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:
*Name:
*Comment:
*Email:


(Date:4/13/2016)... physicians supporting Medicaid patients in Central Florida ... telehealth thanks to a new partnership with higi.   ... can routinely track key health measurements, such as blood ... they opt in, share them with IMPOWER clinicians through ... location at no cost. By leveraging this data, IMPOWER ...
(Date:3/29/2016)... , March 29, 2016 LegacyXChange, ... LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to announce ... used in a variety of writing instruments, ensuring athletes ... originally created collectibles from athletes on LegacyXChange will be ... of the DNA. Bill Bollander , ...
(Date:3/22/2016)... Ontario , PROVO and ... Newborn Screening Ontario (NSO), which operates the ... for molecular testing, and Tute Genomics and UNIConnect, ... management technology respectively, today announced the launch of a ... next-generation sequencing (NGS) testing panel. NSO ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016   Boston Biomedical ... novel compounds designed to target cancer stemness pathways, ... been granted Orphan Drug Designation from the U.S. ... of gastric cancer, including gastroesophageal junction (GEJ) cancer. ... designed to inhibit cancer stemness pathways by targeting ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... (Yeast and Mold) microbial test has received AOAC Research Institute approval 061601. , ... tests introduced last year,” stated Bob Salter, Vice President of Regulatory and Industrial ...
(Date:6/23/2016)... ... June 23, 2016 , ... Supplyframe, the ... the Supplyframe Design Lab . Located in Pasadena, Calif., the Design Lab’s ... how hardware projects are designed, built and brought to market. , The Design ...
(Date:6/23/2016)... NEWPORT BEACH, Calif. , June 23, 2016 /PRNewswire/ ... offering new biological discoveries to the medical community, has ... and co-founder Matthew Nunez . "We ... provide us with the capital we need to meet ... funding will essentially provide us the runway to complete ...
Breaking Biology Technology:
Cached News: