Rene Leriche's phenomenally based image of health serves to frame a concern regarding the integration of physiological sensor technologies into the consumer market. However, this analysis is not so concerned with the body in a state of illness, when normal life is interrupted, but at the point when physiological instrumentation is diffused into what Don Ihde refers to as the "technological texture' (Ihde: 1979) of our day-to-day environment. It is this possibility that demands an enquiry into what may happen when instrumentation gives the body a voice.