A weight-bearing device comprising: a weight-bearing surface configured to bear the weight of a subject; a first sensor module disposed in the device, the first sensor module configured to measure information about pulse waves propagating through blood in the subject, the subject located in contact with the weight-bearing surface; a second sensor module disposed in the device, the second sensor module configured to measure information about a motion of the subject; and a processing device configured to: receive a first dataset representing time-varying information about at least one pulse wave propagating through blood in the subject, wherein the time-varying information about the at least one pulse wave is measured using the first sensor module; receive a second dataset representing information about a time-varying motion of the subject, wherein the information about the time-varying motion is measured using the second sensor module; identify a first point in the first dataset, the first point representing an arrival time of the pulse wave at a first body part of the subject; identify a second point in the second dataset, the second point representing an earlier time at which the pulse wave traverses a second body part of the subject; and compute a pulse transit time (PTT) as a difference between the first and second points, the PTT representing a time taken by the pulse wave to travel from the second body part to the first body part of the subject.
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