“…This may be due to impaired sympathovagal balance and decreased heart rate variability in healthy subjects due to smoking. [19] Values of mean LF/HF ratio in the present study are in agreement with the values of Taralov et al [31] (2015), Doss et al [11] (2016), Saini et al [23] (2016). This suggest increased sympathetic activity and decrease in parasympathetic activity.…”