Why the study?
Does hyperhydration improve rheological and hemodynamic activity during stress compared to euhydration in men?
Does hyperhydration improve rheological and hemodynamic activity during stress compared to euhydration in men?
Hyperhydration attenuates heart rate reactivity and maintains higher plasma volume during stress, potentially mitigating unfavorable rheological and cardiovascular profiles.
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Hyperhydration may blunt acute hemodynamic stress responses; leaves open whether benefits extend to clinical outcomes or patient populations.
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.
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Zanten et al. (2005) studied this question.
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