Heart rate variability really does not mean variability in heart rate (such as is shown on the graph linked) it is more at the 50-100ms level in change in timin

Heart rate variability really does not mean variability in heart rate (such as is shown on the graph linked) it is more at the 50-100ms level in change in timing between hear beats. The graph does seem to show a reduction in RHR but does not address HRV (as I understand it)