 Arterial stiffness will be determined using a Sphygmocor CPVH pulse wave applanation tonomoter Atcor Medical. This device measures arterial pulse waves non-invasively through the skin. By matching pulse wave arrival with heart beats through a standard ECG tracing and measuring the distance between points we can calculate travel time or velocity. We will also use this same device to analyze the shape of the pulse wave, which will give us information about reflected pulse waves and thus the stiffness of the arterial tree. 