Fitness monitor tracks body temperature

19 November 2013

The Spree Fitness Monitor combines the measurement of motion, heart-rate, and temperature into a single monitoring device.
The Spree Fitness Monitor combines the measurement of motion, heart-rate, and temperature into a single monitoring device.

The Spree Fitness Monitor combines the measurement of motion, heart-rate, and temperature into a single monitoring device.

Nordic Semiconductor announces that U.S. startup Hothead Technologies has specified Nordic's nRF8001 Connectivity chip to provide Bluetooth low energy wireless comms in the world's first fitness monitor to track body temperature in addition to conventional movement (time, speed, and distance) and heart-rate.

Various studies have shown that hyperthermia (body temperature greatly above normal = 37.5ºC or over, as opposed to hypothermia which is body temperature greatly below normal = less than 35.0ºC) can adversely affect both physical performance and reduced the benefits of exercise.
The Spree Fitness Monitor is the world's first product to recognise this fact and in conjunction with a free Spree app running on any Bluetooth v4.0 (which includes Bluetooth low energy as a hallmark feature) enabled smartphone or tablet enables users to monitor their optimal temperature-movement-heart-rate workout zone in real time.

In operation, all measurement technologies are integrated into a small 'Performance Optimisation Device' or 'POD' that fits securely into a water-resistant silicone elastic headband that the end user wears (and indeed additionally benefits from functioning) like a traditional sweatband.

All three sets of biometric information (body temperature, movement, and heart-rate) are then obtained from the forehead via a thermistor (an electronics device whose resistance precisely varies in response to thermal change) for temperature, a 'photoplethysmograph' for heart-rate (an optical blood volume measurement technology employed in most emergency room pulse oximeters), and a triple-axis accelerometer for motion.


This, claims Hothead Technology, makes the Spree the most advanced personal fitness monitor in the world and far more accurate than existing wrist or foot worn devices, without the discomfort (especially for women) of heart-rate chest straps.


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