Table 2.

Summary of RR interval and HRV response to autonomic blockade and recovery time

	β-Blockade Effect	Parasympathetic Blockade Effect	Opposite β-Blockade and Parasympathetic Blockade Effects	Time Effect	Time Effect Consistent with Blockade
RR	Yes ↑	Yes ↓	Yes	Yes ↑	Yes
RMS	No	Yes ↓	N/A	Yes ↑	Yes
rMSSD	Yes ↑	Yes ↓	Yes	No	N/A
sqrtLF	No	Yes ↓	N/A	Yes ↑	Yes
sqrtHF	No	Yes ↓	N/A	Yes ↑	Yes
sqrtTOTAL	No	Yes ↓	N/A	Yes ↑	Yes
LF/HF	No	No	N/A	Yes ↑	N/A

For the measures that were positively affected by autonomic blockade or time, the up arrows signify an increase in the measure and the down arrows signify a decrease. N/A, not applicable.