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[Effects of hydrostatic pressure on cardiac function in human]
[Hokkaido Igaku Zasshi] the Hokkaido Journal of Medical Science
|January 1, 1987
Summary
Hydrostatic pressure from water immersion significantly increases cardiac output and left ventricular volume. Abdominal circumference reduction correlates with these cardiac function changes.
Area of Science:
- Cardiovascular Physiology
- Environmental Physiology
Context:
- Hydrostatic pressure effects on human physiology are crucial for understanding immersion responses.
- Previous research has explored cardiovascular adaptations to immersion, but detailed cardiac function changes under pressure require further investigation.
Purpose:
- To investigate the impact of hydrostatic pressure during head-out water immersion on cardiac function.
- To quantify changes in left ventricular volume, cardiac output, and heart rate.
- To explore the relationship between abdominal circumference and cardiac parameters.
Summary:
- Echocardiography and radiography revealed significant increases in end-diastolic left ventricular volume (213%), end-systolic volume (193%), and cardiac output (220%) during water immersion compared to air.
- These changes occurred without significant alterations in heart rate.
- A significant decrease in abdominal circumference (94.4%) was observed, correlating with increased end-systolic left ventricular volume.
Impact:
- Findings demonstrate that hydrostatic pressure profoundly influences cardiac mechanics, leading to enhanced cardiac output.
- The study highlights the physiological adaptations to immersion, relevant for divers, astronauts, and patients undergoing hydrotherapy.
- Understanding these pressure-induced cardiovascular shifts is vital for optimizing human performance and safety in aquatic or simulated environments.