Four Heart Rate Variability Myths

High-frequency power at normal breathing rates can show whether HRV biofeedback has increased vagal tone.
True
False
The LF/HF ratio is controversial because the sympathetic branch does not generally contribute to short-term HRV.
True
False
A healthy heartbeat should resemble a metronome.
True
False
Exhaling longer than you inhale can increase most HRV measurements.
True
False
HRV biofeedback training can immediately increase respiratory sinus arrhythmia 4-10 times compared with a resting baseline.
True
False
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