a) Time-resolved post-occlusive blood flow velocity in the femoral artery of a healthy young subject. The cuff was released at t = 0 and each vertical “spike” represents a systolic peak. The time Ta (arrow) represents the duration of the forward flow during hyperemia due to reduction in the vascular resistance. b) Flow rate computed from the velocity data averaged over a 2-second sliding window. The dashed line represents the baseline flow rate.