ISS009-E-13739 (5 July 2004) --- Cosmonaut Gennady I. Padalka, Expedition 9 commander representing Russia�s Federal Space Agency, works with the Cardiocog experiment in the Zvezda Service Module of the International Space Station (ISS). Originally part of Pedro Duque's VC5 "Cervantes" science program, Cardiocog studies changes in the human cardiovascular system in micro-G, expressed in the peripheral arteries, and the vegetative regulation of arterial blood pressure and heart rate.