TY - JOUR T1 - Heart Rate Variability: An Old Metric with New Meaning in the Era of using mHealth Technologies for Health and Exercise Training Guidance. Part One: Physiology and Methods AU - Singh, Nikhil AU - Moneghetti, Kegan James AU - Christle, Jeffrey Wilcox AU - Hadley, David AU - Plews, Daniel AU - Froelicher, Victor DO - 10.15420/aer.2018.27.2 UR - https://doi.org/10.15420/aer.2018.27.2 JO - Arrhythmia & Electrophysiology Review 2018;7(3):193–8. Y1 - 2018 PB - Radcliffe Cardiology ER -