Document Detail

Intracellular hyperhydration induced by a 7-day endurance race.
MedLine Citation:
PMID:  10483806     Owner:  NLM     Status:  MEDLINE    
To test the hypothesis that a chronic expansion of extracellular water (ECW), usually observed during prolonged endurance exercise, is associated with an increase in intracellular water space (ICW), total body water (TBW) and ECW were estimated before (within a week, day C-7) and after (on the 1st day of recovery, R + 1) a competition lasting 7 consecutive days in nine healthy sportsmen. The competition involved running, cycling and cross-country skiing over 620 km. Between days C-7 and R + 1, the following increases occurred - mean TBW by 4.2 (SEM 1.1) l (i.e. +10%, P = 0.01, bioelectrical impedance analysis, BIA, at 100 kHz) and by 4.1 (SEM 0.7) l (P = 0.01, dilution of 18O); mean ECW by 2.2 (SEM 0.5) l (i.e. +14%, P = 0.01, BIA at 5 kHz), and mean plasma volume (PV) by 0.7 (SEM 0.1) l (i.e. +22%, Evans blue dye dilution, P = 0.008). Consequently, mean ICW had been expanded by 2.1 (SEM 0.6) l (i.e. +8%, P = 0.01). The intensity of daily exercise evaluated from recordings of heart rate varied between 49.0% to 57.8% of maximal oxygen consumption VO2max. Water retention was highly correlated with relative exercise intensity VO2max (ICW, r = 0.86; ECW, r = 0.93; TBW, r = 0.94). Total mean plasma content of sodium increased by 104 (SEM 17) mmol (P = 0.008) while albumin and total protein contents were unchanged. We concluded that prolonged and repeated exercise induced a chronic hyperhydration at both extracellular and intracellular levels, which was related to exercise intensity. Sodium retention was the major factor in the increase of PV.
N Fellmann; P Ritz; J Ribeyre; B Beaufrère; M Delaître; J Coudert
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  80     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-10-19     Completed Date:  1999-10-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  353-9     Citation Subset:  IM    
Laboratoire de Physiologie - Biologie du Sport, Faculté de Médecine, Clermont-Ferrand, France.
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MeSH Terms
Bicycling / physiology*
Body Fluid Compartments / physiology
Body Water / physiology
Electric Impedance
Energy Metabolism / physiology
Extracellular Space / physiology
Heart Rate / physiology
Intracellular Fluid / physiology*
Oxygen Consumption / physiology
Oxygen Isotopes
Physical Endurance / physiology*
Plasma Volume / physiology
Reg. No./Substance:
0/Oxygen Isotopes

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

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