Abstract: A method, apparatus, computer program product and system are provided to determine the position of at least a portion of the body of a subject, thereby providing for motion estimation and/or body posture detection. In regards to a method, information is received regarding a signal that propagated through a capacitively-coupled intra body communication channel in a body from a first node to a second node. The method also evaluates the information regarding the signal in order to determine information regarding a position of at least a portion of the body. By evaluating the information, the method identifies different positions of at least the portion of the body based upon the signal that propagated through the capacitively-coupled intra body communication channel that varies in a manner attributable to changes in capacitance between the first and second nodes.

Abstract: A body impedance measurement apparatus and method as well as the transmitter and receiver of a body impedance measurement apparatus are provided. A body impedance measurement apparatus includes transmitter means configured to provide (62) an amplitude modulated signal via a transmitting electrode means (10) to a body to which the transmitting electrode means (10) is applied. The body impedance measurement apparatus also includes receiver means for receiving (64) signals, responsive to the amplitude modulated signal, via a receiving electrode means (12) that is configured to be applied to the body and to be remote from the transmitting electrode means (10) so as to be in wireless communication with the transmitting electrode means (10) via the body. The receiver means is configured to process (68) the received signals to determine a measure of the body impedance.