How can a bracelet track your heart rate?


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  • American Heart Association. "Target Heart Rates." Jan. 8, 2015. (March 29, 2015) http://www.heart.org/HEARTORG/GettingHealthy/PhysicalActivity/FitnessBasics/Target-Heart-Rates_UCM_434341_Article.jsp
  • National Institutes of Health — National Heart, Lung, and Blood Institute. "What is an Electrocardiogram?" Oct. 1, 2010. (March 29, 2015) http://www.nhlbi.nih.gov/health/health-topics/topics/ekg/
  • Profis, Sharon. "Do Wristband Heart Trackers Actually Work? A Checkup." CNET. May 22, 2014. (March 29, 2015) http://www.cnet.com/news/how-accurate-are-wristband-heart-rate-monitors/
  • Zimmermann, Kim Ann. "Heart Rate Monitors: How They Work." Live Science. Dec. 27, 2013. (March 29, 2015) http://www.livescience.com/42220-heart-rate-monitors.html