In this study, funded by the European Union through the project STAMAS, we intend to evaluate whether leg physical exercises can lead to a displacement of blood towards the lower extremities, therefore ameliorating the upward fluid shift caused by weightlessness. More generally, we aim to investigate the short-term response of the cardiovascular system to leg exercises in microgravity-like conditions. After a clear understanding of these phenomena we will develop a controller that, by monitoring the physiological stare of a subject, will compute the appropriate exercise regime to stabilize his/her cardiovascular parameters to desired safe values. Our contribution will provide a better understanding of the cardiovascular system, and will delineate the physiological ground for the development of novel countermeasure devices against the cardiovascular deconditioning during space flight based on continuous leg exercises.