A simple measurement technique for the estimation of the dilation of the brachial artery has been developed from a comparison of measurements of pulse timing in a raised arm and a control arm kept at heart level. The artery expands in the raised arm leading to a decrease in blood velocity. An estimate of the dilation of the brachial artery is obtained from the assumption that the flow in the raised arm is unchanged due to the position of the arm. The pulse timing difference measured at similar points in the two arms (index finger or wrist) is due to the dilation of the artery. The square of the radial dilation d is given by the length of the brachial artery divided by the product of the systolic blood velocity in the control arm times the observed pulse timing difference. Measurements were obtained by placing transducers on the index fingers of both hand and the lower leg of the subject. Measurements are recorded at a 1 kHz rate using a laptop computer. Initially, the subject places both hands at heart level. After a period of 1 minute, the right hand is raised at an angle of 45° and supported by a platform. Pulse timing measurements are computed using the two sensors on the hands and the pulse wave velocity is computed using the left hand and leg sensors. Simultaneous measurements of pulse wave velocity are inversely correlated with the pulse timing difference.