Document Detail


No effect of 5% hypohydration on running economy of competitive runners at 23 degrees C.
MedLine Citation:
PMID:  17019298     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Although running economy (RE) is recognized as an integral component of successful endurance performance and is affected by numerous factors, little is known about the influence of body water loss on RE. This investigation examined the effects of hypohydration (HY) on RE and associated physiological responses. METHODS: Ten highly trained collegiate distance runners (mean +/- SD; age, 20 +/- 3 yr; height, 178.5 +/- 6.3 cm; body mass, 66.7 +/- 5.4 kg; VO2max, 66.5 +/- 4.1 mL x kg(-1) x min(-1)) participated in four experiments on separate days, twice in a euhydrated (EU) and twice in a HY state (-5.5 and -5.7% body mass loss achieved during 24 h). At each hydration level, subjects performed one 10-min treadmill run per day (23 degrees C environment), at either 70% VO2max (EU 70% or HY 70%) or 85% VO2max (EU 85% or HY 85%) in a randomized, repeated-measures design. Cardiopulmonary, metabolic, thermal, hormonal, and perceptual variables were measured. RESULTS: No between-treatment differences existed for RE (EU 70%, 46.3 +/- 3.2; HY 70%, 47.2 +/- 3.8; EU 85%, 58.6 +/- 2.8; HY 85%, 58.9 +/- 4.1 mL x kg(-1) x min(-1)), postexercise plasma lactate concentration (EU 70%, 1.9 +/- 0.6; HY 70%, 1.8 +/- 0.6; EU 85%, 6.5 +/- 3.5; HY 85%, 6.4 +/- 3.5 mmol x L(-1)), or rating of perceived exertion. HY resulted in a greater (P < 0.05 to 0.001) heart rate (HR), rectal temperature, and plasma norepinephrine concentration (NE), concurrent with reduced cardiac output, stroke volume, and respiratory exchange ratio. CONCLUSION: HY did not alter the RE or lactate accumulation of endurance athletes during 10 min of exercise at 70 and 85% VO2max. These findings indicate that HY had no effect on RE, but that it increased physiological strain in a 23 degrees C environment.
Authors:
Lawrence E Armstrong; Michael J Whittlesey; Douglas J Casa; Tabatha A Elliott; Stavros A Kavouras; Nicole R Keith; Carl M Maresh
Related Documents :
24836698 - Improved postural control in response to a 4-week balance training with partially unloa...
7226428 - Prediction of anaerobic capacity: a performance test employing an optimal exercise stress.
15045508 - The use of treadmill ergometers for extensive calculation of external work and leg stif...
17490458 - Is there an association between ppargc1a genotypes and endurance capacity in chinese men?
23982988 - Is the severity of knee osteoarthritis on mri associated with outcome of exercise therapy?
11410638 - Identification of higher brain centres that may encode the cardiorespiratory response t...
Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  38     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-10-04     Completed Date:  2006-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1762-9     Citation Subset:  IM; S    
Affiliation:
Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs, CT 06269-1110, USA. lawrence.armstrong@uconn.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Blood Circulation
Body Temperature
Body Water
Competitive Behavior / physiology*
Dehydration / physiopathology*
Exercise Test
Heart Rate / physiology*
Humans
Male
Norepinephrine
Oxygen Consumption / physiology
Physical Endurance / physiology*
Prospective Studies
Questionnaires
Running / physiology*
Time Factors
Chemical
Reg. No./Substance:
51-41-2/Norepinephrine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Aerobic influence on neuromuscular function and tolerance during passive hyperthermia.
Next Document:  Muscular performance after concentric and eccentric exercise in trained men.