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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Cardiovascular deconditioning during long-term spaceflight through multiscale modeling.

Caterina Gallo1, Luca Ridolfi2, Stefania Scarsoglio1

  • 1Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Torino, Italy.

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Spaceflight causes cardiovascular deconditioning, reducing exercise tolerance and altering nutrient supply. Understanding these changes is crucial for astronaut safety and may offer insights into aging on Earth.

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Area of Science:

  • Cardiovascular physiology
  • Space medicine
  • Computational biology

Background:

  • Human spaceflight necessitates understanding physiological adaptations to microgravity.
  • Cardiovascular deconditioning, characterized by hemodynamic changes, is a significant concern for astronaut health and performance.
  • Existing data on microgravity-induced cardiovascular changes are incomplete and inconsistent.

Purpose of the Study:

  • To computationally model and analyze cardiovascular responses to long-term microgravity exposure.
  • To compare the physiological effects of 0G spaceflight with a 1G supine condition.
  • To identify specific hemodynamic alterations and their impact on astronaut health and exercise capacity.

Main Methods:

  • Development and validation of a 1D-0D multiscale computational model.
  • Simulation of cardiovascular system dynamics during sustained microgravity (0G) exposure.
  • Comparison of simulated 0G responses against a 1G supine reference condition.

Main Results:

  • Reduced cardiac work, oxygen consumption, contractility, and central pressures in 0G, indicating deconditioning.
  • Simulated exercise tolerance in spaceflight conditions was comparable to an untrained sedentary individual.
  • Significant alterations in capillary-venous waveforms were observed, potentially affecting cellular nutrient supply.

Conclusions:

  • Spaceflight significantly impacts cardiovascular function, reducing physical capacity and altering physiological parameters.
  • The findings highlight the need for countermeasures to mitigate deconditioning for future long-duration missions, especially for Moon/Mars landings.
  • Studying microgravity deconditioning offers valuable insights into aging physiology on Earth due to shared mechanisms.