The New York Times-20080124-An MP3 Player That Works in Sync With Your Heartbeat

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An MP3 Player That Works in Sync With Your Heartbeat

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No one knows you as well as your Yamaha Bodibeat. This MP3 player scans your music collection and plays tunes in sync with your heartbeat.

The player works in four modes: workout, fitness, training and a standard music-playing mode. The workout mode automatically matches your music with your heartbeat -- slow down and you might get some smooth jazz; speed up and you get grunge -- while the other two modes play music at a brisk tempo, encouraging you to work harder. It comes with a set of electronic beats or can pull music from your own collection, assuming there are ample upbeat beats available.

The Bodibeat software lets you record runs and plan workouts based on intensity and speed. It includes a pulse and pace sensor for measuring heart rate and distance completed. JOHN BIGGS

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