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The influence of hydration status on stress‐induced hemoconcentration
Author(s) -
Veldhuijzen Van Zanten Jet J.C.S.,
Thrall Graham,
Wasche Dean,
Carroll Douglas,
Ring Christopher
Publication year - 2005
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2005.00266.x
Subject(s) - hemoconcentration , hemodynamics , psychology , morning , mental stress , heart rate , mental arithmetic , stress (linguistics) , cardiology , medicine , blood pressure , psychiatry , hematocrit , linguistics , philosophy
This study examined the effects of hydration status on rheological and hemodynamic activity during rest, mental stress, postural stress, and combined mental/postural stress in 24 men when euhydrated and hyperhydrated. The stress tasks elicited hemoconcentration, although the effects were less pronounced during mental stress. Hyperhydration was associated with higher plasma volume throughout. All stress tasks also perturbed hemodynamic activity, irrespective of hydration status, with the exception of heart rate reactivity, which was attenuated when hyperhydrated. As expected the combined stress during euhydration was associated with an unfavorable rheological and cardiovascular profile, which may help explain the increased incidence of cardiovascular events in the morning.