Strain-gauge plethysmography is a non-invasive technique that measures variations in electrical resistance associated with changes in blood volume, recorded through a sensor encircling any cylindrical segment of the body, including the neck. The required hardware is easily transported, is not operator-dependent, and is non-invasive making it ideal to study the modality of brain venous drainage in microgravity.
The aim of the experiments to be carried out on board the ISS is threefold:
1. Study of the cerebral venous return (CVR) in a microgravity environment by measuring changes in neck volume as a function of the postural conditions.
2. Study of the circadian rhythm (CVR chronobiology) by means of the analysis of on-board CVR.
3. Assessment of the processes of physiological adaptation by means of basal spirometry and echo color Doppler sonography.
Five inflight data collections are planned with the possible addition of a sixth data collection. On orbit sessions planned are similar to BDC sessions except for a reduced ultrasound schedule. Plethysmography is planned for the first, fifth, ninth, nineteenth, and twenty-third weeks of flight, while ultrasound is planned only for the first and twenty-third weeks of flight.
This experiment is currently in operations. The results are not yet available.