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Nordic Semiconductor Bluetooth Smart activity monitor extends tracking to physiological data including fatigue and mood

Nordic Semiconductor Bluetooth Smart activity monitor extends tracking to physiological data including fatigue and mood

The 37 Light comes in a wristband form factor and as well as using Nordic Semiconductor Bluetooth Smart technology to wirelessly monitor physical activity also reports a range of health data including blood pressure, resting heart rate, respiratory frequency, fatigue, and even the user's mood


Ultra low power (ULP) RF specialist Nordic Semiconductor ASA (OSE: NOD) today announces that 37 Body, a Shanghai, China-based developer of health and wellness wearable devices, has selected Nordic’s multiple award-winning nRF51822 System-on-Chip (SoC) for its new 37 Light body monitor wristband. The nRF51822 SoC provides Bluetooth® Smart wireless connectivity to both iOS and Android-compatible Bluetooth Smart Ready devices.


Unlike many activity monitors, 37 Body says the 37 Light wristband not only counts the wearer's time at rest, number of steps, and other physical activity, but also simultaneously accurately tracks and records a range of physiological data including blood pressure, resting heart rate, respiratory frequency, degree of fatigue, and even the wearer’s ‘mood’, using the principle of heart rate variability (HRV).


Heart rate is measured by counting the number of beats over time to establish a mean rate in beats per minute. This is, for example, a useful measure of how hard a person is exercising. HRV takes heart analysis a stage further by measuring variability in the time between heartbeats. At any given time, two people can have the same heart rate but widely different variability. Medical research has established that the degree of variability is a good indicator of a number of physiological conditions including levels of stress and fatigue.


The highly accurate 37 Light wristband conforms to Association for the Advancement of Medical Instrumentation (AAMI) international standards for accurate measurement, measuring and processing some 100 million data inputs simultaneously while detecting minute optical changes within 30 milliseconds. The nRF51822 SoC allows captured data to be wirelessly communicated to an accompanying iOS 7 or Android 4.3 and above smartphone or tablet app, where the user can see and interpret their results.


Manufactured from an aesthetic and durable thermoplastic silicone, the wristband weighs only 21g and is powered by a 157mAh battery, allowing the device to operate for up to five days between recharge in standard operation, thanks in part to the ultra low power consumption of the nRF51822.


Nordic’s nRF51822 is a powerful and flexible multiprotocol SoC ideally suited for Bluetooth Smart and 2.4GHz ultra low-power wireless applications. The nRF51822 is built around a 32-bit ARM® Cortex™ M0 CPU with 256kB/128kB flash and 32kB/16kB RAM. The embedded 2.4GHz transceiver is fully compliant with Bluetooth v4.2, the latest Bluetooth Smart specification.


“The nRF51822 provides the main processing platform for our products. We chose it because of the chip’s excellent power consumption, but also its high performance and future scalability,” says Steven Wang, 37 Body Founder and CEO.


“The 37 Light wristband can provide a comprehensive wellness testing service that does not intrude on the user’s daily life,” continues Wang. “We believe that this kind of technology, which measures a number of parameters without the user being directly involved as an observer is the development trend of the future.”


“37 Body has come up with a novel enhancement to the wireless wristband which increases the devices’ usefulness for people who are interested in monitoring a wider range of physiological factors than is typically possible,” says Geir Langeland. “The company’s interesting new product clearly demonstrates the key strengths of the nRF51822: lots of processing power, low current consumption, and compact dimensions.”



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