Patent ID: 8062183

Claim:
A stationary bicycle comprising a frame, a handlebar, a saddle, and a sensing apparatus, the sensing apparatus comprising a housing that supports a source of emitted radiation and a detector of radiation of the same wavelength as that emitted by the source, fixing means for fixing the housing to the stationary bicycle such that radiation is emitted towards a region of space that can be occupied by a part of a body of a user of the stationary bicycle and selectively transmitted on to the detector depending on whether a part of a user's body is located within the space, a processor which measures at least one property of the radiation from the source that is passed to the detector and from the measured property produces an output signal indicative of the proximity of the user relative to the device within that space and further in which the sensor directs radiation into a region or a space that is upward and reward from the handlebar to produce an output signal indicative of the position of a torso of the user relative to the handlebar.