Get a better idea of your general health and physical fitness level with the ECG Analyzer app + Apple Watch ECG.  ECG Analyzer integrates with Apple Health to unleash the greatest power of your Apple Watch ECG, by analyzing and calculating HRV out of your ECG data, one of the best metrics for physical fitness and overall health level. With HRV trends you can learn your health level changes. A up hill trend means a better physical fitness level and a down hill indicates you should pay more attention to your overall health. Things you can do about your ECG data - 1. Measure intervals and voltages on the ECG rhythm waves 2. Calculate HRV (using RMSSD) 3. View Poincaré plot / R-R interval plot 4. HRV trends 5. Generate PDF report with HRV info 6. Send your ECG report to your healthcare provider So what is HRV? HRV is a measure of your autonomic nervous system that is widely considered one of the best objective metrics for physical fitness and determining your body’s readiness to perform. Although HRV manifests as a function of your heart rate, it actually originates from your nervous system. Your autonomic nervous system, which controls the involuntary aspects of your physiology, has two branches, parasympathetic (deactivating) and sympathetic (activating). The parasympathetic branch (often referred to as “rest and digest”) handles inputs from internal organs, like digestion or your fingernails and hair growing. It causes a decrease in heart rate. The sympathetic branch (often called “fight or flight”) reflects responses to things like stress and exercise, and increases your heart rate. Heart rate variability comes from these two competing branches simultaneously sending signals to your heart. If your nervous system is balanced, your heart is constantly being told to beat slower by your parasympathetic system, and beat faster by your sympathetic system. This causes a fluctuation in your heart rate: HRV. Terms of use - http://www.apple.com/legal/itunes/appstore/dev/stdeula