Effects of Moxa (Folium Artemisiae argyi) Smoke Exposure on Heart Rate and Heart Rate Variability in Healthy Young Adults: A Randomized, Controlled Human Study

Table 1

HRV parameters used in this trial.

Variable	Units	Description
Time-domain; parameters
SDNN	msec	the standard deviation of all NN intervals, an estimate of overall variability
rMSSD	msec	the square root of the mean of the squared differences between adjacent NN intervals, an estimate of the short-term components of variability
pNN50	%	the proportion derived by dividing NN50 (the number of interval differences of successive normal-to-normal intervals greater than 50 ms) count by the total number of normal-to-normal intervals
Frequency- domain; parameters
TP	msec^2	total power, frequency range <0.4 Hz
HF	msec^2	power in the high-frequency range (0.15–0.4 Hz), considered to be mediated mainly by vagal activity
LF	msec^2	power in the low-frequency range (0.04–0.15 Hz), suggested to be mediated by both sympathetic and parasympathetic activities
LF/HF	Ratio	an indicator of the balance of the sympathetic and parasympathetic systems