Apple patents sensor-packed health monitoring headphones with 'head gesture' control [Apple Insider]

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"According to the patent, the fitness monitoring system is cleverly ensconced in a set of headphones, something users commonly wear to listen to music during workouts. By positioning the headset in or near the ear, the embedded activity sensor can pick up temperature, perspiration and heart rate data, among other metrics.
 In addition to skin-based readings, an accelerometer may also be incorporated into the earbud chassis to facilitate the collection of accurate movement data. Some embodiments call for multiple accelerometers, each corresponding to a different axis. "

Apple patents sensor-packed health monitoring headphones with 'head gesture' control