Document Detail

Influence of acute fluid loading on stress-induced hemoconcentration and cardiovascular reactivity.
MedLine Citation:
PMID:  18607711     Owner:  NLM     Status:  MEDLINE    
The goal of this study was to assess the possible attenuating effects of oral fluid loading on hematological and hemodynamic factors during acute psychological stress in two separate experiments: Experiment 1 assessed the effects of hypotonic fluid loading (water) and Experiment 2 assessed the effects of isotonic fluid loading (Gatorade). Twenty-eight participants were recruited for Experiment 1, and 28 participants were recruited for Experiment 2. Participants for each experiment completed two test sessions, once in a hypo-hydrated condition (following 12-h fast) and once in a fluid loaded condition (hypotonic or isotonic fluid). During each session, hematocrit (Hct), hemoglobin (Hgb), calculated plasma volume (CPV), heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), cardiac output (CO), stroke volume (SV), and total peripheral resistance (TPR) were assessed during a 10-min resting baseline period, 6-min mental arithmetic (MA) task, and a 16-min recovery period. Results for Experiment 1 revealed that the fluid load condition Hct, Hgb, and HR levels were significantly lower in comparison to the hypo-hydration condition, and that Hct, Hgb, and CPV reactivity was greater during the fluid load condition. Results for Experiment 2 revealed that Hct, Hgb, and TPR were lower and CPV, SBP, SV, and CO were higher during the fluid load condition compared to the hypo-hydration condition and that HR, CO, and TPR reactivity was greater during the fluid load condition. Finally, analytic comparisons between the two fluid types revealed that SV and CO levels were significantly greater at baseline and during MA when isotonic fluid was ingested compared to hypotonic fluid ingestion.
Stephen M Patterson; Melissa M VanderKaay; Birgit A Shanholtzer; Cornelia A Patterson
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-08
Journal Detail:
Title:  Journal of behavioral medicine     Volume:  31     ISSN:  0160-7715     ISO Abbreviation:  J Behav Med     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-28     Completed Date:  2008-12-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807105     Medline TA:  J Behav Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  319-30     Citation Subset:  IM    
Ohio University, Athens, OH, USA.
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MeSH Terms
Blood Pressure / physiology
Blood Viscosity / physiology*
Blood Volume / physiology*
Cardiac Output / physiology
Drinking / physiology*
Fluid Therapy / methods*
Heart Rate / physiology
Hemodynamics / physiology*
Isotonic Solutions / administration & dosage
Problem Solving / physiology
Stress, Psychological / physiopathology*
Vascular Resistance
Water-Electrolyte Balance / physiology
Young Adult
Reg. No./Substance:
0/Isotonic Solutions; 0/gatorade

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

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