The application relates to apparatus, methods and computer programs for determining pulse wave velocity. The apparatus comprises means for: receiving a first ballistocardiograph signal indicative of a pulse wave travelling in a first direction at a first time, the pulse wave having a pulse velocity and receiving a second ballistocardiograph signal indicative of the pulse wave travelling in a second direction at a second time, wherein the second direction is, at least partially, perpendicular to the first direction. The means are also for determining the pulse wave velocity based one the first ballistocardiograph signal and the second ballistocardiograph signal.
