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:7/29/2014)... UK overseas territory of Ascension Island, one of the ... a renaissance. , Writing in the journal Biodiversity ... and Ascension Island Government Conservation Department report that the ... Atlantic outpost has increased by more than 500 per ... as 24,000 nests are now estimated to be laid ...
(Date:7/29/2014)... Schools of Dentistry (UM SOD) and Medicine (UM ... a five-year $10.7 million grant award from the ... of the National Institutes of Health to study ... (STDs). The grant, which renews a previous $12 ... direction for the research by studying chlamydial and ...
(Date:7/29/2014)... for parents of preterm babies latest research from the ... they become teenagers, the brains of many preterm children can ... A study conducted by the University,s Robinson Research Institute ... experiences no brain injury in early life, their cognitive abilities ... term-born peers. , However, the results of the study, published ...
Breaking Biology News(10 mins):Major turtle nesting beaches protected in 1 of the UK's far flung overseas territories 2University of Maryland Schools of Dentistry and Medicine receive NIH grant 2University of Maryland Schools of Dentistry and Medicine receive NIH grant 3University of Maryland Schools of Dentistry and Medicine receive NIH grant 4Preterm children's brains can catch up years later 2
(Date:7/29/2014)... 2014 “PharmaSphere: Emerging Biotech Investment ... Capital Funding” report provides in-depth analysis of the ... and venture capital segments of the financial industry, ... have significant impact on the future of emerging ... the report identifies regions of the world that ...
(Date:7/29/2014)... 2014 Human Longevity, Inc. (HLI), a genomics ... extending the healthy, high performance human life span, today ... an expert in machine learning and machine translation as ... from Google where he was Distinguished Research Scientist and ... to HLI Co-Founder and CEO, J. Craig Venter ...
(Date:7/29/2014)... July 29, 2014  The Society for Clinical ... updated program for the 9 th annual ... in Amelia Island , Florida.  The focus ... remains unchanged, however, the topics and format will ... opportunity among all stakeholders with a continued focus ...
(Date:7/29/2014)... , July 29, 2014  Discovery Laboratories, Inc. ... advancing a new standard of respiratory critical care, will ... August 5, 2014 before the open of the ... will host a live teleconference and webcast at ... conference call, Discovery Labs, management will discuss the ...
Breaking Biology Technology:Strategic Trends of Biotech Investment Industry (Private Equity and Venture Capital Funding) in New Report Available at MarketOptimizer.org 2Strategic Trends of Biotech Investment Industry (Private Equity and Venture Capital Funding) in New Report Available at MarketOptimizer.org 3Strategic Trends of Biotech Investment Industry (Private Equity and Venture Capital Funding) in New Report Available at MarketOptimizer.org 4Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 2Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 3TransCelerate, Lilly, Pfizer, and FDA Highlight Collaborative Program at the Site Solutions Summit 2TransCelerate, Lilly, Pfizer, and FDA Highlight Collaborative Program at the Site Solutions Summit 3Discovery Labs to Report 2014 Second Quarter Financial Results and Hold Conference Call on Tuesday, August 5, 2014 at 9:00 a.m. Eastern Time 2
Cached News: