The pulse you feel is really blood forcing its way through an artery
. The feel of a pulse can be attributed to blood pressures. Think of the blood pressure as the force behind what it takes to move that blood. Blood pressure is actually controlled by many factors like: The elasticity of the blood vessels, the amount of blood volume, the diameter of the blood vessels, the force and volume that the heart is pumping, the amount of blood vessels in the body. The latter will increase if you gain weight. In general the greater the blood pressure the more work the heart do to supply that blood.