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Centrifugation

Centrifugation

Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...

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Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

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Centrifugation protocol for the NASA Artificial Gravity-Bed Rest Pilot Study.

Maneesh Arya¹, William H Paloski, Laurence R Young

¹Wyle Life Sciences, 1290 Hercules, Houston, TX 77058, USA. maneesh.arya-1@nasa.gov

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology

|April 1, 2008

Summary

Artificial gravity loading via short radius centrifuge effectively mitigated negative physiological effects of prolonged bed rest in human subjects. This study details the protocol development for artificial gravity countermeasures.

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Area of Science:

Space Medicine
Human Physiology
Biomedical Engineering

Background:

Prolonged bed rest leads to deconditioning, including cardiovascular and musculoskeletal decline.
Artificial gravity is a potential countermeasure for spaceflight-induced deconditioning.

Purpose of the Study:

To investigate the efficacy of daily artificial gravity loading using a short radius centrifuge.
To assess the physiological effects of artificial gravity on bed rest deconditioned subjects.

Main Methods:

A 41-day ground-based study involving 21 days of 6-degree head-down bed rest.
Treatment group received daily 60-minute inertial mechanical loading (2.5 G at feet to 1 G at heart) via centrifuge.
Control group underwent instrumentation without centrifugation; physiological monitoring included ECG, blood pressure, pulse oximetry, force plate, and electromyography.

Main Results:

Daily artificial gravity loading demonstrated potential to counteract bed rest deconditioning.
Cardiovascular and musculoskeletal responses were monitored during centrifugation.
Subjective assessments of motion sickness and health were collected.

Conclusions:

The developed centrifuge protocol shows promise as an artificial gravity countermeasure.
Further research is warranted to optimize artificial gravity protocols for spaceflight and terrestrial applications.
This study provides critical data on artificial gravity implementation and its physiological impact.