The invention relates to a deformable support element for use in a bed system, and to a bed system comprising the support elements. The bed system is suited in particular for use in the prevention of the development of decubitus by recumbent patients. The support element according to the invention consists of a support plate, flexible edge elements connected at each end to the support plate allowing for a directed movement of the end of the support plate out of an unloaded position, and one or more actuators beneath the support plate for deforming the support plate. The invention is advantageously characterized in that the support plate of the support element can take on a straight shape by the actuation of the actuator or actuators or can be deformed into an undulated shape or into a movement that is directed upward or downward.