1. What is R-R Interval?

The R-R interval is the time between successive R waves of the QRS complex on the electrocardiogram (ECG). It represents the time between heartbeats and is used to calculate heart rate variability and assess cardiac rhythm.

2. How Does the Calculator Work?

The calculator uses the R-R interval formula:

Where:

• \( HR \) — Heart rate in beats per minute (bpm)

Explanation: The formula converts heart rate from beats per minute to the time interval between beats in seconds.

3. Importance of R-R Interval Calculation

Details: R-R interval measurement is essential for assessing heart rate variability, diagnosing arrhythmias, and evaluating autonomic nervous system function. It's particularly important in cardiology and sports medicine.

4. Using the Calculator

Tips: Enter heart rate in beats per minute (bpm). The value must be greater than 0. Normal resting heart rate ranges from 60-100 bpm in adults.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal R-R interval?
A: For a heart rate of 60 bpm, the R-R interval is 1.0 second. For 100 bpm, it's 0.6 seconds. Normal varies with heart rate.

Q2: How is R-R interval related to heart rate variability?
A: Heart rate variability is measured by analyzing the variation in successive R-R intervals. Greater variability generally indicates better cardiovascular health.

Q3: Can R-R interval help detect arrhythmias?
A: Yes, irregular R-R intervals can indicate various arrhythmias such as atrial fibrillation or premature ventricular contractions.

Q4: How is R-R interval measured on an ECG?
A: On an ECG, the R-R interval is measured from the peak of one R wave to the peak of the next R wave.

Q5: Does R-R interval change with breathing?
A: Yes, normally R-R interval slightly increases during inspiration and decreases during expiration due to respiratory sinus arrhythmia.