1. Physiologic parameter measuring apparatus configured to mitigate effects of a first change in blood vessel dynamics, said apparatus comprising: a non-invasive parameter sensor configured to sense a parameter associated with a blood vessel at a first location on a body of a subject and generate a signal relating thereto; a processor operatively coupled to said sensor; and a computer program configured to be executed by said processor, said computer program comprising a plurality of instructions which are configured to, when executed: process said signal to produce a representation of said measured parameter; passively detect a second change within said signal resulting from said first change in said dynamics; and delay processing of said signal until said second change has substantially subsided.