Many of the studies evaluate the change in HRV with increasing training load (overload).The science around HRV and Overtraining Syndrome is tricky to interpret for several reasons: Overtraining Syndrome is a serious long term problem for athletes. Some Running Watches can record or display HRV, and some have software to use HRV to predict recovery or V̇O 2max.Lower HRV is associated with greater risk of death after heart attacks.HRV is linked to aerobic fitness, with the fittest individuals having the greatest variability, and this can be used to predict V̇O 2max.Therefore, looking at HRV to Heart Rate ratios is important rather than looking at raw HRV values. Generally, HRV is greatest at rest and the variability declines as the heart rate rises.There is evidence that HRV can be used to detect Overtraining Syndrome, but only by comparison with prior HRV data.Resting HRV tends to decline with training stress, but there are wide variations between individuals and there are other factors that can influence HRV on a daily basis.There are various ways of analyzing HRV that provide different values, and these methods have different benefits.HRV can be measured during exercise or at rest.In the context of HRV, this irregularity is a good thing, and lower HRV indicates an increased level of stress. However, the actual time between heartbeats could vary so that some beats occur after 0.8 seconds, and some after 1.2 seconds.
For example, a Heart Rate of 60 BPM is an average of one beat per second. The time between heartbeats varies slightly, even when the average Heart Rate is steady. Heart Rate Variability (HRV) is a measure of the irregularity of the Heart Rate.
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