HRV analysis is a powerful, accurate, reliable, and reproducible physiological assessment.
It is found that lowered HRV is associated with aging, decreased autonomic activity, hormonal tonus, specific types of autonomic neuropathies (e.g. diabetic neuropathy) and increased risk of sudden cardiac death after acute heart attack.
Research indicates that depression, panic disorders and anxiety have a negative impact on autonomic function, typically causing depletion of the parasympathetic tonus. On the other hand, an increased sympathetic tonus is associated with a lowered threshold for ventricular fibrillation. These two factors could explain why such autonomic imbalance caused by significant mineral difficiency and toxic burden increases the risk of heart attack followed by sudden cardiac death.
Aside from that, there are multiple studies indicating that HRV is quite useful as a way to assess the bodies response to medication and other inteventions. The side effects of pharmaceutical interventions have been shown to reduce heart rate variability.