Table 4.

Statistical Variable Definitions and Abbreviations

SDNN	Standard deviation on the NN intervals (NN=normalized R to R=normalized IBI)
VLF	Power in the VLF bandwidth (0.0033–0.04 Hz)
LFN	Power in the LF bandwidth (0.04–0.15 Hz), in normalized unit
HFN	Power in the HF bandwidth (0.15–0.4 Hz), in normalized unit
LF/HF	Ratio LF/HF
Total Power	Total power in the 0.0033–0.4 Hz bandwidth
AvgMM	Average HR Max–HR Min value
AvgHR	Average heart rate
AvgBR	Average respiration (breathing) rate
AvgTM	Average temperature