Key result
Beat-to-beat heart rate fluctuations, specifically their frequency and amplitude, indicate the modulation of underlying cardiac autonomic control systems.
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Design
Review
HRV may inform autonomic assessment in select patients; confirms physiology but leaves open prospective clinical validation.
What is most intriguing about heart rate (HR) variability is that there is so much of it. HR is constantly responding both rapidly and slowly to various physiological perturbations. We now understand that the frequency and amplitude of these HR fluctuations are indicative of the autonomic control systems underlying the response.
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JP Saul (1990) studied this question. Beat-to-beat heart rate fluctuations, specifically their frequency and amplitude, indicate the modulation of underlying cardiac autonomic control systems.
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