Document Detail

The effects of progressive dehydration on strength and power: is there a dose response?
MedLine Citation:
PMID:  19908058     Owner:  NLM     Status:  MEDLINE    
This study examined the effect of exercise- and heat-induced dehydration on strength, jump capacity and neuromuscular function. Twelve recreationally active males completed six resistance exercise bouts (baseline and after each 5 exposure sessions) in an increasing state of hypohydration obtained by repeated heat exposure and exercise sessions (5 periods of 20 min jogging at up to approximately 80% age predicted heart rate maximum at 48.5 +/- 0.48 degrees C, relative humidity 50 +/- 4%). Relative to starting values, body mass decreased 1.0 +/- 0.5, 1.9 +/- 0.7, 2.6 +/- 0.8, 3.3 +/- 0.9 and 3.9 +/- 1.0% after exposure 1, 2, 3, 4 and 5, respectively. However, plasma volume remained constant. No significant differences existed amongst trials in vertical jump height, electromyography data or isokinetic leg extension at a rate of 120 degrees s(-1). Isometric leg extensions were significantly reduced (P < 0.05) after the first (1% body mass loss) and subsequent exposures in comparison to baseline. Isokinetic leg extensions at a rate of 30 degrees s(-1) were significantly reduced after the third (2.6% body mass loss) and subsequent exposures compared with baseline. No dose response was identified in any of the tested variables yet a threshold was observed in isometric and isokinetic strength at 30 degrees s(-1). In conclusion, dehydration caused by jogging in the heat had no effect on vertical jumping or isokinetic leg extensions at a rate of 120 degrees s(-1). Alternatively, exercise-induced dehydration was detrimental to isometric and isokinetic leg extensions at a rate of 30 degrees s(-1), suggesting the force-velocity relationship in hypohydration merits further research.
Lawrence D Hayes; Christopher I Morse
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Publication Detail:
Type:  Clinical Trial; Journal Article     Date:  2009-11-12
Journal Detail:
Title:  European journal of applied physiology     Volume:  108     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-15     Completed Date:  2010-04-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  701-7     Citation Subset:  IM    
Department of Exercise and Sports Science, Manchester Metropolitan University, Hassall Road, Alsager, ST7 2HL, UK.
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MeSH Terms
Body Water / physiology
Dehydration / physiopathology*
Dose-Response Relationship, Drug
Exercise Test
Muscle Fatigue / physiology
Muscle Strength / drug effects,  physiology*
Physical Endurance / drug effects,  physiology
Plasma Volume / physiology
Sweating / physiology
Time Factors
Water / pharmacology*,  physiology
Young Adult
Reg. No./Substance:

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

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