In your feature on vagal nerve stimulation, HeartMath’s Inner Balance Sensor was described and, apparently, recommended (13 July, p 46). I bought it. Two weeks later, Feedback looked at the fruitloopy ...
The HeartMath Inner Balance Sensor and Tinke by Zensorium are devices that digitally monitor heart rate and breathing patterns. WSJ's Katherine Boehret says they're ideal tools for busy people to stay ...
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