Which of the following statements about heart rate variability (HRV) is NOT true?
A. HRV decreases in response to regular aerobic exercise training.
B. HRV refers to the time interval between heart beats.
C. Epidemiological studies suggest that a low HRV is an excellent predictor of mortality in some patient populations.
D. HRV is influenced by the balance between the parasympathetic nervous system and the sympathetic nervous system.
Answer: A
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