Automatic device Fitness Game-Changer Heart LifeTrak rate Training Variability ZOOM LifeTrak ZOOM HRV – Automatic Heart Rate Variability Device is a Game-Changer in Fitness Training &q=exercising+heart+rate With the push of a button ZOOM HRV optically streams continuous heart rate data, measures HRV instantly, monitors physica… Monday, February 13, 2012 Add Comment Edit