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Low-Frequency Power Ratio

Meaning

The Low-Frequency Power Ratio, often expressed as the LF/HF ratio (Low Frequency to High Frequency), is a critical metric derived from the frequency domain analysis of Heart Rate Variability (HRV). This ratio is widely interpreted in clinical physiology as an index of sympathovagal balance, reflecting the relative contribution of the sympathetic and parasympathetic nervous systems to cardiac regulation. A higher ratio generally indicates a dominance of sympathetic tone, suggesting a state of heightened stress, fight-or-flight activation, or reduced parasympathetic withdrawal capacity. Monitoring this ratio is essential for assessing allostatic load and its impact on hormonal health.