HIGHLIGHTS
SUMMARY
The ANS is commonly divided into the parasympathetic (PNS) and sympathetic nervous systems (SNS), where the PNS is generally associated with resting and relaxation (e_g, decreasing heart rate; HR) while the SNS is associated with "fight-or-flight" responses and generally higher arousal and attention (e_g, increasing HR). HRV measures derived from the frequency domain include the power of the low-frequency band (0.04-0.15 Hz; HRV-LF), the power of the highfrequency band (0.15-0.40 Hz; HRV-HF), and the ratio of low- to high-frequency power (LF/HF . . .
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