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


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:11/12/2015)... BOSTON , Nov. 12, 2015  A golden ... for Duchenne muscular dystrophy (DMD) has provided a new ... Boston Children,s Hospital, the Broad Institute of MIT and ... Brazil . Cell, ... some dogs "escape" the disease,s effects. The Boston Children,s ...
(Date:11/10/2015)... 2015 About signature verification ... to identify and verify the identity of an ... the secure and accurate method of authentication and ... individual because each individual,s signature is highly unique. ... dynamic signature of an individual is compared and ...
(Date:10/29/2015)... , Oct. 29, 2015   MedNet Solutions ... the entire spectrum of clinical research, is pleased to ... High Tech Association (MHTA) as one of only three ... the "Software – Small and Growing" category. The Tekne Awards ... who have shown superior technology innovation and leadership. ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... ... ... Group announced the opening of a new core patient care hub with the opening ... facilities are part of GSCG’s expansion efforts in Latin America. , Both the Arica ... patients from around the world. , The clinics will be headed by Victor Perez, M.D. ...
(Date:11/30/2015)... December 1, 2015 Partnership includes an ... for the u niversity , s ... treatment s cale - up ...   Africa , where licensees based anywhere in the world ... SDN technology. --> Africa , where licensees based anywhere in ...
(Date:11/30/2015)... Epigenetics Corp. ("Zenith" or the "Company") today announced that it ... Board of Directors to replace Dr. Peter Johann . ... as co-founder of Resverlogix, with expertise in the fields of ... --> Dr. Wong remarked, "I am very excited to ... expertise in epigenetics and the advanced stage of the R&D ...
(Date:11/30/2015)... N.J. , Nov. 30, 2015  Champions Oncology, ... solutions and services to personalize the development and use ... , Chief Executive Officer, will be presenting at the ... at 4:30pm Pacific Standard Time (PST).  The conference, held ... Los Angeles, CA , will feature 200 ...
Breaking Biology Technology:
Cached News: