What is heart rate variability? How to measure HRV and what it means

A higher HRV may indicate better physical fitness and resilience to stress, while a lower HRV is associated with anxiety and ...
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Determining Axis

The axis of the ECG is the major direction of the overall electrical activity of the heart. It can be normal, leftward (left axis deviation, or LAD), rightward (right axis deviation, or RAD) or ...