejecutivos 3KLOX Technologies anuncia sus nombramientos ejecutivos 4KLOX Technologies anuncia sus nombramientos ejecutivos 5Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 2Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 3Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 4City of Fayetteville Leads Nation with Innovative Ozone Technology 2City of Fayetteville Leads Nation with Innovative Ozone Technology 3City of Fayetteville Leads Nation with Innovative Ozone Technology 4Polaris Group Announces Treatment of First Patient in Phase 1 Study of ADI-PEG 20 plus Pemetrexed and Cisplatin in Malignant Pleural Mesothelioma And Non-Squamous Non-Small Cell Lung Carcinoma 2
Cached News: