An apparatus for detecting human physiological or contextual information includes a flexible section(s), a housing removably attached thereto, one or more sensors and a processor. The apparatus may include one of several structures for removably attaching the housing to the flexible section(s) and may have adjustable operating parameters. An alternate apparatus measures heat flux and includes a housing, a known resistivity base member, a processing unit and two temperature measuring devices attached to the base member, one in thermal communication with the body through a thermal energy communicator and the other in thermal communication with the ambient environment. A further alternate apparatus includes a housing having an adhesive material on a surface thereof for removably attaching the housing to the body. A further alternate apparatus includes a housing having an inner surface having a concave shape in a first direction and convex shape in a second direction substantially perpendicular thereto. An apparatus for detecting heart related parameters of the wearer includes an acoustic-based non-ECG heart parameter sensor and one or more filtering sensors for generating a signal related to the non-heart related motion of the body, the second signal being used to subtract an acoustic component generated from non-heart related motion of the body from the non-ECG heart parameter sensors signal to generate a third signal used to generate the heart related parameters of the wearer.
