Abstract: Apparatus for measuring a user's heart rate and other physiological parameters derived from two electrodes at least one of which is in contact with the user's head. The second electrode is in contact with the user's skin. A heart rate detection circuit is coupled to the electrodes to detect the user's heart rate as electrical potential difference between the first and second electrodes. The electrodes may be integral with user apparel such as hats, headbands, helmets, eyewear, etc. The electrodes may be integral with headphone speakers in contact with the user's ears. The heart rate detection circuit may be integral with or coupled to an audio source device such as an MP3 player or a portable communication device. The detected heart rate may be presented to the user as audio signals or as visually displayed information. A third electrode may be added to improve the quality of the sensed signals.

Abstract: A system for recording designated physical activity during the period of activity by means of a digital timepiece carried by an athlete or user for subsequent playback after the activity via an audible transmission link to a digital computer for processing, analysis and display.

Abstract: A system for recording designated physical activity during the period of activity by means of a digital timepiece carried by an athlete or user for subsequent playback after the activity via an audible transmission link to a digital computer for processing, analysis and display.