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Haemodynamic changes after prolonged water immersion
Alain Boussuges1, Yoann Gole, Laurent Mourot
1Universite Aix-Marseilles II, Marseille, France.
Journal of Sports Sciences
|March 20, 2009
Summary
Prolonged thermoneutral water immersion causes significant fluid loss and lasting cardiovascular changes. Hemodynamic recovery takes longer than 16 hours, highlighting the need for improved fluid replacement strategies.
Area of Science:
- Physiology
- Cardiovascular Research
- Fluid Balance
Background:
- Thermoneutral water immersion impacts cardiac preload and neuroendocrine regulation of blood volume.
- Prolonged immersion can lead to substantial fluid loss (diuresis) and subsequent hemodynamic alterations.
Purpose of the Study:
- To investigate the prolonged hemodynamic effects of 6-hour thermoneutral water immersion.
- To assess cardiovascular status and blood volume regulation changes post-immersion.
Main Methods:
- Ten volunteers underwent 6 hours of thermoneutral water immersion.
- Doppler echocardiography assessed hemodynamic changes.
- Pulse wave velocity analysis estimated arterial wall distensibility.
Main Results:
- Significant weight loss (1.78 kg) and diuresis (1.5 L) occurred during immersion.
- Post-immersion, decreased cardiac chamber dimensions, lower stroke volume, and cardiac output were observed.
- Peripheral vasoconstriction and reduced lower limb blood flow persisted 16 hours post-immersion.
Conclusions:
- Hemodynamic parameters and vascular tone remained altered 16 hours after immersion.
- Fluid loss during immersion significantly impacts cardiovascular regulation.
- Fluid replacement protocols require optimization to enhance post-immersion recovery.
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