Measuring Arterial Stiffness in a Head-Down Tilt Bed Rest Study: A Multisensor Approach^.

Area of Science:

• Cardiovascular Physiology
• Space Medicine
• Biomedical Engineering

Background:

• Arterial stiffness is a critical marker for vascular aging and cardiovascular disease risk.
• Spaceflight and simulated microgravity induce significant cardiovascular changes, but arterial stiffness alterations remain unclear.
• Understanding these changes is vital for astronaut health and developing countermeasures.

Purpose of the Study:

• To develop and validate a novel setup for measuring arterial stiffness during prolonged head-down tilt bed rest.
• To investigate the effects of simulated microgravity on arterial stiffness using combined biosignals and multiple measurement sites.
• To provide a reliable method for assessing cardiovascular alterations in simulated spaceflight environments.

Main Methods:

• Development of a specialized measurement setup integrating various biosignals and measurement locations.
• Determination of pulse transit times using synchronized pulse wave recordings.
• Application of the setup on male and female subjects during a head-down tilt bed rest study.
• Description and visualization of the complete setup, measurement protocols, and data analysis algorithms.

Main Results:

• Successful recording of baseline physiological signals prior to the bed rest period.
• Visualization of synchronized pulse wave recordings from different body locations.
• Demonstration of the setup's capability to capture dynamic arterial stiffness changes.
• Validation of the feasibility of the developed setup for bed rest studies.

Conclusions:

• The developed setup is feasible and effective for measuring arterial stiffness during prolonged head-down tilt bed rest.
• This methodology provides a valuable tool for studying cardiovascular adaptations to simulated microgravity.
• Further research using this setup can enhance our understanding of vascular aging in spaceflight.