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Heart Rate Variability Formula:
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Heart Rate Variability (HRV) is a measure of the variation in time between successive heartbeats. It reflects the autonomic nervous system's function and is an important indicator of cardiovascular health and stress resilience.
The calculator uses the standard deviation formula:
Where:
Explanation: The calculator computes the standard deviation of the provided RR intervals, which quantifies the variability in heart rate over the measured period.
Details: HRV is a valuable metric for assessing autonomic nervous system balance, stress levels, recovery status, and overall cardiovascular health. Higher HRV generally indicates better adaptability and health.
Tips: Enter RR intervals as comma-separated values in milliseconds. Ensure you have at least 2-3 intervals for meaningful calculation. Typical RR intervals range from 600-1000ms for resting heart rates.
Q1: What is a normal HRV range?
A: Normal HRV varies by age, gender, and fitness level. Generally, values between 20-100ms are common, with higher values indicating better autonomic function.
Q2: How many RR intervals are needed for accurate HRV calculation?
A: For short-term analysis, 2-5 minutes of data (120-300 intervals) is recommended. For ultra-short-term measurements, at least 10-20 intervals are needed.
Q3: What factors affect HRV?
A: HRV is influenced by age, fitness level, stress, sleep quality, hydration, medications, and various health conditions.
Q4: Can HRV be used for training optimization?
A: Yes, athletes often use HRV to monitor recovery and optimize training loads. Low HRV may indicate inadequate recovery.
Q5: Are there other HRV measurement methods?
A: Yes, besides SDNN (standard deviation), other common measures include RMSSD, pNN50, and frequency domain analysis (LF, HF, LF/HF ratio).